Bosch Gwh 425 Ef - Bosch GWH 715 ES Applications Manual

Applications manual

2.7 Bosch GWH 425 EF

Features:
Electronic ignition and built in power vent
Thermal effi ciency of 82%
Vents with 4" stainless steel or galvanized vent pipe
Specifically designed for horizontal vent terminations
Modulating gas valve — ensures temperature
stability
Model GWH 425 EF N for natural gas (NG) supply
Model GWH 425 EF L for liquid propane (LP) supply
15-year warranty
Qualifi es for $300 tax credit (LP only)
GWH 425 EF Technical Specifi cations
Gas input Natural Gas: 28,000 - 130,000 Btu/h
LP Gas:
Minimum fl ow to 0.5 gallons per minute (GPM)
activate
Maximum fl ow rates 4.6 gpm @ 45°F rise
Thermal Effi ciency NG: 80%
Dimensions 29.75" h x 18.25" w x 8.75" d
Weight 44 lbs.
Modulating gas valve yes
Ignition Electronic
GWH 425 EF Installation Specifi cations
Gas connection
Water connections
NG gas pressure
LP gas pressure
Electrical supply
Venting
GWH 425 EF Installation Clearances
Top (A) 12"
Front (B) 4"
Back 0"
Sides 4"
Floor (C) 12"
Bosch Water Heating
28,000- 125,000 Btu/h
LP: 82%
½" Male NPT
½" Male NPT
Minimum: 7" W.C.
Maximum: 14" W.C.
Minimum: 11" W.C.
Maximum: 14" W.C.
120VAC - plugs in
4" stainless steel (AL29-4C)
or 26 gauge galvanized
Fig. 1 Venting confi gurations
Installation guidelines:
Venting:
4" AL29-4C sealed stainless steel or 26 gauge galvanized vent
pipe.
Slope horizontal runs up to termination ¼" per foot.
Do not combination vent with any other appliance.
See manual for vent terminator clearances.
Gas piping:
Heater will not function properly without adequate supply gas
pressure.
Any appliance connector should be ¾" minimum diameter
Plumbing:
Install the included pressure relief valve and pipe to suitable
drain.
Minimum piping diameter is ½".
Do not solder directly to connections on the bottom of the unit.
Use full port ball valves for isolation valves.
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Applications manual | 11.2007