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Bosch Appliances GWH 425 EF - page 1
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Bosch Appliances GWH 425 EF - page 2
2 6 720 607 017 WARNING : Improper installation, adjustment , alterat ion, service or maint enance can c ause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or t he gas supplier. Upon completion of the installation, these instructions should be handed to the us ...
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Bosch Appliances GWH 425 EF - page 3
3 6 720 607 017 425 EF LP and 425 EF NG Specifications W ater Connection 1 /2” T hread fitting N PT H x W x D 29 3/ 4” x 1 8 1 /4” x 8 3/4" V ent 4” Gas C onnection 1 /2” N PT thread Min. W ater Pressure 1 8 Psi Max. W ater Pressure 1 50 Psi Shipping W eight 50.6 LB Net W eight 44 LB 2.0 G PM at 90 ° rise 4.0 G PM at 45 ° rise Min. ...
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Bosch Appliances GWH 425 EF - page 4
4 6 720 607 017 M I N I M U M I NST ALLA TI ON C LE ARAN C E S F R OM C O M B U S TI B LE AN D N ON C OM B USTI B LE MA TE R IAL S F OR AL C O VE O R C L O S ET I N S T ALLA TI O NS FR ONT VI EW S ID E VI E W MOD EL 425 E F * On a combustible wall surface the unit should be mounted away from the wall to provide adequate clearance of the vent pipe. ...
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Bosch Appliances GWH 425 EF - page 5
5 6 720 607 017 GE NE RA L RU L ES T O FOL L OW FOR SAFE OP ER A TIO N 1. Y ou should follow these instructions when you install your heater. In the United States : The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code AN SI Z223. 1 / NF P A 54. In Canada: The Installation should conform with C ...
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Bosch Appliances GWH 425 EF - page 6
6 6 720 607 017 COMBUSTION AIR REQUIREMENTS T he 425 E F water heater holds cold water in its copper heat exchanger and brass water valve when not in use. Because of this, any cold air that comes in through the unit’s vent pipe is capable of freezing these components. This Installation Manual specifies the vent length requirements and the amount ...
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Bosch Appliances GWH 425 EF - page 7
7 6 720 607 017 Fig . 3 - Inc andescent Part icle T ray Illust rat ion The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use the screws provided. See figure 3. SCREWS INCANDESCENT P ARTICLE TRA Y Fig. 2 - Mounting the Heater ...
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Bosch Appliances GWH 425 EF - page 8
8 6 720 607 017 VENTING WARNING: Do not reduce the vent pipe size and do not common vent with any other vented appliance or stove. This appliance must be vented horizontally to the outside with a sealed 4” single wall vent pipe. The appliance’s flue gasses are under positive pressure and must travel through a single wall 4” pipe that is seale ...
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Bosch Appliances GWH 425 EF - page 9
9 6 720 607 017 Fig 4 : Some V enting Guide Suggest ions An approved side wall vent terminal must be used when the water heater is vented through a side wall . Locate in accordance with AN SI Z223. 1 and local applicable codes. See Fig 5 for restrictions in location of vent terminal in relation to opening doors and windows, grade, and forced air in ...
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Bosch Appliances GWH 425 EF - page 10
10 6 720 607 017 Fig 5: Side wall exit locations for mechanical draft vent terminals SOFFIT VENT HOOD 7’ MINIMUM ABOVE PUBLIC WALKWA Y ONE FOOT ABOVE GRADE 3’ ABOVE ANY FORCED AIR INLET WITHIN 10’ 4’ MIN 1’ MIN 4’ MIN 4’ MIN 4’ MIN 1’ MIN VENT HOOD MUST BE MOUNTED FOUR FEET AW AY FROM DOORS AND WINDOWS VENT HOOD MUST BE MOUNTED FO ...
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Bosch Appliances GWH 425 EF - page 11
11 6 720 607 017 Fig. 6 - Appliance pressure regulator (with directional arrow on reverse side pointing up) GAS LINE SIZING The pressure regulator provided with the heater is adjusted to deliver the proper gas pressure (as indicated on the rating plate and in the manual for altitude up to 2000 feet (660 meters) above sea level. On appliances being ...
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Bosch Appliances GWH 425 EF - page 12
12 6 720 607 017 GAS PIPING, CONNECTIONS Before connecting the gas supply , c hec k the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected. In the United St ates: T he installation must conform with local codes or, in the absence of local codes, the National Fuel Gas ...
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Bosch Appliances GWH 425 EF - page 13
13 6 720 607 017 Fig.7 - Water valve and water connectors, top view W A TER C ONNE C TI ONS Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater , the cold water inlet will be on the right and the hot water outlet on the left.. Although water piping throughout the buildi ...
