2011 Commercial Water Heating Solutions
Introducing Bosch Therm, our most advanced line of tankless water heaters for commercial applications.

About the Bosch Group

The Bosch Group has been a leading global supplier of technology and services in the areas of Automotive, Industrial Technology, Consumer Goods and Building Technology for over 100 years. The company was founded in Stuttgart, Germany in 1886 and today has more than 300 subsidiaries in over 150 countries. Every Bosch product is built with one goal in mind; to enhance quality of life by providing innovative technological solutions. Bosch is highly regarded for its development of automotive braking and steering safety systems (ABS) which have been improving automotive performance for over 30 years and, helping reduce the number of accidents on North Americas roads and highways. Environmental stewardship inspires and drives Bosch product development. Bosch is a leader in the creation of next-generation technologies that deliver improved performance and efficiency while conserving natural resources. In the area of sustainable mobility, were helping reduce the fuel consumption and CO2 emissions of new vehicles. Energy efficiency and environmental protection are also shaping our
Industrial Technology, Consumer Goods and Building Technology products. Green technologies, such as gas tankless water heaters, heat pump electric water heaters, solar thermal systems, photovoltaics, wind power and geothermal heat pumps are perhaps the best examples of smart technologies growing in demand and shaping the future of Bosch.
Bosch Thermotechnology in North America
Bosch Thermotechnology is a leading source of high quality water heating and comfort heating systems. In particular, the company offers Bosch tankless, point-ofuse water heaters, Bosch solar thermal systems, Buderus floor-standing and wall-hung boilers, FHP geothermal heat pumps as well as controls and accessories for every product line. As illustrated in this catalog, and at www.bosch-climate.us, Bosch Thermotechnology is committed to reinventing energy efficiency by offering smart products that work together as integrated systems which enhance quality of life in an ultra-efficient and environmentally-friendly manner.

Contents

4 9 17 23 About the Bosch Group Why Bosch is your best choice Commercial product guide 5 Product comparison guide 6 New! Bosch Therm 7 Point-of-use solutions 8 Application and feature icons key Commercial gas tankless water heaters 12 Bosch Therm condensing gas tankless 13 Bosch Therm non condensing gas tankless 14 Recommended commercial systems 16 Tankless water heater accessories Electric tankless and point-of-use solutions 18 Powerstream Pro 17 & 27 series 19 Powerstream Pro 1-12 compact series 20 Ariston Pro GL2.5Ti, GL4Ti, & GL8Ti New for 2011! Bosch Compress heat pump electric water heater Commercial installations Bosch system integration
3 | 2011 Commercial water heating solutions
Why Bosch is the best choice for your business
Bosch is a name you know and trust
Everyone knows and respects Bosch for its unsurpassed commitment to quality, innovation and value within a broad range of products including: automotive parts, power tools, home appliances and tankless water heaters. Bosch is highly recommended by professional contractors and is a brand that loyal customers refer to their friends and family.
Your single source for hot water systems
For restaurants, hotels, schools, spas and car-washes, you can trust that Bosch has a commercial water heating solution that is perfect for every application. Best of all, Bosch products are designed to seamlessly work together which means you can integrate Bosch products to build a reliable customized system.
Bosch exclusive: safety and precision controls
Bosch is the only major tankless water heater manufacturer to offer a built-in digital control panel with the ability to adjust water output temperatures in precise 2F increments across the entire temperature range. This precision control is especially important in public facilities, schools, hospitals and nursing homes.

WA NH H

Example:A sports complex in Miami, Florida is considering ten C 1210 ESC models linked in a cascade. The ground water temperature in Miami is 77F which means this facility can run up to 50 showers at the same time.

Inlet Temp. (F)

Gas Tankless 67

Summer

Winter

C 1210 ESC

9.8 GPM

8.8 GPM

8.0 GPM

7.3 GPM

6.7 GPM

6.2 GPM

5.8 GPM

5.4 GPM

5.1 GPM

C 1050 ES

8.5 GPM

7.6 GPM

6.9 GPM

6.3 GPM

5.0 GPM

4.7 GPM

4.4 GPM

940 ES/ESO

7.7 GPM

5.7 GPM

5.2 GPM

4.9 GPM

4.5 GPM

4.2 GPM

4.0 GPM

830 ES

6.0 GPM

4.6 GPM

3.7 GPM

3.5 GPM

660 EF/EFO

4.8 GPM

3.4 GPM

3.2 GPM

3.0 GPM

2.8 GPM

Electric Tankless

RP 27 PT

4.3 GPM

3.8 GPM

2.9 GPM

2.7 GPM

2.5 GPM

2.3 GPM

2.2 GPM

RP 17 PT

2.0 GPM

1.9 GPM

1.7 GPM

1.6 GPM

1.5 GPM

1.4 GPM

Simultaneous Showers

Sink Faucet

Calculations based on 120F Set Point temperature, 107F shower temperature, 2.5 GPM showerhead flow rate, 1.5 GPM sink flow rate, adequate water pressure and gas supply. Variation from these parameters may alter actual performance. GPM shown is the hot water flow rate at 120F Set Point temperature.
6 | 2011 Commercial water heating solutions
New! Bosch Therm gas tankless water heaters
Introducing Bosch Therm. Our newest line of tankless water heaters. This expanded and advanced line includes efficient condensing and non-condensing tankless water heaters with more compact models and greater installation versatility - to satisfy all your commercial applications.

Commercial Series

Model/Part Number Applications Condensing / Non Max. Input Min. Input Thermal Efficiency Capacity @ 35F Rise Capacity @ 55F Rise Energy Factor Activation Flow Rate Temp Range (F) Temp Range with High Temp Kit Installation Options Altitude Tested Venting Options Vent Maximum Run Water Pressure Range Water Connections Min. NG Pressure Gas Connection Dimensions Weight (Lbs) Heat Exchanger Warranty All Other Parts
C 1210 ESC NG / C 1210 ESC LP

940 ES NG / 940 ES LP

940 ESO NG / 940 ESO LP

830 ES NG / 830 ES LP

660 EF NG / 660 EF LP

660 EFO NG / 660 EFO LP

Commercial Condensing 225,000 25,000 Up to 98% 12.1 7.7 N/A 0.5 GPM 100-180 N/A Indoor or Outdoor* 8,000 ft.
PVC, CPVC, ABS, Stainless Steel
Commercial Condensing 199,000 19,900 92% 10.5 6.7.92 0.5 GPM 100-140 100-184 Indoor or Outdoor* 8,000 ft.
Commercial Non Condensing 199,000 19,900 83% 9.4 6.0.83 0.5 GPM 100-140 100-184 Indoor 8,000 ft.
Category lll Stainless Steel
Commercial Non Condensing 199,000 19,900 83% 9.4 6.0.83 0.5 GPM 100-140 100-184 Outdoor 8,000 ft.

