GREENTHERM & THERM Tankless Water Heaters

WARNING: If the information in this manual is not followed exactly, a re or explosion may result causing property damage, personal injury or death. Follow each appliance's instructions precisely. Installation and service must be performed by a trained and certied installer, service agency or the gas supplier. Application drawings in this manual are conceptual only and do not purport to address all design, installation, code, or safety considerations. The diagrams in this manual are for reference use by code of cials, designers and licensed installers. It is expected that installers have adequate knowledge of national and local codes, as well as accepted industry practices, and are trained on equipment, procedures, and applications involved. Drawings are not to scale. Refer to the appliance and accessory installation manuals for additional detailed information! GREENTHERM & THERM Tankless Water Heaters C1210ES/ESC, C1050ES, C950ES, 940ES, 940ESO, 830ES, 520HN, 520PN, 330PN Applications Manual

2 THERM/GREENTHERM Tankless Water Heaters Applications Manual Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 3 Table of Contents 1 Explanation of symbols 4 2 Introduction 5 3 Model Certications 5 4 Tankless Water Heater Accessories 6 5 Pump sizing for circulation 7 5.1 Pressure drop curves 7 5.2 Domestic hot water circulation 8 5.3 Tank loading 9 6 Water Heater Sizing & Specications 10 6.1 Sizing tankless water heaters 10 6.2 Tankless Water Heater Specications 12 7 Water Quality 14 8 Applications Legend 15 9 Domestic Hot Water Applications 16 9.1 Low volume applications 17 9.2 Whole house applications 18 10 High Volume Potable Water Heating 22 10.1 Cascading unit applications 22 10.2 Parallel unit applications 25 11 Residential Solar Applications 26 11.1 Booster applications 27 12 Commercial Solar Applications 29 13 Commercial Water Heating Applications 30 13.1 Commercial Kitchen applications 31 13.2 Tank loading with domestic hot water recirculation 32 13.3 Advanced tank loading commercial hot water system 33 13.4 Common Venting 34 Bosch Thermotechnology Corp. Data subject to change

4 THERM/GREENTHERM Tankless Water Heaters Applications Manual 1 Explanation of symbols Warnings Warnings in this document are identied by a warning triangle printed against a grey background. Keywords at the start of a warning indicate the type and seriousness of the ensuing risk if measures to prevent the risk are not taken. The following keywords are dened and can be used in this document: NOTICE indicates that damage to property may occur. CAUTION indicates that personal injury may occur. WARNING indicates that severe personal injury may occur. DANGER indicates that severe personal injury or death may occur. Important information Important information in cases where there is no risk of personal injury or material losses is identi- ed by the symbol shown on the left. It is bordered by horizontal lines above and below the text. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 5 2 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 best solution for the application. 3 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. Energy Star qualied (models C 1050 ES, C 950 ES, 940 ES, 940 ESO, 830 ES, 660 EF, 660 EFO). NOTICE: All drawings are conceptual in nature and do 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. 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. 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 Corp. This manual is not a substitute for any of the appliance installation manuals. All specications are subject to change. National Sanitation Foundation International certied. Energy efciency certied by AHRI - Air-Conditioning, Heating, and Refrigeration Institute. NOTICE: 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. R For model C 1210 ESC only. This model is 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. Other certications: Meets California Energy Commission (CEC) standards. Approved by the Commonwealth of Massachusetts. South Coast Air Quality Management - 2012 For Models 830 ES, 940 ES, 940ESO, C 950 ES, C 1050 ES, C 1210 ES and C 1210 ESC only. Bosch Thermotechnology Corp. Data subject to change

