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Appliance Details - Bosch Model GWH 425 User Manual

Indoor model flow modulated with standing pilot suitable for heating potable water only -
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2

Appliance details

2.1
GWH 425 PN specifications
(Technical data)
Approved in US/Canada
Capacity
GWH 425 PN: 4.3 GPM
Maximum output
GWH 425 PN: 91 525 Btu/hr
Maximum input
GWH 425 PN: 117 000 Btu/hr
Efficiency in %
Recovery efficiency 78%
Min. Output
GWH 425 PN: 23 906 Btu/hr
Gas Requirement
Gas connection (inches) - ¾" NPT
Inlet gas pressure under maximum operation*
• Propane: 10.5" - 14" water column
• Natural Gas: 5.7" - 14" water column.
* To measure Gas Pressure, see Measuring Gas
Pressure, chapter 3.8.
Venting
• Natural Draft
• Vent diameter (inches) - 5"
• Minimum height (feet) - 6' with no elbows
• Vertical termination
• Sidewall termination only with AQ4 power vent kit.
Water
• Hot water connection (inches) - ½" NPT
• Cold water connection (inches) - ½" NPT
• Water valve material: Polymer (PPS) (Polypropylene
Sulfid)
• Minimum water flow: 0.5 gallon/minute (1.9 l/m)
• Minimum recommended water pressure: 30 PSI
(2.07 bar)
• Connections:
– Bottom of heater
6 720 608 034
Dimensions
GWH 425 PN:
• Depth (in): 8.66" (220 mm)
• Width (in): 18.11" (460 mm)
• Height (in): 25.79" (655 mm)
• Weight: 35 pounds (16 kg).
Gas types
Natural Gas.
LP Gas
Safety devices
• Flame failure device (ionization flame rod sensor)
• Pressure relief valve (supplied with heater)
• Over heat prevention (temperature limiter).
Water resistant
IP X4.
Appliance details
3

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