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Manual Bosch Appliances GWH 425 PN/HN4GWH 4254

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  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 1

    Applications manual F or tankless and point of use wat er heat ers ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 2

    2 | Applications manual Application manual | 11.2007 Bosch Wat er Heating T able of Contents 1 Introduction 3 2 Bosch Wat er Heating Models 3 2.1 Sizing tankless water heaters 4 2.2 Bosch GWH 715 ES 6 2.3 Bosch GWH C 800 ES 7 2.4 Outdoor Installation for G WH 715 ES and GWH C 800 ES 8 2.5 Bosch GWH 345 ESR 9 2.6 Bosch GWH 450 ESR 10 2.7 Bosch GWH 4 ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 3

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 3 1 Introduction The Bosch Applications Manual is int ended to present some of t he most common applications of the Bosch line of tankless and point of use wat er heaters. Application dra wings are shown with bo th piping and corresponding electrical schematics where applicabl ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 4

    4 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 2.1 Sizing tankless water heaters De fi nitions  Major applications (2 GPM or mor e): Washing machine, bath tub, shower nozzle  Minor applications(1.5 GPM or less): L ow fl ow show er head, bathroom sink, kitchen sink Rule of thumb sizing The tables below pro vide a g ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 5

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 5 0 1 2 3 4 5 6 7 8 GWH 425 PN/HN 4 GWH 425 4 GWH 260 PN/HN 2 10 20 30 40 50 60 70 80 90 Degree rise (°F) GPM G as App l iance Sizing C h ar t GWH 715 ES 7 GWH C 800 ES C GWH C 8 C 0 . 0 0 . 5 1. 0 1. 5 2 . 0 2 . 5 3 . 0 3 . 5 4. 0 RP27PT P 10 20 30 40 50 60 70 80 90 Degree r ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 6

    6 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 2.2 Bosch GWH 715 ES F eatures:  Electronic ignition and built in pow er vent  82% thermal ef fi ciency  Vents v er tically or horizontally with 3" or 4" stainless st eel (AL29- 4C)  Direct vent r oom-sealed combustion  Comput erized temperatur e con ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 7

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 7 2.3 Bosch GWH C 800 ES F eatures:  Electronic ignition and built in pow er vent  Condensing tec hnology with 92% thermal ef fi ciency  Vents v er tically or horizontally with 3" or 4" PVC, CPV C or ABS (Schedule 40) vent pipe.  Direct vent r oom-sealed ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 8

    8 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 2.4 Outdoor Installation for G WH 715 ES, and GWH C 800 ES Outdoor Kit (PTOK) installation:  The installation of this outdoor kit (PT OK) is required when installing either of the abov e appliances outdoors  Outdoor cap easily retr o fi ts to these indoor models  Ou ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 9

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 9 2.6 Bosch GWH 345 ESR F eatures:  Speci fi cally designed for recir culating applications  Electronic ignition and built in pow er vent  GWH 345 ESR thermal ef fi ciency of 82%  Vents v er tically or horizontally with 3" stainless st eel (AL29-4C)  Dire ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 10

    10 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 2.6 Bosch GWH 450 ESR F eatures:  Speci fi cally designed for recir culating applications  Electronic ignition and built in pow er vent  GWH 450 ESR thermal ef fi ciency of 81%  Vents v er tically or horizontally with 3" stainless st eel (AL29-4C)  Dire ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 11

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 11 2.7 Bosch GWH 425 EF F eatures:  Electronic ignition and built in pow er vent  Thermal ef fi ciency of 82%  Vents wit h 4" stainless steel or galvanized vent pipe  Specifically designed for horizontal vent t erminations  Modulating gas valve — ensures ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 12

    12 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 2.8 Bosch GWH 425 HN F eatures:  Hydro-generat ed ignition  80% thermal ef fi ciency  Endless hot wat er for one major application at a time  Venting: 5" double w all B-vent — natural draft  Modulating gas valve — constant t emperature at varying f l ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 13

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 13 2.9 Bosch GWH 425 PN F eatures:  Standing pilot ignition  78% thermal ef fi ciency  Endless hot wat er for one major application at a time  Modulating gas valve — constant t emperature at varying f low rat es  Model GWH 425 PN N for natural gas (NG) supply ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 14

    14 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 2.10 Bosch GWH 260 PN F eatures:  Standing pilot ignition  78% thermal ef fi ciency  Mounts on wall for easy installation  Venting: 4" double w all B-vent — natural draft  Modulating gas valve — constant t emperature at varying f low rat es  Model ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 15