6 THERM/GREENTHERM Tankless Water Heaters Applications Manual 4 Tankless Water Heater Accessories * Available accessories Concentric vent/air intake kit stainless steel Part number C 1210 ES / C 1210 ESC C 1050 ES C 950 ES 940 ES 940 ESO 830 ES ESHCK Concentric termination kit - PVC* 196016 Exhaust/intake bird screen - PVC L2594 Vertical vent kit ES VVT Horizontal vent kit 4TWHVK3SII Outdoor kit for Therm 7709003913 Wireless remote control TSTAT2 Intelligent cascading kit 7709003962 High temperature kit 7736500074 PVC Condensing drain tee 196061 Condensate neutralization cartridge kit¹ JM-2KIT Isolation valve kit with PRV ES ISO KIT Pipe Cover W2-3 Silver PTPCES Recess Box for 830 ES to C 1210 ES models 7736500043 Polypropylene up and out venting kit 7738003210 Polypropylene common venting system for up to 4 units see vent catalog Meets ULC S636 Standard Also included in the Concentric termination kit (196016) ¹ Condensate neutralization cartridge kit may be used for non-condensing product vent systems Available accessories Part number 520 HN 520 PN 330 PN Freeze prevention kit 7709003775 Isolation valve kit with PRV ES ISO KIT Power vent w/back draft apper AQ4 Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 7 5 Pump sizing for circulation The following section outlines pump sizing for domestic hot water recirculation and tank loading. Only models approved for such applications are listed in this section. Pump must be bronze or stainless steel and designed for potable water systems. Size the pump according to the pressure drop curve of your Therm model (fig. 1 below) and the loop pressure drop tables. For direct DHW recirculation and tank loading applications: Run the system for 30 minutes to remove debris from the plumbing. Then remove the unit s inlet water lter to decrease pressure drop through the system. If the inlet water lter, when removed, contains debris, it is recommended to install a 40 mesh Y-strainer (installer supplied) on the cold water inlet. Maximum flow allowed for tank loading through the pump loop is 5 GPM. Maximum flow recommended for direct DHW recirculation is 3 GPM. Maximum flow allowed for mini-tank DHW recirculation is 2 GPM. 5.1 Pressure drop curves C 950 ES C 1050 ES C 1210 series 830 ES, 940 ES / ESO 70 60 50 Pressure (Feet of Head) 40 30 20 10 0 0.0 1.0 2.0 3.0 4.0 5.0 Flow (GPM) Figure 1 Pressure drop curves Bosch Thermotechnology Corp. Data subject to change