N/A N/A

Commercial Non Condensing 175,000 19,900 83% 8.3 5.3.83 0.5 GPM 100-140 100-184 Indoor or Outdoor* 8,000 ft.
Commercial Non Condensing 140,000 20,000.83% 6.6 4.2.82 0.5 GPM 100 - 160 N/A Indoor 4,500 ft.
Commercial Non Condensing 140,000 20,000.83% 6.6 4.2.82 0.5 GPM 100 - 160 N/A Outdoor 4,500 ft.
63' 30 - 150 psi " NPT 3.5" WC " NPT 17.875 x 30.5 x 11.5 Years 5 Years
63' 30 - 150 psi " NPT 3.5" WC " NPT 17.875 x 30.5 x 11.2 Years 5 Years
61.25' 30 - 150 psi " NPT 3.5" WC " NPT 17.875 x 30.5 x 11.2 Years 5 Years
45' 30 - 150 psi " NPT 4" WC " NPT 13.8 x 20.5 x 6.2 Years 5 Years
N/A 30 - 150 psi " NPT 4" WC " NPT 13.8 x 20.5 x 6.2 Years 5 Years
30 - 150 psi " NPT 3.5" WC " NPT 17.875 x 35 x 11.2 Years 5 Years

ICON KEY:

For additional product information and interactive sizing tools visit www.bosch-climate.us * Outdoor installations require optional outdoor kit. 35F capacity on C 1210 ESC and C 1050 ES models is based on installation with a mixing valve to overcome typical pressure loss through the water heater and system. **Icon applies only to the C 1210 ESC models. ***Energy Star icon does not apply to C 1210 ESC models
Point-of-use solutions deliver hot water virtually anywhere
These electric compact tankless and mini-tank water heaters are perfect solutions for a wide range of commercial applications. Ideal for employee breakrooms, public restrooms, janitor closets, salons, medical facilities, veterinary offices and anywhere else you need hot water directly at the point-of-use. These products are also smart for use as a supplemental source for high-flow fixtures or recirculation systems.

ASME CERTIFIED ASME certified heat exchanger.
9 | 2011 Commercial water heating solutions
New! Bosch Therm commercial gas tankless energy efficient water heaters
www.bosch-climate.us | 10
The benefits of going tankless
Endless hot water on-demand
Bosch tankless water heaters work on-demand to produce hot water when needed, for as long as needed. There is no storage tank, so you never have to worry about running out of hot water or waiting for the tank to recover, even during peak use.
Saves up to 50% on water heating costs
A tank style hot water heater keeps water hot 24 hours a day, whether it is needed or not. Bosch tankless produces hot water only when needed, cutting out needless energy consumption and therefore reducing water heating costs by up to 50%.

Space saving technology

A typical tank water heater requires up to 13 sq. ft. of space. If the price per sq. ft. of real estate in your area is $150, thats almost $2,000 worth of space to be re-purposed. Tankless water heaters are compact and can install virtually anywhere - even outdoors.

4sq. ft.

9sq. ft.

0sq. ft.

13sq. ft.
Reduces greenhouse gasses
The EPA identified NOx as a main greenhouse gas contributing to acid rain, respiratory problems and global warming. Boschs condensing tankless models use an exclusive pre-mix combustion process which achieves up to 98% thermal efficiency and reduces NOx emissions ahead of 2012 SCAQMD (14ng/j) regulations.

Max Exhaust 150 F

Bosch Therm gas water heater
Compact design mounts on wall. Copper and aluminum heat exchanger rapidly transfers the heat to the water. Patented, fully modulating burner design generates endless hot water. On-demand technology uses gas only when you produce hot water.
Gas storage tank water heaters
Stored water loses on average, 20% of its heat up the flue and through sidewalls. Cycles on and off 24 hours a day, seven days a week. Mineral build-up leads to tank leaks and greater inefficiency. Small burner cant keep up when demand is high.
CONDENSING HEAT EXCHANGER

COMBUSTION GAS PRIMARY HEAT EXCHANGER

HOT WATER

COLD WATER
11 | 2011 Commercial water heating solutions
Key benefits to consider Provides endless hot water on-demand? Compact, easy access and 100% serviceable parts? Built-in digital control panel with precise 2F temperature increments? Maintains efficiency over the life of the product? Reduces opportunity for bacteria growth Fully modulating vertical burner that works on demand only? How much heat and energy is wasted in the exhaust? Estimated to last 20+ Years?
Bosch Therm tankless Yes Yes Yes Yes Yes. There is minimal standing water to grow bacteria Yes. A Bosch exclusive Bosch dual heat exchangers minimize waste and optimize efficiency - up to 98% Yes
Gas storage tank water heater No No. Tanks are usually just replaced No. High to low setting No. Sediment builds-up inside the tank with each use No. Stored warm water mixes with sediment and is a breeding ground for bacteria No. Uses a single burner that operates with or without hot water demand Heat rises and energy is wasted through the flue at around 78% efficiency No. Replace every 6-12 years
Bosch condensing tankless water heaters are engineered to operate at up to 98% efficiency when North American hot water demands are most common.
The Bosch C 1210 ESC and C 1050 ES gas tankless water heaters are ultra efficient fully condensing water heaters. Unlike traditional non-condensing water heaters, a condensing unit captures latent heat from condensation of the exhaust gas and uses it to preheat the incoming cold water, making Bosch condensing tankless water heaters 10% more efficient than a traditional tankless water heater. As seen on the chart below, this smart technology ensures maximum performance and energy efficiency during normal usage. This is a critical difference in Bosch technology and something we think you should understand because some tankless products advertise high efficiencies based on less common flow situations. With Bosch you know exactly what you are buying.
Benchmark - efficiency results

Efficiency %

90% of hot water draws and 75% of total water usage occur in this area Bosch Tankless Other Tankless

*NON-CONDENSING vent configurations
Horizontal twin pipe termination Vertical twin pipe termination Concentric venting through the wall

12"

Attention Bosch Contractors: *For more venting options and installation diagrams, download individual Product Manuals and Applications Manual at www.bosch-climate.us
www.bosch-climate.us | 14
Recommended commercial systems
Cascade up to 24 units to satisfy jobs of all sizes
Most Bosch Therm commercial models can be linked together to achieve higher flow rates than with single units. A 24-unit cascade using our Bosch Therm Condensing C 1210 ESC for example, can deliver an incredible 290.4 gallons per minute.
Bosch Therm 940 ES, C 1050 ES, C 1210 ESC
Cascading with electric tank for recirculation
Let the built-in functionality of the Bosch Commercial heaters manage your hot water load. A live storage tank and small circulator
Tankless link hot cold hot cold Tankless link hot cold Tankless link hot cold
pump are all that is needed to handle even your most varied demands. The perfect one pump solution for truly instant hot water.

cold Outlet hot Inlet

Note: Drawing not to scale
Domestic hot water recirculation return line

Ariston GL8Ti

Cold water supply

Advanced tank loading

Multi-pump driven high output system with thermostatic and time controls. Expand this system by increasing the quantity of heaters and/or storage capacity.
Note: Drawing not to scale.
15 | 2011 Commercial water heating solutions
Commercial kitchen with live storage
This time and temperature controlled design allows instant hot water that never runs out - even in the busiest kitchens. Adjust the size of the live storage capacity for various dishwasher needs. An efficient and proven solution that works perfectly under heavy peak load as it does during prep hours.
Dishwasher with heating element Y-strainer Dish sprayer Sink
Note: Drawing not to scale. Cold water piping to fixtures not shown for clarity purposes.