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 15 2.11 Po werstream Pro RP17PT , RP27PT F eatures:  Over 90% ef fi ciency rating  10-year warranty on heat ex changer  Durable polymer construction  External t emperature contr ol knob  Thermal cut-out for saf ety  Flow sensor t o provide a constant output ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 16

    16 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 2.12 Po werstream P r o RP1P , RP2P , RP3P , RP7P , RP9P ,RP12PT F eatures:  5-year warranty on heat ex changer  Saves space  Installs vertically or horizontally (Model RP12PT only installs horizontally)  All models must be hardwired  Solid copper heat ex chan ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 17

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 17 2.13 Ariston Pro GL2.5Ti, GL4Ti, GL8Ti F eatures:  Point of use mini tank  3 models  Adjustable thermostat with thermal cut-out  Dielectric isolation on inlet/outlet connections  Units can be wall hung (brack et included) or fl oor mounted  Durable poly-c ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 18

    18 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 3 Domestic Wat er Heating Applications Potable wat er Potable w ater is wat er that is suitable f or drinking. Bosch Wat er Heating appliances are appro ved to heat po table water onl y. Heating any o ther liquid other than po table water will v oid the manufactures warranty ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 19

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 19 3.1.1 Ariston mini tank Simply tap int o the cold wat er line and install the water heat er directly at the sink. All models plug int o a standard 120 volt outle t. Heater can be w all mounted, or sit on the fl oor . Symbols T emperature and pr essure relief valv e Drain p ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 20

    20 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 3.1.2 Pow erstream Pro electric point-of-use tankless water heat er Pow erstreamPr o point-of-use water heat ers come in four models t o ser ve a wide range of applications. Finding the right model depends upon your desired t emperature and fl ow rate. Use the table belo w ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 21

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 21 3.1.3 Bosch GWH-260PN gas tankless water heat er The Bosch GWH-260PN gas tankless wat er heater offers a compact and lightweight design f or easy installation. This unit is equipped with standing pilot ignition and is intended f or low volume applications. Symbols T emperat ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 22

    22 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 3.2 Whole house applications Whole house applications cover the typical home applications up t o a 2 or 3 bedroom house. See the sizing guide (Section 2.1) t o det ermine the best Bosch wat er heater model f or your application. An enhanced design including an Ariston mini t ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 23

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 23 3.2.2 Pow erstream Pro whole house application with domestic recirculation loop The circulat or should be controlled by an e xternal aquastat, or with a timer to run only during times of e xpected ho t water usage. Symbols Ser vice valves Sink Not e: This drawing is concep ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 24

    24 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 3.2.3 Bosch Pro T ankless gas water heater Below are tw o exam ples of Bosch Pro T ankless gas water heater installations for the whole house. One e xample sho ws an Arist on mini tank in line for r educed hot wat er wait time and increased tem perature stability . Symbols S ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 25

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 25 3.2.4 Bosch Pro T ankless gas water heater with domestic recirculation loop The circulat or should be controlled by an e xternal aquastat, or with a timer to run only during times of e xpected ho t water usage. Symbols Sink Not e: This drawing is concep tual in nature and d ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 26

    26 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 4 High V olume Potable W ater Heating Potable wat er Potable w ater is wat er that is suitable f or drinking. Bosch Wat er Heating appliances are appro ved to heat po table water onl y. Heating any o ther liquid other than po table water will v oid the manfuctures warranty c ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 27

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 27 4.1.1 Bosch Pro T ankless gas water heater in parallel for commercial applications T wo Bosch Pro T ankless units will have double the activation rate of a single unit. When sizing gas line, ensure the gas line is sized t o carr y the BTU load of two units plus an y additio ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 28

    28 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 4.2 Cascading unit applications A cascading application should be considered if the pot ential hot wat er demand exceeds t he capacity of one GWH 715 ES or GWH C 800 ES. The cascading set up supports variable fl ow inputs and is designed for large homes and commer cial appl ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 29

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 29 4.3 External storage tank loading applications. Introduction This section lay s out tank loading options for high v olume water heating for large r esidential and light commercial applications including continuous fl ows and high v olume demands of large home and commercia ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 30

    30 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 4.3.2 Single unit tank loading application plumbing diagram The GWH 345/450 ESR is speci fi cally designed for this application. Symbols Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety considerations. Additional safety a ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 31