8 THERM/GREENTHERM Tankless Water Heaters Applications Manual 5.2 Domestic hot water circulation 5.2.1 Ariston mini-tank DHW recirculation Reference drawing 9.2.3 on page 20. If recirculating through an Ariston mini-tank only, use the smallest pump that will overcome the pressure of the loop. Recommended ow rate within the range of 1 to 2 GPM. This method of recirculation maintains warranty. The tank and the Therm should be set at roughly the same temperature. An aquastat is required to control the recirculation pump operation. An aquastat temperature setting of 110 F with a 10 F differential is recommended. The recirculation flow must be <2 gpm. Higher flows will waste energy and can erode the Ariston anode, requiring frequent anode replacement to maintain its warranty. To minimize energy costs: 1. Insulate all pipes in the recirculation loop. 2. Install a timer or sensor system that will shut the pump off when hot water will not be used. Recirculation loops over 200 feet in total length will require an electric tank with a larger heating capacity than the Ariston 8 gallon model. 5.2.2 Direct DHW recirculation Reference drawing 9.2.4 on page 21. If the Bosch tankless water heater provides the heat source for recirculated water, the heat exchanger warranty is decreased. Please refer to the installation manual for detailed warranty period information. Direct recirculation flow through the tankless water heater must be above 1.7 gpm for best performance. Flow can be verified in the diagnostic menu, mode P4-3d. Refer to the Diagnostic Menu section of your Therm installation manual for details. System conditions vary and each pump must be sized by a professional to insure performance. Refer to pump manufacturers ow vs pressure specications to select a pump that can provide ow between 1.7 gpm and 3 gpm while overcoming the pressure loss through the Therm and the recirculation loop. Refer to gure 1 and table... to determine pressure loss. 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. When properly installed in a direct recirculation application the Therm will regulate water temperature in a recirculation loop within a 20 F range. A thermostatic mixing valve is required after the water heater if no other temperature control is used. Closer temperature control can also be accomplished with a recirculation pump aquastat. The Therm temperature setting must always be at least 14 F higher than the aquastat cut-out setting. EXAMPLE: Therm temperature setting: 122 F Aquastat cut-out temperature setting: 108 F To minimize energy costs: 1. Insulate all pipes in the recirculation loop. 2. Install a timer or sensor system that will shut the pump off when hot water will not be used. Recirculation Loop Pressure Drop at 2GPM (Feet of Head) 10 ft Pipe 90 Elbow 45 Elbow Tee Branch ½" Type L Copper 0.85 0.09 0.05 0.18 ¾" Type L Copper 0.15 0.03 0.01 0.05 ¾" Pex 0.25 0.02 N/A 0.03 " Pex 0.53 0.04 N/A 0.06 ½" Pex 1.3 0.12 N/A 0.18 Source: 2009 International Plumbing Code EXAMPLE: Sizing a pump for a 2gpm direct DHW recirc system with a THERM 940ES and have 150 ft total loop length. Head Loss Loop Component 9.00 ft 940ES (See Fig.1, page 7) 1.20 ft 80 ft of ¾" copper 5.90 ft 70 ft of ½" copper return 0.24 ft 8 x ¾" 90 elbows 0.10 ft 2 x ¾" Tees (branch) 0.72 ft 8 x ½" 90 elbows + 0.18 ft 1 x ½" Tee (branch) 17.34 ft Minimum Pump Head at 2.0 gpm Once the loop head loss has been calculated, use the pump manufacturer s performance curves to select the proper potable water circulator at the required ow rate. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 9 5.3 Tank loading Refer to drawings 13.2 and 13.3 on pages 32 and 33. Tank loading pairs tankless water heaters with storage tanks to maximize peak ow for high demand applications. A tank load system, because of the added storage, can provide a high peak ow with fewer tankless units and lower installed cost. These guidelines should be followed to maximize system output: Ensure flow through each water heater is between 3.5-5.0 gpm. Isolation valves or boiler drains should be installed to facilitate descaling in applications with hard water. For best performance, plumb the system or configure the tank to draw cold supply water into the water heater during hot water use. Maintain a 20 degree temperature difference between tankless set-point and desired tank temperature. Do not use a cascading kit in a tank loading application. When multiple tankless water heaters are used, the total equivalent length of piping to each unit should be kept roughly equal. A reverse return piping scheme is recommended to equalize flow through each water heater. For tank temperature settings above 120 F, the Therm C 1210 ESC is recommended. Other high capacity Therms including the 830 ES, 940 ES/ESO, C 950 ES and C 1050 ES can be used, but a high temperature kit (part 7736500074) is required for each. In these applications a thermostatic mixing valve is required. Tank Loading Loop Pressure Drop at 4GPM (Feet of Head) 10 ft Pipe 90 Elbow 45 Elbow Tee Branch ¾" Type L Copper 0.48 0.1 0.03 0.15 1" Type L Copper 0.14 0.04 0.02 0.07 1.25" Type L Copper 0.06 0.02 0.01 0.04 1.5" Type L Copper 0.03 0.01 <0.01 0.02 2" Type L Copper 0.01 <0.01 <0.01 0.01 Pressure drop vs. ow* # of Units C 1210 ES / ESC, C 1050 ES, C 950 ES 940 ES, 940 ESO, 830 ES 1 40 feet of head @ 4gpm 32 feet of head @ 4gpm 2 40 feet of head @ 8gpm 32 feet of head @ 8gpm 3 40 feet of head @ 12gpm 32 feet of head @ 12gpm 4 40 feet of head @ 16gpm 32 feet of head @ 16gpm 5 40 feet of head @ 20gpm 32 feet of head @ 20gpm 6 40 feet of head @ 24gpm 32 feet of head @ 24gpm 7 40 feet of head @ 28gpm 32 feet of head @ 28gpm 8 40 feet of head @ 32gpm 32 feet of head @ 32gpm 9 40 feet of head @ 36gpm 32 feet of head @ 36gpm 10 40 feet of head @ 40gpm 32 feet of head @ 40gpm 11 40 feet of head @ 44gpm 32 feet of head @ 44gpm 12 40 feet of head @ 48gpm 32 feet of head @ 48gpm 13 40 feet of head @ 52gpm 32 feet of head @ 52gpm 14 40 feet of head @ 56gpm 32 feet of head @ 56gpm 15 40 feet of head @ 60gpm 32 feet of head @ 60gpm 16 40 feet of head @ 64gpm 32 feet of head @ 64gpm 17 40 feet of head @ 68gpm 32 feet of head @ 68gpm 18 40 feet of head @ 72gpm 32 feet of head @ 72gpm 19 40 feet of head @ 76gpm 32 feet of head @ 76gpm 20 40 feet of head @ 80gpm 32 feet of head @ 80gpm 21 40 feet of head @ 84gpm 32 feet of head @ 84gpm 22 40 feet of head @ 88gpm 32 feet of head @ 88gpm 23 40 feet of head @ 92gpm 32 feet of head @ 92gpm 24 40 feet of head @ 96gpm 32 feet of head @ 96gpm EXAMPLE: Sizing a pump for a 4GPM tank loading DHW system with a 1050ES and a 20 ft total loop length. Head Loss Loop Component 39.00 ft 1050es (See Fig.1, page 7) 1.00 ft 20 ft of ¾ copper 0.80 ft 8 x ¾ 90 elbows + 0.30 ft 2 x ¾ Tees (branch) 41.10 ft Minimum Pump Head at 4.0 gpm Once the loop head loss has been calculated, use the pump manufacturer s performance curves to select the proper potable water circulator at the required ow rate. Source: 2009 International Plumbing Code * Calculations based on 120 F Set-point temperature, 107 F shower temperature, 2.5 GPM showerhead ow rate, 1.5 GPM sink ow rate, adequate water pressure and gas supply. Variation from these parameters may alter performance. GPM shown is the hot water ow rate at 120 F Set-point temperature. Bosch Thermotechnology Corp. Data subject to change