Solar tank loading

Let the sun do some work with renewable benefits. Even if the sun cant heat your total hot water load, youll still have hundreds of gallons per hour backing it up with this design. Three areas of flexibility or expansion: number of solar collectors, tankless units and size of storage.
Solar pump station Solar controller Twin tube

Collector sensor

Domestic hot water
Thermostatic valve Setpoint 120oF
Aquastat or tankless sensor
Aquastat or tankless sensor Hot water recirculation return line DHW recirculation pump

www.bosch-climate.us | 16
Tankless water heater available accessories
Wireless Remote Outdoor Kit Concentric Termination Kit Intelligent Cascading Kit High Temperature Kit

Available Accessories

Part # ESHCK 196016 L2594 ES VVT 4TWHVK3SII BTOK TSTAT196061 JM-2KIT ES ISO KIT 7709003956 PTPCES 7709003963 2SVSWB03 Description Concentric vent/air intake kit stainless steel Concentric termination kit - PVC* Exhaust/intake bird screen - PVC Vertical vent kit Horizontal vent kit Outdoor kit for Therm Wireless remote control Intelligent cascading kit External water filter High temperature kit PVC Condensing drain tee Condensate neutralization cartridge kit Isolation valve kit with PRV Pipe cover Pipe cover Recess box Recess box Remote controller (US) Remote controller (CAN) 10' Length RC cord 26' Length RC cord Junction box (unit cover for outdoor) 3" Vent adaptor for 660 EF C 1210 ESC C 1050 ES 940 ES 940 ESO 830 ES 660 EF 660 EFO

* Meets ULC S636 Standard Also included in the Concentric termination kit (196016)
17 | 2011 Commercial water heating solutions
Electric tankless and point-of-use solutions deliver hot water virtually anywhere
www.bosch-climate.us | 18
Powerstream Pro 17 & 27 series
Whole house electric tankless water heaters
The compact and powerful RP17PT & RP27PT electric whole house tankless water heaters can be installed virtually anywhere inside the home. They are 97% efficient with minimal stand-by loss and have a built-in flow sensor that ensures a constant output temperature.
Note: These Powerstream Pro models require hard wiring.

2-YEAR WARRANTY

RP17PT RP27PT
Part # RP17PT RP17PTK (Canada) RP27PT RP27PTK (Canada)

Features

Over 97% efficiency rating Compact and lightweight Electronic flow switch Flow sensor provides a constant output temperature
Recommended Climate Zones for Installation of the RP17PT and RP27PT
Filter screen on inlet External temperature control
WA MT ND MN ID WY NE NV UT KS SD PA IA IL IN OH WV CO CA OK AZ NM AR MO KY NC TN SC MS AL TX LA FL GA VA DE MD NJ WI MI NY VT NH MA RI CT ME

Double Pole Cutouts

Polymer Encased Elements Terminal Block Flow Transducer
RP17PT for Point-of-Use or RP27PT may be used for Whole House RP17PT or RP27PT may be used for Whole House

Control PCB Temperature Control Knob
Model RP17PT is not recommended for whole house use in climates where average ground water temperature is less than 60F.
Electric Tankless RP 17 PT RP 27 PT 67
Calculations based on 120F Set Point temperature, 107F shower temperature, 2.5 GPM showerhead flow rate, 1.5 GPM sink flow rate, adequate water pressure and rated voltage. Variation from these parameters may alter actual performance. GPM shown is the hot water flow rate at 120F Set Point temperature. For additional information refer to the groundwater temperature map on page 5.
19 | 2011 Commercial water heating solutions
Powerstream Pro RP1 - RP12 compact series
Point-of-Use electric tankless water heaters
Six compact, point-of-use tankless water heaters, designed to provide an endless supply of hot water for kitchen and bathroom sinks. These units provide 99% efficiency with minimal stand-by loss and most models are equipped with high/ low kW settings. Common applications include: breakrooms, restrooms, salons and medical facilities.
These PowerStream Pro models require hard wiring.
Features RP1 - RP12 compact series
Compact, point-of-use tankless water heaters stand-by loss 99% efficient with minimal Copper heat exchanger
and copper-sheathed heating elements with high/low kW settings
Most models are equipped Units can be mounted in any direction (except RP12PT) These units require hard wiring Available in 6 models to accommodate a wide range of applications

Dimensions

Technical specifications Powerstream Pro RP1 - RP12 series
Model/ Part Number RP1P Wire Size 8GA Voltage 2404 Amps High kW3 9.50 6.00 3.40 7.20 9.50 12.00
Low kW3 4.75 3.00 3.60 4.75
Degree rise at flow rates (gpm)1, 2 0.5 N/A N/A 81F 41F 41F N/A N/A N/A N/A N/A 1.0 64F 32F 42F 21F 20F 48F 24F 64F 32F 72F 1.5 42F 21F 27F 14F N/A 32F 16F 42F 21F 52F 2.0 32F 16F N/A N/A N/A 24F 12F 32F 16F 42F
Activation Rate (gpm) 0.75

RP2P RP3P RP7P

10GA 10GA 10GA

0.50 0.50 0.75

RP9P Thermostatic Model RP12PT
gpm = Gallons Per Minute RP3P includes a 0.5 gpm faucet aerator for optimal performance High/Low kW settings possible within some settings

These units will operate on 220V at 84% of capacity and on 208V This unit is designed to operate on 240V only

at 75% of capacity

www.bosch-climate.us | 20
Ariston Pro point-of-use electric mini-tank water heaters
Easy installation and energy efficiency
The Ariston point-of-use electric mini-tank is available in three sizes. The units can be wall-hung (bracket included) or floor-mounted and come with a temperature/pressure relief valve. Simply tap into the cold water line and install the water heater directly at the sink to provide hot water. They may also be installed in-line with a larger hot water source to eliminate the wait for hot water. The two smaller units have a simple 120V AC plug-in connection.

GL2.5Ti GL4Ti GL8Ti

Saves space Provides hot water quickly at the point-of-use Stand-alone or in-line application Temperature/pressure relief valve included
No more waiting for hot water. Ideal for stand-alone use or recirculation systems

Technical specifications

Model/Part Number Tank Volume Dimensions Voltage Amperage Wire Size Heating Capacity Recovery at 90F Rise Temperature Range Water Connections GL2.5Ti 2.75 gallons 14" 4" 0" x1 x1 120V AC 12.5 amps Plug-in 1500 watts 6.8 gph 65-145F " NPT 150 psi Installed GL4Ti 3.85 gallons 14"x14"x12" 120V AC 12.5 amps Plug-in 1500 watts 6.8 gph 65-145F " NPT 150 psi Installed GL8Ti 7 gallons 17" 7" 4" x1 x1 120V AC 12.5 amps Hard-wired 1500 watts 6.8 gph 65-145F " NPT 150 psi Included
hot Ariston Pro mini-tank
Operating Pressure Relief Valve gph = gallons per hour
21 | 2011 Commercial water heating solutions
New for 2011!Bosch Compress heat pump electric water heater
The Bosch heat pump water heater is ultra efficient and shares similar technology as an ENERGY STAR qualified refrigerator. How does this work? Instead of the cooling effect created in a refrigerator, Bosch utilizes this technology in reverse mode to heat water. By using a specially designed pump, compressor and heat exchanger system, the heat is transferred from the surrounding air to the water stored in a well insulated storage tank. The result is efficient hot water and zero emissions!

