Bosch GWH 345 ESR Applications Manual
Tankless water heaters
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Summary of Contents for Bosch GWH 345 ESR
- Page 1 Applications manual For GWH 345 ESR and GWH 450 ESR tankless water heaters...
- Page 2 GWH 345/450 ESR applications manual BOSCH THERMOTECHNOLOGY CORPORATION Application manual | 02.2009...
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Page 3: Table Of Contents
GWH 345/450 ESR applications manual Table of Contents 1 Introduction 2 Bosch Water Heating Models 2.1 Bosch GWH 345 ESR 2.2 Bosch GWH 450 ESR 3 External storage tank loading applications 3.1 GWH 345/450 ESR pressure drops & circulator guidelines 3.2 Tank loading diagrams... -
Page 4: Introduction
1 Introduction The Applications Manual is intended to present some of the most common applications of the Bosch GWH 345 ESR and GWH 450 ESR tankless water heaters. Application drawings are shown with both piping and corresponding electrical schematics where applicable. -
Page 5: Bosch Water Heating Models
Direct vent room-sealed combustion Computerized temperature control — ensures temperature stability Model GWH 345 ESR N for natural gas (NG) supply Model GWH 345 ESR L for liquid propane (LP) supply 10-year warranty on heat exchanger GWH 345 ESR Technical Specifi cations... -
Page 6: Bosch Gwh 450 Esr
GWH 345/450 ESR applications manual 2.2 Bosch GWH 450 ESR Features: Specifi cally designed for recirculating applications Electronic ignition and built in power vent GWH 450 ESR thermal effi ciency of 81% Vents vertically or horizontally with 3" stainless steel (AL29-4C) Direct vent room-sealed combustion Computerized temperature control —... -
Page 7: External Storage Tank Loading Applications
Circulator should be sized by the professional plumbing contractor Bronze or stainless steel circulators are required for all open loop applications 30 feet of head GWH 345 ESR 20 feet of head 10 feet of head 0 feet of head 0 GPM... -
Page 8: Tank Loading Diagrams
GWH 345/450 ESR applications manual 3.2 Tank Loading diagrams 3.2.1 Single unit tank loading application plumbing diagram The GWH 345/450 ESR is specifi cally designed for this application Cold water feed Bosch GWH 345 ESR, Bosch GWH 450 ESR Symbols External Potable water Pressure... - Page 9 Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale. Drawing # ESTL revA 10/07 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
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Page 10: Open Loop Space Heating
Some jurisdictions may not allow these types of applications. 4.1.1 Radiant space heating and DHW plumbing diagram Bosch GWH 345 ESR, Bosch GWH 450 ESR Cold water feed... - Page 11 Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale. Drawing # EROL revA 10/07 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
- Page 12 1 2 | GWH 345/450 ESR applications manual 4.1.2 Fan coil space heating and DHW plumbing diagram Bosch GWH 345 ESR, Bosch GWH 450 ESR Cold water Fan Coil feed Symbols Potable water Flow Storage expansion tank check tank Fan Coil...
- Page 13 Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale. Drawing # EFCOL revA 10/07 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
- Page 14 1 4 | GWH 345/450 ESR applications manual 4.1.3 Baseboard/ Radiant Panel space heating and DHW plumbing diagram Bosch GWH 345 ESR, Bosch GWH 450 ESR Cold water feed Symbols Potable water Flow Flow Storage Baseboard/ expansion tank check direction...
- Page 15 Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale. Drawing # EBBOL revA 10/07 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
- Page 16 1 6 | GWH 345/450 ESR applications manual 4.1.4 Baseboard/ Radiant Panel space heating and DHW (with Ariston mini tank) plumbing diagram Bosch GWH 345 ESR, Bosch GWH 450 ESR Cold water feed Aquastat well with 12k ohm thermistor (insulate piping...
- Page 17 Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale. Drawing # EBBAOL revA 10/07 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
- Page 18 1 8 | GWH 345/450 ESR applications manual 4.1.5 Baseboard / Radiant Panel space heating and DHW (without storage tank) plumbing diagram Bosch GWH 345 ESR, Bosch GWH 450 ESR Cold water feed Insulate piping Symbols Flow Baseboard/ Flow Radiant...
- Page 19 Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale. Drawing # BBNTOL revA 10/07 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
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Page 20: Indirect Tank Applications
GWH 345/450 ESR applications manual 4.2 Indirect Tank Applications 4.2.1 Indirect Baseboard/ Radiant Panel space heating and DHW plumbing diagram Note: Not suitable for space heating applications requiring high water temperature. Bosch GWH 345 ESR, Bosch GWH 450 ESR Cold water feed... - Page 21 Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers. It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale. Drawing # EID BBOL revA 10/07 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
- Page 22 2 2 | GWH 345/450 ESR applications manual BOSCH THERMOTECHNOLOGY CORPORATION Application manual | 02.2009...
- Page 23 GWH 345/450 ESR applications manual | 23 BOSCH THERMOTECHNOLOGY CORPORATION Applications manual | 02.2009...
- Page 24 BOSCH THERMOTECHNOLOGY CORPORATION 50 Wentworth Ave Londonderry, NH 03053 Telephone (603) 552-1100 Fax (603) 584-1681 www.boschpro.com BTC 716001101 A | 02.2009...