10 THERM/GREENTHERM Tankless Water Heaters Applications Manual 6 Water Heater Sizing & Specications This section describes the water heaters available from Bosch Thermotechnology Corp. and provides a general overview to the specications of each particular model. More detailed information is contained in the installation manuals. Download manuals at www.bosch-climate.us. 6.1 Sizing tankless water heaters 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. Sizing by Chart Measure the flow rates at each fixture that will be used simultaneously and add them together. If only one application will be used at a time measure each fixture and use the maximum flow rate observed. Using a known volume container, record several fill times. Perform the calculation below to determine the flow rate (a one gallon fill time of 30 seconds is 2.0 gallons per minute (GPM): Flow rate (GPM) = Volume (gallons) Fill time (sec) x sec 60 min CA OR WA NV ID AZ UT MT CO WY Figure 2 Average ground water temperatures NM ND SD NE KS TX OK MN IA MO AR LA WI IL MS MI IN TN KY AL OH GA WV NC SC PA FL VA NY VT NH MA NJ DE MD ME RI CT F 77 72 67 62 57 52 47 42 37 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. EXAMPLE: Required flow rate of 2.0 GPM at a 65F rise. Refer to the graphs on page 10. Since the demand is above the 330 PN capacity, this application would require a 520 HN/PN gas tankless water heater. Hot water ow rate at 120 F Set Point temperature Inlet temperature ( F) Model 77 72 67 62 57 52 47 42 37 C 1210 ES / ESC 9.8 8.8 8.0 7.3 6.7 6.2 5.8 5.4 5.1 C 1050 ES 8.5 7.6 6.9 6.3 5.8 5.4 5.0 4.7 4.4 C 950 ES 7.7 6.9 6.2 5.7 5.2 4.9 4.5 4.2 4.0 940 ES / ESO 7.7 6.9 6.2 5.7 5.2 4.9 4.5 4.2 4.0 830 ES 6.7 6.0 5.4 5.0 4.6 4.2 4.0 3.7 3.5 520 HN / PN 4.3 3.8 3.5 3.2 2.9 2.7 2.5 2.3 2.2 330 PN 2.7 2.4 2.2 2.0 1.9 1.7 1.6 1.5 1.4 Simultaneous Showers Sink Faucet Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 11 13 12 11 10 9 C 1210 ES/ C 1210 ESC C 1050 ES C 950 ES Flow Rate (GPM) 8 7 6 5 4 3 2 1 0 10 20 30 40 50 60 70 80 90 Temperature rise ( F) 100 110 120 130 140 Figure 3 Flow rate vs. temperature rise - condensing models 11 10 9 8 940 ES/ 940 ESO 830 ES 7 Flow Rate (GPM) 6 5 520 HN/ 520 PN 4 3 330 PN 2 1 0 10 20 30 40 50 60 70 80 90 Temperature rise ( F) 100 110 120 130 140 Figure 4 Flow rate vs. temperature rise - non-condensing models Flows above 10 GPM require installation of a mixing valve to help mitigate pressure drop in the water heater and plumbing system Temperature rises above 110 F or more, or output temperatures above 140 F require either a commercial unit or optional accessories such as a high temperature kit. Bosch Thermotechnology Corp. Data subject to change