Bosch Compress heat pump electric water heater
Ultra efficient with proven technology Zero emissions Designed to be Energy Star qualified standard plumbing and electrical connections same as for traditional electric water heaters for easy operation for ideal temperature, efficiency and demand settings
Simple installation requires
Easy to read LCD display allows

Ducting option increases

efficiency and makes Bosch Compress the quietest unit in the market for updated information about this new product
Visit www.bosch-climate.us
Final product design and specifications are subject to change without notice.
www.bosch-climate.us | 22
Bosch commercial installations
Bosch would like to hear about your tankless water heating success stories. Submit your installation story online at www.bosch-climate.us
48 Unit Condominium Complex Van Nuys, CA
Models Installed and Qty Bosch C 920 ESC tankless water heaters Four units cascaded Cascading outdoor installation 48 two-bedroom units with 48 showers and 96 sinks Property owner wanted to replace a one million BTU Boiler and leaking 500 gallon tank and reduce energy costs Based on energy savings the owner and plumbing contractor are estimating a short three to five year payback period
Type of System How many applications run off of it? Why Tankless?
Additional notes on install (space savings, environmental considerations, etc)
64-Room Hotel Franconia, NH
Models Installed and Qty Bosch C 920 ESC tankless water heaters Four units cascaded Tank loading application with two 100 gallon tanks 64 showers, 69 sinks, restaurant sink and dishwasher and two commercial washing machines The hotel needed a more reliable and energy efficient water heating system This installation includes long concentric vent runs which terminate out through the sidewall (horizontally)
Type of System How many applications run off of it?
Why Tankless? Additional notes on install (space savings, environmental considerations, etc.)
Community Hockey and Ice Skating Center Waterbury, VT
Models Installed and Qty Bosch C 800 ES tankless water heaters Four units cascaded Tank loading and recirculation system 13 showers, 14 sinks and a 15-gallon Zomboni filling station Greater capacity, energy savings and redundancy Complex concentric venting solution

Why Tankless? Special Features about the installation
23 | 2011 Commercial water heating solutions
Bosch system integration reinventing energy efficiency
Bosch Tankless Water Heaters
For restaurants, hotels, schools and other commercial applications, you can trust Bosch has a water heating solution to handle your needs. Every unit delivers the highest efficiency in the market and is built to stringent Bosch quality standards. With a Bosch tankless water heater you will get an endless supply of hot water and cancut your current water heating bill in half.
Bosch Solar Thermal Systems
Bosch solar hot water solutions bring the first-class technology, innovation, reliability, quality and environmental sustainability that Bosch is known for world-wide, to the next level. These systems are designed for superior energy efficiency. This is especially true when combined with a Bosch high efficiency tankless water heater as a back-up system. There is no better choice than a solar thermal system from Bosch to reduce your energy expenses and your carbon footprint.

Bosch Controls

We supply a wide selection of advanced controls to ensure that your heating and domestic hot water system delivers high efficiency and reliable heating year after year. Bosch controls give the heating engineer quick and easy access to all functions of the heating system and also allows the integration of multiple heating products.

Buderus Boilers

Our extensive boiler line includes energy efficient cast iron boilers as well as the very latest aluminum condensing boilers and multiple boiler cascade systems for maximum energy efficiency.
FHP Geothermal Heat Pumps
Our high efficiency water source heat pump systems provide the most flexible and lowest installation costs of virtually any HVAC system. These systems are the most energy and cost efficient systems on the market making them the greenest technology and the smartest investment for residential heating and cooling applications.
Tankless, solar, geothermal and boiler solutions from Bosch Bosch is committed to reinventing energy efficiency by offering smart tankless, solar, geothermal and boiler products that produce domestic hot water and indoor comfort solutions. Bosch products work alone or together as an integrated system to provide contractors, mechanical engineers and architects the opportunity to customize unique energy efficient systems.

To learn more about these products and Bosch systems visit the Energy Efficiency Home at www.bosch-climate.us
Bosch Contractor Exclusive! Join the Bosch Loyalty Program and start earning valuable rewards at www.boschhvacloyalty.com
Bosch Thermotechnology Corp. Londonderry, NH Ft. Lauderdale, FL Irvine, CA General Inquiries: 1-866-642-3198 Technical Support: 1-866-446-8987 www.bosch-climate.us
Printed on Elemental Chlorine Free, FSC-certified, minimum 10% PCW paper with vegetable-based inks.

77799301 10/10

THERM Tankless Water Heaters

Applications Manual

THERM Tankless Water Heater Applications Manual
Data subject to change without notice | 01.2011
BOSCH THERMOTECHNOLOGY CORPORATION

Table of Contents

1 Introduction 2 Bosch THERM Model Certications 3 Tankless Water Heater Accessories 4 Water Quality 5 Pump Sizing
5.1 Pressure drop curves 5.2 Domestic hot water circulation 5.3 Tank loading
6 Water Heater Sizing & Specications
6.1 Sizing tankless water heaters 6.2 Bosch tankless water heater specications
7 Outdoor Installation 8 Domestic Water Heating Applications
8.1 Low volume applications 8.2 Whole house applications
9 High Volume Potable Water Heating
9.1 Cascading unit applications 9.2 Parallel unit applications
10 Residential Solar Applications
10.1 Tankloading 10.2 Booster applications
11 Commercial Solar Applications
12 Commercial Water Heating Applications
12.1 Commercial kitchen applications 12.2 Basic tank loading with domestic recirculation 12.3 Advanced tank loading commercial hot water system

1 Introduction

This Applications Manual is intended to present some of the most common applications of the Bosch Therm tankless water heaters. Application drawings are shown with both piping and corresponding electrical schematics where applicable. Auxiliary equipment depicted does not necessarily represent any one manufacturer or specic model number. There are a wide variety of techniques, practices and piping strategies possible when installing water heating appliances. It is the responsibility of the installing contractor to determine the most suitable arrangement for the application. All drawings are conceptual in nature and does not address all design, installation or safety considerations. Additional safety and/or auxiliary equipment may be needed. Drawings are for reference use by ofcials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. It is the responsibiltiy of the installer to ensure that the installation is in accordance with local building codes. Although this manual covers many common applications for our products, system possibilities are virtually endless. Should you encounter an application that is not covered in this manual or have any questions regarding any of its content, we encourage you to contact your local sales representative or us directly at Bosch Thermotechnology. This manual is not a substitute for any of the products installation manuals. All specications subject to change. Installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54. In Canada: Installation must conform with CGA B149.(1,2) INSTALLATION CODES and/or local installation codes.
Certied by Underwriters Laboratories Inc.
Energy efciency certied by Gas Appliance Manufacturers Association (GAMA), www.gamanet.org
For Models GWH C 920 ESC and C 1210 ESC only. These models are built in accordance with the requirements of the ASME Boiler and Pressure Vessel Code and received the Certicate of Authorization from the National Board. The heat exchanger has the NB and the HLW stamps.
Plumbing-Heating-Cooling Contractors Association
Other certications: Met the California Energy Commission (CEC) standards
2 Bosch THERM Model Certications
The following are certication stamps and explanations that are specic to one or more Bosch tankless water heaters. These certications bring the appliances in accordance with the requirements of the National Fuel Gas Code ANSI Z223.1/NFPA 54.
Approved by the Commonwealth of Massachusetts South Coast Air Quality Management
Certied to applicable U.S. standards for appliances using gas or other petroleum fuel.
Certied to applicable Canadian standards for appliances using gas or other petroleum fuel.
3 Tankless Water Heater Accessories
Available accessories C 1210 ES/ C 1210 ESC Concentric Vent/air Intake kit - stainless steel (part# ESHCK) Concentric termination kit - PVC (part# 196016) Exhaust / intake bird screen (part# L2594) Vertical vent kit (part# ESVVT) Horizontal vent kit (part# 4TWHVK3SII) Outdoor kit (part# BTOK) Wireless remote control (part# TSTAT2) Cascading kit (part# 77090003962) External water lter (part# 8703305356) Gas conversion kit (part# 8719002176) Pipe cover (part# PTPCES) High temp kit (part# 7736500074) Recess box kit (part# 7736500043) Pressure relief valve (part# FWL-2) PVC Condensate drain tee (part# 196061)* Condensate neutralization cartridge kit (part# JM-2KIT) * Also included in the Concentric termination kit (part# 196016)

