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H 29-3/4" x W 18-1/4" x D 8-3/4"
No Electricity Required
Pressure relief valve included
Vertical venting: 5" double-wall type B-vent pipe. Minimum vent height: 6'. Minimum rise 12" before elbow. Horizontal venting: AQ4 power vent accessory required.
Power Vent Option illustrating the side wall vent option that allows horizontal venting up to 100' and elimination of the chimney. Use the AQ4 Power Vent AQ4 for the Bosch GWH 425 HN (Part #AQ4).
Download Installation Manual (PDF) 
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Model/Product
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Energy Factor
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Annual Cost
to Operate*
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Annual
Savings¹
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Annual
Savings²
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635 ES/ESO
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0.80
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$250
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$110
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$151
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425 HN/HNO
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0.80
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$266
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$95
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$135
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425 EF
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0.78
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$273
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$88
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$129
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40-gallon tank
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0.59
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$361
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75-gallon tank
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0.53
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$410
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Installation Manual