12 THERM/GREENTHERM Tankless Water Heaters Applications Manual 6.2 Tankless Water Heater Specications Technical Specications Gas input Unit BTU/hr C 1210 ES / C 1210 ESC Max: 225,000 Min: 25,000 Models C 1050 ES C 950 ES 940 ES 940 ESO 830 ES Max: 199,000 Min: 19,900 Max: 175,000 Min: 19,900 Max: 199,000 Min: 19,900 Max: 199,000 Min: 19,900 Minimum ow to activate GPM 0.5 0.5 0.5 0.5 0.5 0.5 Maximum ow rate at 35 rise GPM 12.1 10.5 9.2 9.4 9.4 8.3 Maximum ow rate at 90 rise GPM 4.6 3.9 3.6 3.6 3.6 3.6 Thermal efciency % NG: 94 LP: 94 NG: 94 LP: 94 NG: 93 LP: 93 NG: 82 LP: 82 NG: 82 LP: 82 Energy factor N/A.94.93.83.83.83 Dimensions Inches H: 30½ W: 17 D: 11¼ H: 30½ W: 17 D: 11¼ H: 30½ W: 17 D: 11¼ H: 30½ W: 17 D: 11¼ H: 30½ W: 17 D: 11¼ Max: 175,000 Min: 19,900 NG: 82 LP: 82 H: 30½ W: 17 D: 11¼ Weight LBS 88 74 74 67 67 67 Modulating gas valve Electronic Electronic Electronic Electronic Electronic Electronic Ignition Electronic Electronic Electronic Electronic Electronic Electronic Gas connection Inches ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT Water connections Inches ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT ¾ Male NPT NG gas pressure LP gas pressure Water pressure- static Inches of W.C. Inches of W.C. PSI Min: 3.5 Max: 10.5 Min: 8.0 Max: 13.0 Min: 30 Min (well): 40 Max: 145 Min: 3.5 Max: 10.5 Min: 8.0 Max: 13.0 Min: 30 Min (well): 40 Max: 150 Min: 3.5 Max: 10.5 Min: 8.0 Max: 13.0 Min: 30 Min (well): 40 Max: 150 Min: 3.5 Max: 10.5 Min: 8.0 Max: 13.0 Min: 30 Min (well): 40 Max: 150 Min: 3.5 Max: 10.5 Min: 8.0 Max: 13.0 Min: 30 Min (well): 40 Max: 150 Electrical supply VAC 120 120 120 120 120 120 Venting options direct vent, room-sealed, combustion direct vent, room-sealed, combustion direct vent, room-sealed, combustion direct vent, room-sealed, combustion outdoor installation only Venting diameter Inches 3 or 4 3 or 4 3 or 4 3 or 4 N/A 3 or 4 Vent material Temperature range F PP common vent, PP twin pipe, PVC, CPVC, or ABS (Schedule 40) 100-180 F (ESC) 100-140 F (ES) PP common vent, PP up and out concentric vent, PP twin pipe, PVC, CPVC, or ABS (Schedule 40) 100-140 F 100-184 F (requires HT kit) PP common vent, PP up and out concentric vent, PP twin pipe, PVC, CPVC, or ABS (Schedule 40) 100-140 F 100-184 F (requires HT kit) Stainless steel (AL29-4C) 100-140 F 100-184 F (requires HT kit) Outdoor vent cap supplied 100-140 F 100-184 F (requires HT kit) Min: 3.5 Max: 10.5 Min: 8.0 Max: 13.0 Min: 30 Min (well): 40 Max: 150 direct vent, room-sealed, combustion Stainless steel (AL29-4C) 100-140 F 100-184 F (requires HT kit) Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 13 - C 1210 ES (residential model) has a maximum set-point temperature of 140 F. - C 1210 ESC (commercial model) has a maximum set-point temperature of 180 F. - To achieve temperatures up to 184 F with C 1050 ES, C950 ES, 940 ES, 940 ESO, and 830 ES, the optional High Temperature kit #7736500074 is required. The following models are designed to be installed indoors but may be installed outdoors with the Outdoor Kit: 830 ES, 940 ES, C 950 ES, C 1050 ES, C 1210 ES / ESC. Please refer to the installation manuals for details. Technical specications Gas input Unit BTU/hr 520 HN 520 PN 330 PN Max: 117,000 Min: 30,735 Max: 117,000 Min: 30,735 Minimum ow to activate GPM 0.5 0.5 0.5 Maximum ow rate at 35 rise GPM 5.2 5.2 3.3 Maximum ow rate at 90 rise GPM 2.0 2.0 1.3 Thermal efciency % NG: 80 LP: 80 NG: 78 LP: 78 Energy factor N/A N/A N/A Dimensions Inches H: 25.79 W: 17.11 D: 8.66 H: 25.79 W: 18.11 D: 8.66 Max: 74,900 Min: 30,735 NG: 78 LP: 78 H: 22.83 W: 12.20 D: 8.66 Weight LBS 35 35 36 Modulating gas valve Mechanical Mechanical Mechanical Ignition Hydrogenerated Standing pilot Standing pilot Gas connection Inches ¾ Male NPT ¾ Male NPT ½ Male NPT Water connections Inches ½ Male NPT ½ Male NPT ½ Male NPT NG gas pressure LP gas pressure Water pressure- static Inches of W.C. Inches of W.C. PSI Min: 5.7 Max: 14.0 Min: 10.5 Max: 14.0 Min: 30 Min (well): 40 Max: 150 Min: 5.7 Max: 14.0 Min: 10.5 Max: 14.0 Min: 30 Min (well): 40 Max: 150 Electrical supply VAC N/A N/A N/A Venting options Vertical natural draft, Horizontal termination only with AQ4 vent kit Vertical natural draft, Horizontal termination only with AQ4 vent kit Venting diameter Inches 5 5 4 Vent material Type B-vent recommended Type B-vent recommended Min: 5.7 Max: 14.0 Min: 10.5 Max: 14.0 Min: 30 Min (well): 40 Max: 150 Vertical natural draft, Horizontal termination not allowed Type B-vent recommended Temperature range F High to low High to low High to low Bosch Thermotechnology Corp. Data subject to change