Table 1

C 1050 ES

940 ESO

940 ES

830 ES

Available accessories continued

Table 2

660 EF Pipe cover (part# BPCKIT) Remote control - for U.S.A (part# BRC01US) Remote control - for Canada (part# BRC01CA) Remote controller outdoor junction box (part# BOJB) Remote controller cord 10ft (3m) (part# BRC10CORD) Remote controller cord 26ft (8m) (part# BRC26CORD) Isolation valves - pressure relief valve included (part# 9260LA) Pressure relief valve (part# FWL-2) Freeze prevention kit (part# (7709003775)

660 EFO

520 HN

520 PN

330 PN

4 Water Quality
Poor water quality will have an impact on appliance longevity and may void the manufacturers warranty. For water analysis data call your local water department, or if on a well, have well water analyzed periodically. If water quality exceeds one or more of the values specied below, Bosch recommends consulting a local water treatment professional for water softening/conditioning options. Water quality max. levels Description pH TDS (Total Dissolved Solids) Total hardness Aluminum Chlorides Copper Iron Manganese Zinc pH mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm Max. Levels 6.5 - 8.100 (6 grains) 2.1.0 0.3 0.05 5.0 Table 3

5 Pump sizing

The following section outlines sizing pumps for domestic hot water circulation and tank loading. Only models approved for such applications are listed in this section.
Pump must be bronze or stainless steel. Size the pump according to the system pressure drop chart below. Maximum flow allowed through the recirc loop is 5 GPM.
If the water heater is used within an approved hot water recirculation application and supplied with circulated water, the heat exchanger warranty is decreased. Please refer to the installation manual for detailed warranty period information. Run the system for 30 minutes to remove debris from the plumbing. Then remove the units inlet water lter to decrease pressure drop through the system. If the inlet water lter, when removed, contains debris install a Y-strainer (installer supplied) on the cold water inlet.

5.1 Pressure drop curves

660 EF/EFO C 800 ES, C 1050 ES C 920 series, C 1210 series 2400 ES, 830 ES, 2700 ES, 940ES/ESO GWH 715 ES,
50 Pressure (Feet of Head)
0 0.0 1.0 2.0 Flow (GPM) 3.0 4.0 5.0
5.2 Domestic hot water circulation

5.3 Tank loading

Pressure drop vs. ow
Must provide a recirculation flow above 1.7 GPM. This can be verified in the control unit diagnostics section of the installation manual; mode P4 3d.
Note: The Grundfos model 15-55 has been tested and shown to work on recirculating systems up to 120 feet of total pipe length. System conditions vary and each pump must be sized by a professional to insure performance. Refer to pump manufacturers flow vs pressure specifications to select a pump that can provide the flow rate greater than 1.7 gpm while overcoming the pressure loss through: Tankless water heater (see Chapter 6.1) All building supply and return plumbing in the circulation loop (reference local plumbing codes, standards, or practices) System pressure drop Pressure drop " copper (PSI) 90 degree elbow 45 degree elbow 10 ft of straight pipe " 10 ft of straight pipe " 0.088 0.053 1.3 0.35

# of units

Pressure drop vs. ow Models: C1050ES, C1210ES, C1210ESC 4gpm @ 40 feet of head 8gpm @ 40 feet of head 12gpm @ 40 feet of head 16gpm @ 40 feet of head
Pressure drop vs. ow Model: 940ES/ESO
4gpm @ 32 feet of head 8gpm @ 32 feet of head 12gpm @ 32 feet of head 16gpm @ 32 feet of head
These guidelines should be followed to maximize system output:
Ensure ow through each water heater is between 3.5-5.0 gpm Isolation valves or boiler drains should installed to facilitate
descaling in applications with hard water.
Whenever possible, plumb the system or congure the tank to
draw cold supply water into the water heater during hot water use. We recommend Grundfos UP26-99, Taco 009 or equivalent potable water circulators for single unit tank loading installations.
Source: International Plumbing Code 2003 edition. Examples: 1) Average house (less than 2500 square feet) a) Total loop length approximately 120 ft b) Pump recommendation: Grundfos UP 15-55 or equivalent. 2) Large house (2500 to 5000 square feet) a) b) Total loop length approximately 240 ft Pump recommendation: Grundfos UP 25-64 or equivalent.

NOTE: Use only bronze or stainless steel pumps. Do not use pumps of iron construction as they will oxidize and clog the inlet lter on the appliance.
Recommendations for domestic hot water recirculation An Aquastat, with a 5 F differential to control the pump, is recommended. The usage of a timer is recommended to limit the energy consumption. The timer should also limit recirculation pump operation to the time of day when occupants are home and likely to use hot water. Water heater set point must be minimum of 14 F above the Aquastat setpoint. Example: Tankless water heater setpoint = 122F Aquastat setpoint = 108F Keep hot water piping insulated to limit heat loss. Set temperature on the C 1210 ESC must not exceed 140F.
This section describes the water heaters available from Bosch Thermotechnology Corporation and provides a general overview to the specications of that particular model. More detailed information is contained in the installation manuals. Download these manuals at www.BoschPro.com.
6.1 Sizing tankless water heaters
Denitions Major applications (2 GPM or more): Washing machine, bath tub, shower nozzle Minor applications(2 GPM or less): Low ow shower head, bathroom sink, kitchen sink Rule of thumb sizing The tables below provide a general rule of thumb when sizing for most residential applications. For commercial applications or for a more detailed sizing method, use the Sizing by Chart instructions below in conjunction with the charts on the next page.
Figure 1 Average ground water temperatures
Rule of Thumb Sizing Model Number C 1210 ES/ESC C 1050 ES 940 ES/ESO 830 ES 660EF/EFO 520 HN/PN 330 PN Number of Major Applications 0 Number of Minor Applications 1
EXAMPLE: Required ow rate of 2.0 GPM at a 65F rise. Refer to the graphs on the following page. Since the demand is above the 330 PN capacity, this application would require a 520 HN/PN gas tankless water heater.
Sizing by Chart Measure the ow rates at each xture that will be used simultaneously and add them together. If only one application will. be used at a time measure each xture and use the maximum ow rate observed
Using a known volume container, record several ll times. Perform the calculation below to determine the ow rate (a one gallon ll time of 30 seconds is 2.0 gallons per minute (GPM):

Flow rate (GPM) =

Volume (gallons) x 60 sec min Fill time (sec)

Using a thermometer, measure the incoming water temperature. For reference, see average ground water temperature map. Subtract this temperature from the desired hot water temperature to get the degree rise. If the desired hot water temperature is 120F and incoming temperature is 55F, the desired degree rise is 65F.

