Bosch GWH 425 EF User Manual

10 6 720 607 017Fig 5: Side wall exit locations for mechanical draft vent terminalsSOFFITVENT HOOD7’ MINIMUM ABOVEPUBLIC WALKWAYONE FOOTABOVE GRADE3’

116 720 607 017Fig. 6 - Appliance pressure regulator(with directional arrow on reverse side pointing up)GAS LINE SIZINGThe pressure regulator provided

12 6 720 607 017GAS PIPING, CONNECTIONSBefore connecting the gas supply, check the rating plate on the right side of the front cover to be sure that t

136 720 607 017Fig.7 - Water valve and water connectors, top viewWATER CONNECTIONSInstall the heater centrally in the building if possible andmake hot

14 6 720 607 017ELECTRICAL CONNECTIONSWARNING: For safety reasons, disconnect the power supply to the heater before any service or testing is per

156 720 607 017OPERATING INSTRUCTIONSBefore operating the heater, make sure that the system isfilled with water.Open the cold water inlet supply to th

16 6 720 607 017Fig. 12 - Characteristic Pilot FlameFlame sensorPiezoElectrodeWater Valve (Part # 8707002802): The water valve onthis heater shou

176 720 607 0173. Water flow is not sufficient to activate heater.Water flow rate at faucet is below minimum flow needed toactivate heater. When tempe

18 6 720 607 017Mineral deposits can eventually (3-5 years in hard waterareas) corrode the water valve parts to a point where theywill need replacing.

196 720 607 017WATER IS TOO HOT1. Temperature Selection too highTurn the temperature adjustment knob counter-clockwise(to the left) to lower the maxim

2 6 720 607 017WARNING: Improper installation,adjustment, alteration, service or maintenance can causeinjury or property damage. Refer to this

20 6 720 607 017Fig. 15 - Diagram of 425 EF1. Heat exchanger2. Pilot assembly3. Burner manifold gaspressure test nipple4. Main gas burner5. Pilot gas

216 720 607 017Fig. 16 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST

22 6 720 607 017Fig. 16INTERIOR COMPONENTS DIAGRAMAND PARTS LIST 425 EF1 Cover 8 705 421 7752Temperature adjustment knob 8 702 000 1113 Temperature ad

236 720 607 017Fig. 17 - Flow chart of 425 EF

24 6 720 607 017Fifteen Year Limited WarrantyGeneralBOSCH PRO water heaters are warranted by theManufacturer (BOSCH) through Controlled Energ

256 720 607 017

VULCANO Termodomésticos S.A.Estrada de Cacia3801 - 856 Aveiro - PORTUGALRecycled paper© 2003 Controlled Energy Corporation, Waitsfield, VT all rightsr

36 720 607 017425 EF LP and 425 EF NG SpecificationsWater Connection 1/2” Thread fitting NPTH x W x D 29 3/4” x 18 1/4” x 8 3/4"Vent 4”Gas Conne

4 6 720 607 017MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NONCOMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONSFRONT VIEW SIDE VIEWMOD

56 720 607 017GENERAL RULES TO FOLLOWFOR SAFE OPERATION1. You should follow these instructions when you install yourheater. In the United States: The

6 6 720 607 017COMBUSTION AIR REQUIREMENTSThe 425 EF water heater holds cold water in its copperheat exchanger and brass water valve when not in use.B

76 720 607 017Fig. 3 - Incandescent Particle Tray IllustrationThe incandescent particle tray (shipped loose in the cartonwith the water heater) must b

8 6 720 607 017VENTINGWARNING: Do not reduce the vent pipe size anddo not common vent with any other vented appliance orstove.This appliance must be v

96 720 607 017Fig 4: Some Venting Guide SuggestionsAn approved side wall vent terminal must be used when the water heater is vented through a sidewall