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Bosch Appliances GWH 425 EF - page 14
14 6 720 607 017 ELECTRICAL CONNECTIONS WARNING: For safety reasons, disconnect the power supply to the heater before any service or testing is performed. WARNING: This heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code , NF P A 7 0. In C anada, all electrical wiring to the heater should ...
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Bosch Appliances GWH 425 EF - page 15
15 6 720 607 017 O PERA TIN G INST RU CT IONS Before operating the heater , make sure that the system is filled with water. Open the cold water inlet supply to the heater fully . Open a hot water faucet to permit the water to fill the heater and the piping and to eliminate the air trapped in the system Close the hot water faucet after the water flo ...
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Bosch Appliances GWH 425 EF - page 16
16 6 720 607 017 Fig. 1 2 - Characterist ic Pilot Flame Flame sensor Piezo Electrode W at e r V alve (Part # 8 7070 0 28 02): The water valve on this heater should be ser viced periodically . Lubricate component #36 on page 2 1 with a small amount of silicon, faucet or lithium grease every two years to keep its o rings fresh and pushrod sliding smo ...
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Bosch Appliances GWH 425 EF - page 17
17 6 720 607 017 3. Wat er flow is not sufficient to act ivat e heat er . W ater flow rate at faucet is below minimum flow needed to activate heater . W hen temperature adjustment knob is turned all the way clockwise, the model 425 E F requires 1 /2 gallon per minute flow to activate the heater . As a reference, this is a flow which would fill a qu ...
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Bosch Appliances GWH 425 EF - page 18
18 6 720 607 017 Mineral deposits can eventually (3-5 years in hard water areas) corrode the water valve parts to a point where they will need replacing. Any sign of moisture at the bleed hole is a sign that the water valve needs to be replaced immediat ely . 1 0. Poor circuit connections at the E CO ( overheat sensor) or the flue gas safety device ...
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Bosch Appliances GWH 425 EF - page 19
19 6 720 607 017 WA TE R I S T O O H O T 1 . T emperat ure Selection t oo high T urn the temperature adjustment knob counter-clockwise (to the left) to lower the maximum water temperature. Note: This will increase the activation flow rate. 2 . Inlet water temperature is very warm (60°-75°F) Reduce inlet gas supply to lower the heaters degree rise ...
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Bosch Appliances GWH 425 EF - page 20
20 6 720 607 017 Fig. 1 5 - Diagram of 425 E F 1 . Heat exchanger 2. Pilot assembly 3. Burner manifold gas pressure test nipple 4. Main gas burner 5. Pilot gas tubing 6. Gas valve 7 . electric control box 8. Power cord 9. on/off switch 1 0. T emperature adjustment selector 1 1 . Microswitch 1 2. Gas inlet gas pressure test nipple 1 3. Exhaust Fan 1 ...
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Bosch Appliances GWH 425 EF - page 21
21 6 720 607 017 Fig . 1 6 - I NTE R IOR COM PON E NTS DIAGR AM AN D P ARTS LI ST ...
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Bosch Appliances GWH 425 EF - page 22
22 6 720 607 017 Fig . 1 6 INTERIOR COMPONENTS DIAGRAM AN D P ARTS LI ST 425 EF 1 Cover 8 705 421 775 2T e m p era tur e ad j ustment kno b 8 702 000 111 3 Te m p era tur e ad j ustment co l lar 8 700 403 008 4 Dra ft diverter 8 705 505 451 5 He at exch an g er 8 705 406 235 6 Overheat se n sor (ECO) 8 707 206 040 7 Main burner 8 708 120 298 NG 7 M ...
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Bosch Appliances GWH 425 EF - page 23
23 6 720 607 017 Fig . 1 7 - Flow chart of 425 E F ...
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Bosch Appliances GWH 425 EF - page 24
24 6 720 607 017 Fift een Y ear Limit ed W arrant y General B OSC H P RO water heaters are warranted by the Manufacturer ( BO SC H ) through Controlled Energy C orp. Controlled Energy Corp. ( CE C ) will furnish a replacement heat exchanger and will furnish a replacement of any other part which fails in normal use and service within the applicable ...
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Bosch Appliances GWH 425 EF - page 25
25 6 720 607 017 ...
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Bosch Appliances GWH 425 EF - page 26
VU L C ANO T ermodomésticos S.A . Estrada de Cacia 38 0 1 - 856 Aveiro - PO RTUGAL Recycled paper © 2003 C ontrolled Energy Corporation, W aitsfield , VT all rights reserved Replacement Parts available from North American Distributor CO NTRO LLED E NE R G Y CO RP . 340 Mad River Park Waitsfield , V ermont 05 6 7 3 Phone 86 6-330-27 3 0 Fax (802) ...
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