C 1210 ES/ESC

C 1050 ES 940 ES/ESO

830 ES 660 EF/EFO

520 PN/HN 330 PN
Gas Appliance Sizing Chart

90 Degree rise (F)

Flows above 10 GPM assume installation of a mixing valve to help mitigate pressure drop in the water heater and plumbing system
6.2 Bosch Tankless Water Heater Specications
Technical Specications Model Gas input (BTU/hr) Minimum ow to activate (GPM) Maximum ow rate at 35 rise (GPM) Maximum ow rate at 90 rise (GPM) Thermal Efciency Dimensions (inches) Weight (lbs.) Modulating gas valve Ignition Gas connection Water connections NG gas pressure (inches of W.C.) LP gas pressure (inches of W.C.) Water pressure Static - (PSI) C 1210 ES/ESC Min: 25,000 Max: 225,000 0.5 12.1 4.6 NG: 94% LP: 94% H: 30 W: 17 D: yes Electronic " Male NPT " Male NPT Min: 3.5 Max: 10.5 Min: 8 Max: 13 Min: 30 Min (well): 40 Max: 150 120VAC direct vent room-sealed combustion 3 or 4 PVC, CPVC, or ABS (Schedule 40) C 1050 ES Min: 19,900 Max: 199,000 0.5 10.5 3.9 NG: 92% LP: 92% H: 30 W: 17 D: yes Electronic " Male NPT " Male NPT Min: 3.5 Max: 10.5 Min: 8 Max: 13 Min: 30 Min (well): 40 Max: 150 120VAC direct vent room-sealed combustion 3 or 4 PVC, CPVC, or ABS (Schedule 40) 940 ES Min: 19,900 Max: 199,000 0.5 9.4 3.6 NG: 82% LP: 82% H: 30 W: 17 D: yes Electronic " Male NPT " Male NPT Min: 3.5 Max: 10.5 Min: 8 Max: 13 Min: 30 Min (well): 40 Max: 150 120VAC direct vent room-sealed combustion 3 or 4 Stainless steel (AL29-4C) 940 ESO Min: 19,900 Max: 199,000 0.5 9.4 3.6 NG: 82% LP: 82% H: 30 W: 17 D: yes Electronic " Male NPT " Male NPT Min: 3.5 Max: 10.5 Min: 8 Max: 13 Min: 30 Min (well): 40 Max: 150 120VAC BTOK outdoor kit included with heater 3 or 4 Outdoor vent cap supplied NG: 82% LP: 82% H: 30 W: 17 D: yes Electronic " Male NPT " Male NPT Min: 3.5 Max: 10.5 Min: 8 Max: 13 Min: 30 Min (well): 40 Max: 150 120VAC direct vent room-sealed combustion 3 or 4 Stainless steel (AL29-4C) 830 ES Min: 19,900 Max: 175,000 0.5 8.3
Electrical supply Venting options
Venting diameter (inches) Vent material
NOTE: C 1210 ES (residential model) has a maximum setpoint temperature of 140F. C 1210 ESC (commercial model) has a maximum setpoint temperature of 180F.
Technical Specications continued Model Gas input (BTU/hr) Minimum ow to activate (GPM) Maximum ow rate at 35 rise (GPM) Maximum ow rate at 90 rise (GPM) Thermal Efciency Dimensions (inches) Weight (lbs.) Modulating gas valve Ignition Gas connection Water connections NG gas pressure (inches of W.C.) LP gas pressure (inches of W.C.) Water pressure Static - (PSI) 660 EF Min: 20,000 Max: 140,000 0.5 6.6 2.6 NG: 82% LP: 82% H: 20.5 W: 13.8 D: 6.yes Electronic " Male NPT " Male NPT Min: 4 Max: 10.5 Min: 8 Max: 14 Min: 30 Min (well): 40 Max: 150 120VAC Fan assisted Vertical and horizontal termination 660 EFO Min: 20,000 Max: 140,000 0.5 6.6 2.6 NG: 82% LP: 82% H: 20.5 W: 13.8 D: 6.yes Electronic " Male NPT " Male NPT Min: 4 Max: 10.5 Min: 8 Max: 14 Min: 30 Min (well): 40 Max: 150 120VAC Outdoor installation 520 HN Min: 30,735 Max: 117,000 0.5 5.2 2.0 NG: 80% LP: 80% H: 36.75 W: 18.25 D: 10.no Hydrogenerated " Male NPT " Male NPT Min: 5.7 Max: 14 Min: 10.5 Max: 14 Min: 30 Min (well): 40 Max: 150 N/A Vertical natural draft * horizontal termination only with AQ4 vent kit N/A N/A 5 Type B-vent recommended 520 PN Min: 31,000 Max: 117,000 0.5 5.2 2.0 NG: 78% LP: 78% H: 25.79 W: 18.11 D: 8.no Standing pilot " Male NPT " Male NPT Min: 5.7 Max: 14 Min: 10.5 Max: 14 Min: 30 Min (well): 40 Max: 150 N/A Vertical natural draft * horizontal termination only with AQ4 vent kit 5 Type B-vent recommended 330 PN Min: Max: 74,900 0.5 3.3 1.3 NG: 78% LP: 78% H: 22.83 W: 12.20 D: 8.no Standing pilot " Male NPT " Male NPT Min: 5.7 Max: 14 Min: 10.5 Max: 14 Min: 30 Min (well): 40 Max: 150 N/A Vertical natural draft * horizontal termination not allowed 4 Type B-vent recommended

3 Stainless steel (AL29-4C)

7 Outdoor Installation

The models listed below are designed to be installed indoors. However, they are approved for outdoor installation when installed with the Outdoor Kit (part# BTOK):
830 ES 940 ES/ESO C 1050 ES C 1210 ES/ESC
Outdoor Kit (BTOK) installation: The installation of this outdoor kit (BTOK) is required when installing any of the above appliances outdoors. Outdoor cap easily retrots to these indoor models. Exterior water piping should be protected if short term freezing conditions could exist. Not for use in areas routinely exposed to freezing temperatures.

Minimum clearances:

Installation on vinyl siding:

A B C D E F G

Description
Directly below or adjacent to an opening; operable windows, doors and any fresh air openings From any adjacent wall Below a gutter, sanitary pipework, eaves or overhang Above ground From a gas meter or gas regulator

Min. distances

12"

1 ft 3 ft 1 ft 3 ft

Outdoor Installation Clearances
Source: NFPA 54 National Fuel Gas CodeANSI Z223.1 Installation on wood siding
8 Domestic Water Heating Applications
Potable water Potable water is water that is suitable for drinking. Bosch Water Heating appliances are approved to heat potable water only. Heating any other liquid other than potable water will void the manufacturers warranty covering the appliance. Introduction This chapter covers the various application techniques Bosch Water Heating recommends. The schematics are to be used by professional contractors in designing a domestic water heating system. The applications covered range from single appliance low volume applications to multi-appliance central domestic recirculation applications.
8.1 Low volume applications
Low volume applications cover the small applications in which a large water heater would be inefcient. Common applications for these appliances include cottages, cabins, and summer camps. The Bosch THERM 330 PN gas tankless water heater offers a compact and lightweight design for easy installation in these applications.

