Applications manual For tankless and point of use water heaters
| Applications manual Table of Contents 1 Introduction 3 2 Bosch Water Heating Models 3 2.1 Sizing tankless water heaters 2.2 Bosch GWH 715 ES 2.3 Bosch GWH C 800 ES 2.4 Outdoor Installation for GWH 715 ES and GWH C 800 ES 2.5 Bosch GWH 345 ESR 2.6 Bosch GWH 450 ESR 2.7 Bosch GWH 425 EF 2.8 Bosch GWH 425 HN 2.9 Bosch GWH 425 PN 2.10 Bosch GWH 260 PN 2.11 Powerstream Pro RP17PT, RP27PT 2.12 Powerstream Pro RP1P, RP2P, RP3P, RP7P, RP9P, RP12PT 2.13 Ariston Pro GL2.
Applications manual |3 1 Introduction The Bosch Applications Manual is intended to present some of the most common applications of the Bosch line of tankless and point of use 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 specific model number.
| Applications manual 2.1 Sizing tankless water heaters Definitions Major applications (2 GPM or more): Washing machine, bath tub, shower nozzle Minor applications(1.5 GPM or less): Low flow 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 instructions below in conjunction with the charts on the next page.
|5 Applications manual GPM 8 7 6 5 GWH C 8 800 ES 4 GWH 7 715 ES 3 GWH 4 425 PN/HN 2 GWH 2 260 PN/HN 1 0 10 20 30 40 50 60 70 80 90 Degree rise (°F) Gas Appliance Sizing Chart GPM 4.0 3.5 3.0 2.5 RP27PT P 2.0 1.5 RP17PT P 1.0 RP12PT P RP7P RP3P 3 RP1P P 0.5 RP9P P9P 0.0 10 20 30 40 50 60 70 80 90 Degree rise Electric Appliance Sizing Chart Note: Maximum flow rates dependant on site conditions Bosch Water Heating Applications manual | 11.
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|7 Applications manual 2.3 Bosch GWH C 800 ES Features: Electronic ignition and built in power vent Condensing technology with 92% thermal efficiency Vents vertically or horizontally with 3" or 4" PVC, CPVC or ABS (Schedule 40) vent pipe.
| Applications manual 2.4 Outdoor Installation for GWH 715 ES, and GWH C 800 ES Installation on wood siding Outdoor Kit (PTOK) installation: The installation of this outdoor kit (PTOK) is required when installing either of the above appliances outdoors Outdoor cap easily retrofits to these indoor models Outdoor kit comes with Freeze Prevention which must be installed Exterior water piping should be protected if freezing conditions could exist Minimum clearances: Installation on vinyl siding: Ref.
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| 17 Applications manual 2.13 Ariston Pro GL2.
| Applications manual 3 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 manufactures warranty covering the appliance. Introduction This chapter covers the various application techniques Bosch Water Heating recommends.
| 19 Applications manual 3.1.1 Ariston mini tank Simply tap into the cold water line and install the water heater directly at the sink. All models plug into a standard 120 volt outlet. Heater can be wall mounted, or sit on the floor. hot cold hot cold Ariston Pro GL2.
| Applications manual 3.1.2 Powerstream Pro electric point-of-use tankless water heater PowerstreamPro point-of-use water heaters come in four models to serve a wide range of applications. Finding the right model depends upon your desired temperature and flow rate. Use the table below to find the model best suited to your customer‘s needs. Flow controls and faucet aerators can greatly enhance performance. Note: Water heater must be filled with water and purged of air prior to supplying power.
| 21 Applications manual 3.1.3 Bosch GWH-260PN gas tankless water heater The Bosch GWH-260PN gas tankless water heater offers a compact and lightweight design for easy installation. This unit is equipped with standing pilot ignition and is intended for low volume applications.
| Applications manual 3.2 Whole house applications Whole house applications cover the typical home applications up to a 2 or 3 bedroom house. See the sizing guide (Section 2.1) 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. 3.2.
| 23 Applications manual 3.2.2 Powerstream Pro whole house application 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.
| Applications manual 3.2.3 Bosch ProTankless gas water heater Below are two examples of Bosch ProTankless gas water heater installations for the whole house. One example shows an Ariston mini tank in line for reduced hot water wait time and increased temperature stability. Bosch Bosch Bosch Bosch GWH GWH GWH GWH 715 ES, C 800 ES, 425 HN or 425 PN Hot Cold Ariston Pro GL4Ti for pipe runs over 100 ft, use GL8Ti Note: place Ariston close to the point of use to reduce wait time for hot water.
| 25 Applications manual 3.2.4 Bosch ProTankless 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.
| Applications manual 4 High Volume Potable Water Heating 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 manfuctures warranty covering the appliance.
| 27 Applications manual 4.1.1 Bosch ProTankless gas water heater in parallel for commercial applications Two Bosch ProTankless units will have double the activation rate of a single unit. When sizing gas line, ensure the gas line is sized to carry the BTU load of two units plus any additional gas appliances. See the installation manuals for a gas line sizing chart.
| Applications manual 4.2 Cascading unit applications A cascading application should be considered if the potential hot water demand exceeds the capacity of one GWH 715 ES or GWH C 800 ES. The cascading set up supports variable flow inputs and is designed for large homes and commercial applications. 4.2.1 GWH 715 ES and GWH C 800 ES cascading Cascading allows up to two appliances to be connected in parallel.