14 THERM/GREENTHERM Tankless Water Heaters Applications Manual 7 Water Quality Water quality can have an impact on appliance longevity and may void the manufacturer's 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 installing a water conditioner or softener. If the tankless water heater is operating in applications where the outlet temperature exceeds 140 F, a water softening system is strongly recommended. The higher the set temperature is on the appliance, the greater the risk for scale/mineral deposits. Damage from scale/mineral deposits is not covered under warranty. Refer to manufacturer s limited warranty. Water quality limits Description Unit Max. Levels ph ph 6.5-8.5 TDS (total dissolved solids) mg/l or ppm 500 Total hardness mg/l or ppm 100 (6 grains) Aluminum mg/l or ppm 2.0 Chlorides mg/l or ppm 250 Copper mg/l or ppm 1.0 Iron mg/l or ppm 0.3 Manganese mg/l or ppm 0.05 Zinc mg/l or ppm 5.0 Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 15 8 Applications Legend Tank drain valve Pump Thermostatic 3-way valve Automatic air vent valve Gauge Manual air vent valve Shutoff valve with drain Timer Check valve Expansion tank Two way shutoff valve Sink Safety relief valve Standard tub Y-Strainer Shower Shutoff valve with temperature gauge Solar supply pipe Temperature sensor Solar return pipe Aquastat Line voltage connection Cold water pipe Sensor connection Hot water pipe Intelligent cascade kit NOTICE: These drawings are conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices may be needed or required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and local codes. Best installation practices should be followed. Bosch Thermotechnology Corp. Data subject to change

16 THERM/GREENTHERM Tankless Water Heaters Applications Manual 9 Domestic Water Heating Applications Potable water Potable water is water that is suitable for drinking. Bosch Thermotechnology Corp. appliances are approved to heat potable water only. Heating any other liquid other than potable water will void the manufacturer s warranty covering the appliance. Introduction This chapter covers the various application techniques Bosch Thermotechnology Corp. 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 to multi-appliance central domestic recirculation. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 17 9.1 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 520HN, 520PN and 330PN gas tankless water heaters offers compact and lightweight design for easy installation in these applications. Applicable models: Bosch 330 PN, 520 PN, 520 HN. Bosch Thermotechnology Corp. Data subject to change

18 THERM/GREENTHERM Tankless Water Heaters Applications Manual 9.2 Whole house applications Whole house applications cover the typical home applications up to a 2 to 4 bathroom house. See the sizing guide (page 9) to determine the best Bosch water heater model for your application. An enhanced design combining an Ariston mini tank in line after the Bosch water heater will reduce wait times and improve temperature stability. 9.2.1 Bosch gas water heater Below is an example of a basic Bosch gas tankless water heater installation for the whole house. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 19 9.2.2 Bosch gas water heater with buffer tank Below is an example of a Bosch gas tankless water heater installation for the whole house. A Bosch Tronic 3000T mini tank (model ES8) is installed in line for reduced hot water wait time and increased temperature stability. Applicable models: Bosch 520 PN, 520 HN, 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES. Bosch Bosch Thermotechnology Corp. Data subject to change