Symbols

Pressure relief valve

Service valves

Low flow shower

Flow direction

Bosch 330 PN
Note: Drawing is not to scale. Cold water piping to fixtures not shown for clarity purposes.
8.2 Whole house applications
Whole house applications cover the typical home applications up to a 2 or 3 bedroom house. See the sizing guide (page 9) to determine the best Bosch water heater model for your application. An enhanced design including an Ariston mini tank in line to the hot water source will reduce the wait time for hot water and improve temperature stability. 8.2.1 Bosch gas water heater Below is an example of a basic Bosch gas tankless water heater installation for the whole house.

Applicable Bosch Models:

Bosch 520 PN Bosch 830 ES Bosch 660 EFO Bosch 940 ESO Bosch C 1210 ES Bosch 520 HN Bosch 660 EF Bosch 940 ES Bosch C 1050 ES

Standard tub fixture

Service valve
8.2.2 Bosch gas water heater with buffer tank Below is an example of a Bosch gas tankless water heater installation for the whole house. An Ariston mini tank is installed in line for reduced hot water wait time and increased temperature stability.
Bosch Bosch Bosch Bosch Bosch
520 PN 830 ES 660 EFO 940 ESO C 1210 ES

Bosch Bosch Bosch Bosch

520 HN 660 EF 940 ES C 1050 ES
Ariston Pro GL4Ti - for pipe runs over 100 ft between tankless heater and Ariston, use GL8Ti
Note: place Ariston close to the point of use to reduce wait time for hot water.
8.2.3 Bosch gas water heater with domestic recirculation loop The circulator should be controlled by an external aquastat or with a timer to run only during times of expected hot water usage. Insulate piping in hot water recirculation loop to limit heat loss.
See Chapter 5 for recirculation pump parameters
Applicable Bosch Models: Bosch 520 PN
830 ES 660 EFO 940 ESO C 1210 ES
Bosch 520 HN Bosch 660 EF Bosch 940 ES Bosch C 1050 ES
Ariston Pro mini-tank (2.5, 4 and 8 gallon sizes)
Bronze or stainless steel circulator pump sized according to UPC standards
(Taco Bronze 007 or Grundfos 15-42B will cover most homes up to 3 bathrooms)

Flow check valve

Potable water expansion tank

Aquastat

8.2.4 Bosch gas water heater with direct recirculation loop Use a circulator, aquastat and/or timer, to keep a loop of hot water constantly hot and ready to use. This limits wait time for hot water delivery to the tap and excessive waste of water. Insulate piping in hot water recirculation loop to limit heat loss. If the water heater is used within an approved hot water recirculation application and supplied with circulated water, the heat exchanger warranty is decreased. Please refer to the installation manual for detailed warranty period information.

See Chapter 5.1 for recirculation pump parameters
Applicable Bosch Models: Bosch Bosch Bosch Bosch Bosch Bosch Bosch 520 PN 520 HN 660 EF/EFO 830 ES 940 ES/ESO C 1050 ES C 1210 ES/ESC

Cold water supply

Domestic hot water tap

Hot Cold

Y-strainer Domestic hot water tap
Aquastat Timer Flow check valve Potable water expansion tank Service valves Pressure relief valve Flow direction Bronze or stainless steel circulator/ pump
Potable water Potable water is water that is suitable for drinking. Bosch Water Heating appliances are approved to heat potable water only. Heating any other liquid other than potable water will void the manfucturers warranty covering the appliance. Introduction This section lays out the options for high volume water heating for large residential and light commercial applications including continuous ows.
9.1 Cascading unit applications
A cascading application should be considered if the potential hot water demand exceeds the capacity of one gas tankless water heater. The cascading set up supports variable ow inputs and is designed for large homes and commercial applications. Cascading, unlike other parallel applications, maintains the activation ow rate of a single appliance. Intelligent Cascading allows up to twenty four appliances to be connected in parallel. One of the appliances will serve as the controlling primary appliance and will attempt to meet the hot water demand. If the hot water demand is beyond the capacity of the primary appliance, a signal is sent to one or more of the secondary appliances to ignite. With the Intelligent Cascading, after each 100 hours of operation, the system will automatically rotate which heater is serving as the primary. An Intelligent Cascading Kit (part no. 7709003962) must be purchased and installed for each secondary appliance included in the installation. Example: A 7 unit cascade installation includes 1 primary appliance and 6 secondary appliances. 6 intelligent cascading kits must be purchased for this installation.
9.1.1 830ES, 940ES/ESO, C1050ES, C1210ES/ESC intelligent cascading with domestic hot water recirculation For applications with 200ft of pipe or more.

System parameters:

The plumbing must be connected in the reverse return method with a minimum number of elbows to aid in balancing pressures between the appliances. Locate appliances close together for improved performance. - Maximum distance between appliances: 36. - Minimum distance between appliances: 1. Minimum pipe diameter: (2 appliances or less). Minimum pipe diameter: 1 (3 appliances or more). Minimum water pressure: 50 psi. Insulate pipes to prevent heat loss. See Chapter 5 for recirculation pump parameters
Bosch 830 ES, Bosch 940 ES/ESO, Bosch C 1050 ES, or Bosch C 1210 ES

tankless link hot cold hot cold
tankless link tankless link hot cold

tankless link hot cold

outlet hot

Electric buffer Tank

Flow direction Potable water expansion tank Pressure relief valve Tankless link Timer
Flow check valve Bronze or stainless steel circulator
Note: Drawing is not to scale.
Domestic hot water recirculation return line
9.1.2 830ES, 940ES/ESO, C1050ES, C1210ES/ESC intelligent cascading with domestic hot water recirculation For applications with 200ft of pipe or less.
The plumbing must be connected in the reverse return method with a minimum number of elbows to aid in balancing pressures between the appliances. Locate appliances close together for improved performance. - Maximum distance between appliances: 36. - Minimum distance between appliances: 1. Minimum pipe diameter: (2 appliances or less). Minimum pipe diameter: 1 (3 appliances or more). Minimum water pressure: 50 psi. Insulate pipes to prevent heat loss.
Potable water thermal expansion tank Bronze or stainless steel circulator Flow direction Timer Pressure relief valve Flow check valve Service valves Aquastat Tankless link

Ariston GL8Ti

DHW outlet DHW outlet DHW outlet
9.2 Parallel unit applications
Two Bosch water heaters plumbed in parallel will have double the ow rate. However, the activation rate increases with each unit added in parallel. Example: 1 unit - 0.5 GPM activation rate 2 units - 1.0 GPM activation rate 3 units - 1.5 GPM activation rate