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 31 4.3.2 Single unit tank loading application electrical diagram The follo wing shows the appr opriate electrical connections f or plumbing diagram 4.3.2 Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety considerations. Addit ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 32

    32 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 5 Open Loop Space Heating Introduction This section is designed to pr ovide a road map of t echniques f or using a tankless wat er heater t o heat domestic water and at t he same time provide space heating in r esidential applications. As with all installations, check with t ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 33

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 33 5.1.1 Radiant space heating and DHW electrical diagram The follo wing shows the appr opriate electrical connections f or plumbing diagram 5.1.1 Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety considerations. Additional s ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 34

    34 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 5.1.2 F an coil space heating and DHW plumbing diagram Symbols Not e: This drawing is concep tual in nature and does to addr ess all design, installation or safety considerations. Additional safety and/or auxiliary equipment may be needed. This diagram is f or reference use ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 35

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 35 5.1.2 F an Coil space heating and DHW electrical diagram The follo wing shows the appr opriate electrical connections f or plumbing diagram 5.1.2 Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety considerations. Additional ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 36

    36 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 5.1.3 Baseboard/ Radiant Panel space heating and DHW plumbing diagram Symbols Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety considerations. Additional safety and/or auxiliary equipment may be needed. This diagram is f o ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 37

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 37 5.1.3 Baseboard/Radiant Panel space heating and DHW electrical diagram The follo wing shows the appr opriate electrical connections f or plumbing diagram 5.1.3 Not e: This drawing is concep tual in nature and does not purport to address all design, installation or saf ety c ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 38

    38 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 5.1.4 Baseboard/ Radiant Panel space heating and DHW (with Ariston mini tank) plumbing diagram Symbols Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety considerations. Additional safety and/or auxiliary equipment may be ne ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 39

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 39 5.1.4 Baseboard/Radiant Panel space heating and DHW (with Ariston mini tank) electrical diagram The follo wing shows the appr opriate electrical connections f or plumbing diagram 5.1.4 Not e: This drawing is concep tual in nature and does not address all design, installatio ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 40

    40 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 5.1.5 Baseboard/ Radiant Panel space heating and DHW (without storage tank) plumbing diagram Symbols Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety considerations. Additional safety and/or auxiliary equipment may be need ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 41

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 41 5.1.5 Baseboard/Radiant Panel space heating and DHW (without storage tank) electrical diagram The follo wing shows the appr opriate electrical connections f or plumbing diagram 5.1.5 Not e: This drawing is concep tual in nature and does not address all design, installation ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 42

    42 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 5.2 Indirect T ank Applications 5.2.1 Indirect Baseboard/ Radiant Panel space heating and DHW plumbing diagram Note: No t suitable for space heating applications requiring high w ater t emperature. Symbols Not e: This drawing is concep tual in nature and does not address all ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 43

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 43 5.2.1 Baseboard/Radiant Panel space heating and DHW electrical diagram The follo wing shows the appr opriate electrical connections f or plumbing diagram 5.2.1 Not e: This drawing is concep tual in nature and does not address all design, installation or saf ety consideratio ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 44

    44 | Applications manual Application manual | 11.2007 Bosch Wat er Heating 6 Maintenance Drawings Bosch appliances are designed t o last for man y years. In order t o k eep the heater operating pr operly , periodic maintenance is r equired. Please consult the installation manual for maint enance intervals. A descaling procedure drawing is included ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 45

    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 45 6.1 Descaling procedure diagram Symbols Ser vice valves Not e: This drawing is concep tual in nature and does not purport to address all design, installation or saf ety considerations. Additional safety and/or auxiliary equipment may be needed. This diagram is f or referenc ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 46

    46 | Applications manual Application manual | 11.2007 Bosch Wat er Heating ...

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    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 47 ...

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    48 | Applications manual Application manual | 11.2007 Bosch Wat er Heating ...

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    Applications manual | 11.2007 Bosch Wat er Heating Applications manual | 49 ...

  • Bosch Appliances GWH 425 PN/HN4GWH 4254 - page 50

    BBT North America Corpor ation Bosch Group Bosch W ater Heating 50 Wentw or th Ave Londonderry, NH 03053 T elephone (603) 882-1100 F ax (603) 584-1681 www.pr otankless.com techsupport@protankless.com ...

Manufacturer Bosch Appliances Category Water Heater

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