20 THERM/GREENTHERM Tankless Water Heaters Applications Manual 9.2.3 Bosch gas water heater with domestic recirculation loop The circulator should be controlled by an external aquastat and/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 5.2 for recirculation pump parameters Applicable models: Bosch 520 PN, 520 HN, 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, Mini tank: Bosch Tronic 3000T ES8. Bosch Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 21 9.2.4 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. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES. See Chapter 5.2 for recirculation pump parameters In this application the heat exchanger warranty is reduced to 3 years. Please refer to section 8.2.3 for an application that maintains full warranty. Please refer to the installation manual for detailed warranty period information. Bosch Thermotechnology Corp. Data subject to change

22 THERM/GREENTHERM Tankless Water Heaters Applications Manual 10 High Volume Potable Water Heating Potable water Potable water is water that is suitable for drinking. Bosch Thermotechnology Corp. appliances are approved to heat potable water only. Heating any other liquid other than potable water will void the manfucturer s 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. 10.1 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. Use of the Intelligent Cascading Kit, 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. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 23 10.1.1 Intelligent cascading with domestic hot water recirculation For applications with 200ft of pipe or more. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES See Chapter 5.2 for recirculation pump parameters 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: ¾ (2 appliances or less) Minimum pipe diameter: 1 (3 appliances or more). Minimum water pressure: 50 psi. Insulate pipes to prevent heat loss. Bosch Thermotechnology Corp. Data subject to change

24 THERM/GREENTHERM Tankless Water Heaters Applications Manual 10.1.2 Intelligent cascading with domestic hot water recirculation For applications with 200ft of pipe or less. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES See Chapter 5.2 for recirculation pump parameters 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: ¾ (2 appliances or less). Minimum water pressure: 50 psi. Insulate pipes to prevent heat loss. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 25 10.2 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. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES. Example: 1 unit - 0.5 GPM activation rate 2 units - 1.0 GPM activation rate 3 units - 1.5 GPM activation rate Optional Cascade Kit NOTICE: Use the Intelligent Cascading Kit only if low activation flows are desired, and if it doesn't matter if full flow is not available instantly. If the application demands higher flow rates more quickly, do not install the Intelligent Cascading Kit. If the Intelligent Cascading Kit is used the minimum activation flow rate is equal to the activation flow rate of a single unit. Bosch Thermotechnology Corp. Data subject to change

26 THERM/GREENTHERM Tankless Water Heaters Applications Manual 11 Residential Solar Applications 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 Aquastat setpoint Water heater setpoint C 1210 ESC 830 ES, 940 ES/ESO, C 950 ES, C 1050 ES, C 1210 ES 140 F 14 F above Aquastat setpoint 126 F* 140 F * If local codes require higher setpoint or to increase the recovery capacity of the water heater, contact Bosch Thermotechnology. See Chapter 5.2 for recirculation pump parameters Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 27 11.1 Booster applications System parameters: 11.1.1 Solar DHW system with gas tankless water heater booster The tankless water heater only runs when solar water needs a boost. See applicable models listed in the figure below. Thermostatic valve 1 ensures that warm solar water bypasses the water heater and directs cooler water through the appliance when boosting 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 120 F for both Valves; Set tankless water heater temperature to 140 F Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES. Bosch Thermotechnology Corp. Data subject to change

28 THERM/GREENTHERM Tankless Water Heaters Applications Manual 11.1.2 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. See applicable models listed 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 Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES. 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 120 F for both Valves; Set tankless water heater temperature to 140 F See Chapter 5.2 for recirculation pump parameters Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 29 12 Commercial Solar Applications 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. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES. System parameters: Honeywell AM101 Thermostatic Valves required for proper operation; See Chapter 5.2 for recirculation pump parameters Bosch Thermotechnology Corp. Data subject to change

30 THERM/GREENTHERM Tankless Water Heaters Applications Manual 13 Commercial Water Heating Applications Introduction This section gives a general overview of high volume, high temperature water heating for commercial applications. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 31 13.1 Commercial Kitchen applications System parameters: 13.1.1 Commercial kitchen with domestic hot water recirculation Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, C 1210 ESC. When using the super sprayer, hot water draws must be longer than 15 seconds to avoid temperature uctuations. For optimum performance in applications involving a commercial dishwasher, a hot water circulation loop is recommended. See Chapter 5.2 for recirculation pump parameters Bosch Thermotechnology Corp. Data subject to change