Pressure relief valves

*see text above about activation rate
Introduction This section gives a general overview of tank loading and in line booster applications for domestic hot water in conjuction with solar water heating. For additional system details, consult the Bosch Solar Technical Guide Aquastat / Water Heater setpoints Model Number C 1210 ESC 830 ES, 940 ES/ESO, C 1050 ES, C 1210 ES Aquastat setpoint 140F 126F* Water heater setpoint 14F above Aquastat setpoint 140F

10.1 Tank loading

10.1.1 Solar DHW system with gas tankless water heater tank loading In this system the gas tankless water heater keeps the comfort zone at top of tank at desired temperature.
* If local codes require higher setpoint or to increase the recovery capacity of the water heater, contact Bosch Thermotechnology.
Use applicable models with aquastat that activates circulator. Timer recommended to interrupt reheating during night time. See Chapter 5.2 for tank loading pump parameters

Collector sensor

Applicable Bosch Models: Bosch Bosch Bosch Bosch 830 ES 940 ES/ESO C 1050 ES C 1210 ES/ESC

Domestic Hot Water

Thermostatic valve Setpoint 120F Solar Controller Twin tube

Solar Pump Station

Aquastat or tank sensor
Cold Water Supply Tank sensor
Honeywell Am-1 series thermostatic mixing valve

Well thermometer

Solar storage tank

Circulator

Drain valve

Expansion tank

10.2 Booster applications
System parameters: 10.2.1 Solar DHW system with gas tankless water heater booster The tankless water heater only runs when solar water needs a boost. The Ariston mini tank provides small amounts of DHW instantly and increases comfort by buffering DHW temperature. See applicable models listed in the gure below.
Thermostatic valve 1 ensures that warm solar water bypasses the water heater and directs cooler water through the appliance when reheating is needed. Thermostatic valve 2 acts as a tempering valve that brings potentially hot water temperatures down to a level that is safe for the inhabitants.
Honeywell AM101 Thermostatic Valves required for proper operation; Remove check valves from Thermostatic Valve 1 as it is used as a diverter valve; Thermostatic Valve 2 is a tempering valve; Recommended setpoint 120F for both Valves; Set tankless water heater temperature to 140 F Ariston mini tank will provide increased temperature stability and quicker hot water delivery. (recommended but not required)

Solar Controller

Thermostatic valve 1

Tank sensor

Domestic hot water

Thermostatic valve 2

Ariston GL8ti mini tank

Water supply

10.2.2 Solar DHW system with gas tankless water heater booster and recirculation loop Similar to 10.2.1 with domestic hot water recirculation added. The tankless water heater only runs when solar heated water needs a boost. Buffer tank provides small amounts of DHW instantly and increases comfort by smoothing out DHW temperature. See applicable models listed in the gure below.
System parameters: Honeywell AM101 Thermostatic Valves required for proper operation; Remove check valves from Thermostatic Valve 1 as it is used as a diverter valve; Thermostatic Valve 2 is a tempering valve; Recommended setpoint 120F for both Valves; Set tankless water heater temperature to 140 F Ariston mini tank will provide increased temperature stability and quicker hot water delivery. (recommended but not required) Choose size of the Ariston mini tank to match the volume of the recirculation loop
Thermostatic valve 1 ensures that warm solar water bypasses the water heater and directs cooler water through the appliance when reheating is needed. Thermostatic valve 2 acts as a tempering valve that brings potentially hot water temperatures down to a level that is safe for the users.
Honeywell Am-1 series thermostatic mixing valve Service valve Pressure relief valve Solar storage tank Potable water expansion tank Flow direction Flow check valve
System parameters: Introduction This section provides a general overview for commercial hot water systems in conjuction with solar water heating (e.g. schools, tness centers). For additional system details, consult the Bosch Solar Technical Guide. Honeywell AM101 Thermostatic Valves required for proper operation. For optimal performance, the ow through the water heater should be between 3.5 -5 gpm
See Chapter 5.1 and 5.2 for recirculation pump parameters
Applicable Bosch Models: Bosch C 1210 ES/ESC

Twin tube

Thermostatic valve Setpoint 120F
Aquastat or tank sensor Hot water recirculation return line

Cold Water Supply

DHW recirculation pump
Honeywell Am-1 series thermostatic mixing valve Well thermometer
Introduction This section gives a general overview of high volume, high temperature water heating for commercial applications.
12.1 Commercial Kitchen applications
12.1.1 Commercial kitchen This design allows for temperature stability with short, repeated hot water demands such as a super sprayer. It also provides high temperature water for a commercial dishwasher. When using the super sprayer, hot water draws must be longer than 15 seconds to avoid temperature uctuations.
System parameters: Set Ariston mini-tank to maximum temperature. Set tankless water heater temperature per dishwasher temperature requirements.
Applicable Bosch Models: Bosch Bosch Bosch Bosch
C 1210 ES/ESC, C 1050 ES, 940 ES/ESO, 830 ES

Dish sprayer

Y-strainer Dishwasher with heating element
Honeywell Am-1 series thermostatic mixing valve Well thermometer Service valve Pressure relief valve Potable water expansion tank Flow direction
Note: Drawing not to scale. Cold water piping to fixtures not shown for clarity purposes.
12.1.2 Commercial kitchen with domestic hot water recirculation
System parameters: For optimum performance in applications involving a commercial dishwasher, a hot water circulation loop is recommended.

Cold Water Supply Sink

Dishwasher with heating element

Y-strainer

Circulator (stainless steel or bronze) Honeywell Am-1 series thermostatic mixing valve Well thermometer Service valve Pressure relief valve Potable water expansion tank Flow direction Flow check valve
12.2 Basic tank loading with domestic recirculation
The following application outlines general tank loading with one or more gas tankless water heaters in parallel. Domestic hot water recirculation shown is optional. Aquastat / Water Heater setpoints Model Number C 1210 ESC Aquastat setpoint 140F 126F* Water heater setpoint 14F above Aquastat setpoint 140F
Aquastat/tank sensor Tset 120-140F, <10F differential. 30-119 gallon storage tank recommended DHW return line can tie directly into tank if ttings are available. Individual pumps (i.e. UP26-99) can be used on supply to each heater or one pump (as shown) for the entire system See Chapter 5.1 and 5.2 for pump parameters 830 ES, 940 ES, C 1050 ES, C 1210 ES
Applicable Bosch Models: Bosch 830 ES Bosch C 1050 ES
Bosch 940 ES Bosch C 1210 ES/ESC
Domestic Hot Water supply
Hot water recirculation return line
Pressure relief valve Solar storage tank Bronze or stainless steel circulator Potable water expansion tank Flow check valve
12.3 Advanced tank loading commercial hot water system
The following application outlines an advanced tank loading application for commercial hot water systems (e.g. hotels, tness centers). This design allows for complete isolation of the system for maintenance reasons and gives the ability to bypass certain system components in case of failure. A second hot water storage tank is shown for additional hot water supply and back up in case of tank failure. Aquastat / Water Heater setpoints Model Number C 1210 ESC 830 ES 940 ES, C 1050 ES, C 1210 ES Aquastat setpoint 140F 126F* Water heater setpoint 14F above Aquastat setpoint 140F
See Chapter 5.1 and 5.2 for pump parameters

cold supply

Thermostatic mixing valve

Tankless link

Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel: 1-866-642-3198 Fax: 1-603-584-1687 www.bosch-climate.us
BTC 740001301 B | 01.2011