| 29 Applications manual 4.3 External storage tank loading applications. Introduction This section lays out tank loading options for high volume water heating for large residential and light commercial applications including continuous flows and high volume demands of large home and commercial applications. 4.3.1 GWH 345/450 ESR pressure drops and circulator guidelines The maximum amp draw for any circulator connected directly to the appliance must not exceed 1.
| Applications manual 4.3.2 Single unit tank loading application plumbing diagram The GWH 345/450 ESR is specifically designed for this application. Cold water DHW feed Bosch GWH 345 ESR, Bosch GWH 450 ESR PS Symbols Potable water expansion tank Pressure relief valve Bronze circulator sized according to UPC standards Service valves External storage tank Flow direction 12K ohm thermistor with immersion well Note: Piping to fixtures not shown for clarity purposes.
| 31 Applications manual 4.3.2 Single unit tank loading application electrical diagram The following shows the appropriate electrical connections for plumbing diagram 4.3.2 Terminal box 110VAC from outlet PK L N P0 LL PS N PE L ESR control board PS PCB Single Unit Tank Loading Electrical Diagram Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations. Additional safety and/or auxiliary equipment may be needed.
| Applications manual 5 Open Loop Space Heating 5.1 External storage tank Introduction This section is designed to provide a road map of techniques for using a tankless water heater to heat domestic water and at the same time provide space heating in residential applications. As with all installations, check with the local authority having jurisdiction. Some jurisdictions may not allow these types of applications. The appliances shown in this section are approved under ANSI Z21.10.3 and CSA 4.
| 33 Applications manual 5.1.1 Radiant space heating and DHW electrical diagram The following shows the appropriate electrical connections for plumbing diagram 5.1.
| Applications manual 5.1.2 Fan coil space heating and DHW plumbing diagram DHW Cold water feed Fan Coil Bosch GWH 345 ESR, Bosch GWH 450 ESR P1 PK Symbols Potable water expansion tank Air seperator Bronze circulator sized according to UPC standards Flow check valve Storage tank Fan Coil Pressure relief valve Thermostatic mixing valve Service valves Flow direction Tank Aquastat Note: Piping to fixtures not shown for clarity purposes.
| 35 Applications manual 5.1.2 Fan Coil space heating and DHW electrical diagram The following shows the appropriate electrical connections for plumbing diagram 5.1.
| Applications manual 5.1.3 Baseboard/ Radiant Panel space heating and DHW plumbing diagram DHW Cold water feed Bosch GWH 345 ESR, Bosch GWH 450 ESR P1 PK Symbols Potable water expansion tank Air seperator Bronze circulator sized according to UPC standards Flow check valve Pressure relief valve Thermostatic Mixing valve Flow direction Storage tank Baseboard/ Radiant Panel Tank Aquastat Service valves Note: Piping to fixtures not shown for clarity purposes.
| 37 Applications manual 5.1.3 Baseboard/Radiant Panel space heating and DHW electrical diagram The following shows the appropriate electrical connections for plumbing diagram 5.1.
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| 39 Applications manual 5.1.4 Baseboard/Radiant Panel space heating and DHW (with Ariston mini tank) electrical diagram The following shows the appropriate electrical connections for plumbing diagram 5.1.
| Applications manual 5.1.5 Baseboard/ Radiant Panel space heating and DHW (without storage tank) plumbing diagram Bosch GWH 345 ESR, Bosch GWH 450 ESR PK Insulate piping DHW PS Cold water feed Symbols Piping Insulation Bronze circulator sized according to UPC standards Flow check valve Flow direction Pressure relief valve Aquastat well & 12kohm thermistor Thermostatic mixing valve Service valves Baseboard/ Radiant Panel Note: Piping to fixtures not shown for clarity purposes.
| 41 Applications manual 5.1.5 Baseboard/Radiant Panel space heating and DHW (without storage tank) electrical diagram The following shows the appropriate electrical connections for plumbing diagram 5.1.5 Terminal box 110VAC from outlet PK L N P0 LL PS N PE L ESR control board PK PS PCB Baseboard/Radiant Panel Space Heating and DHW Without Storage Tank Electrical Diagram Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
| Applications manual 5.2 Indirect Tank Applications 5.2.1 Indirect Baseboard/ Radiant Panel space heating and DHW plumbing diagram Note: Not suitable for space heating applications requiring high water temperature.
| 43 Applications manual 5.2.1 Baseboard/Radiant Panel space heating and DHW electrical diagram The following shows the appropriate electrical connections for plumbing diagram 5.2.
| Applications manual 6 Maintenance Drawings Bosch appliances are designed to last for many years. In order to keep the heater operating properly, periodic maintenance is required. Please consult the installation manual for maintenance intervals. A descaling procedure drawing is included to assist in clearing the water heater of mineral deposits that may build up over time. 6.
| 45 Applications manual 6.1 Descaling procedure diagram Bosch Bosch Bosch Bosch GWH GWH GWH GWH 715 ES, C 800 ES, 425 HN or 425 PN Symbols Circulating pump B Flow direction C A Filter Service valves Note: This drawing is conceptual in nature and does not purport to address all design, installation or safety considerations. Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
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BBT North America Corporation Bosch Group Bosch Water Heating 50 Wentworth Ave Londonderry, NH 03053 Telephone (603) 882-1100 Fax (603) 584-1681 www.protankless.com techsupport@protankless.