32 THERM/GREENTHERM Tankless Water Heaters Applications Manual 13.2 Tank loading with domestic hot water recirculation The following application outlines a tank loading application for commercial hot water systems where reliability is critical (e.g. hotels, tness centers). This design allows for the isolation of the major system components for service or in case of failure. The redundant modular design allows continued system operation even after a tank or pump or water heater has failed. Domestic hot water recirculation through is optional. Do not use the Intelligent Cascading Kit in tank loading applications. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, C 1210 ESC. System parameters: Aquastat/tank sensor setpoint temperature 120-140 F, <10 F differential. 30-119 gallon storage tank recommended. DHW return line can tie directly into tank if fittings are available. Individual pumps can be used on supply to each heater (as shown) or one pump for the entire system. Maintain a 20 degree difference between tankless set-point and desired tank temperature. See Chapter 5.2 for recirculation pump parameters DHW supply DHW return Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 33 13.3 Advanced tank loading commercial hot water system See Chapter 5.2 for recirculation pump parameters The following application outlines an advanced tank loading application for commercial hot water systems (e.g. hotels, fi 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. System parameters: Maintain a 20 degree difference between tankless set-point and desired tank temperature. Applicable models: Bosch 830 ES, 940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES, C 1210 ESC. Bosch Thermotechnology Corp. Data subject to change

34 THERM/GREENTHERM Tankless Water Heaters Applications Manual 13.4 Common Venting Up to 4 Greentherm C 950 ES and C 1050 ES or up to 4 Therm C 1210 ES/ESC can be common vented using the new polypropylene modular venting system. A vertical termination through a at or sloped roof and a horizontal termination through the side wall are available. Select from side by side or back to back conguration. Side by side: 2 units (1x Kit A) 3 units (1x Kit A + 1x Kit B) 4 units (1x Kit A + 2x Kit B) The Basic Kit A includes all needed parts for 2 appliances. Add one Extension Kit B for the third appliance, or two Extension Kit B for a total of four units. Back to back: 2 units (1x Kit C) 4 units (1x Kit C + 1x Kit D) The Basic Kit C covers the rst two appliances. The Extension Kit D covers both appliances three and four. Choose the vertical or horizontal termination, and as many rigid pipe pieces and elbows as needed, up to a maximum equivalent length of 100' (30m) between the last appliance and the termination. Equivalent length for 90 Elbow: 80" 45 Elbow: 40" Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 35 Tankless - Polypropylene Cascade Common Venting Venting System Part Number KIT A Cascade Kit Side by Side Basic Units 1 and 2 (2 heaters) 7736501100 KIT B Cascade Kit Extension Side by Side Units 3 and/or 4 (1 heater) 7736501254 KIT C Cascade Set Back to Back Basic Units 1 and 2 (2 heaters) 7736501253 KIT D Cascade Kit Extension Back to Back Units 3 and 4 (2 heaters) 7736501252 Horizontal Wall Terminal PP DIA6" 7736501117 Vertical Roof Terminal PP DIA6" 7736501119 Extension Rigid Pipe DIA6" x 80" 7736501133 Extension Rigid Pipe DIA6" x 40" 7736501135 Extension Rigid Pipe DIA6" x 20" 7736501137 Elbow DIA6" 90 7736501132 Elbow DIA6" 45 7736501146 Support Elbow DIA6" 7736501129 Extension Rigid Pipe DIA4" x 20" 7736501143 Extension Rigid Pipe DIA4" x 10" 7736501090 Elbow DIA4" 90 7736501141 Elbow DIA4" 45 7736501139 Chimney Connection DIA6" 7736501115 Wall Clamp DIA3" 7736501257 Wall Clamp DIA4" 7736501256 Wall Clamp DIA6" 7736501255 Flat Roof Flashing DIA6" 7736501095 PP Extension DIA4" 305 QF 7736501097 Steep Roof Flashing 0-25 DIA6" 7736501093 Steep Roof Flashing 25-45 DIA6" 7736501091 Wall Bracket DIA6" 7736501113 Bosch Thermotechnology Corp. Data subject to change

36 THERM/GREENTHERM Tankless Water Heaters Applications Manual Common venting with vertical or horizontal termination Schematic shows both vertical and horizontal setup. 45 and 90 elbows can be used as needed. The vent pipe must over its full length be sloped toward the water heaters and low points are not permitted. Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 37 Side by side conguration Back to back conguration Bosch Thermotechnology Corp. Data subject to change

38 THERM/GREENTHERM Tankless Water Heaters Applications Manual Data subject to change Bosch Thermotechnology Corp.

Applications Manual THERM/GREENTHERM Tankless Water Heaters 39 Bosch Thermotechnology Corp. Data subject to change

United States and Canada Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel: 866-330-2730 Fax: 603-965-7581 www.bosch-climate.us BTC 740001301 E / 03.2013