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Appliance Details - Bosch Pro Tankless GWH-425-HNO-N Instructions For Use Manual

Gwh 425 hno outdoor model for exterior use only
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Appliance details

2
Appliance details
2.1
Features
• Burner output proportional to hot water flow demand
for maximum energy efficiency
• Stainless steel burners with stabilized blue flame
• Built-in corrosion resistant draft diverter
• Adjustable water flow restrictor to ensure that water
flow demand will not exceed the heating capacity of
the heater
• Safety flame sensor at pilot burner
• Automatic overheating protection shut-off sensor
• Copper heating coils for endless supply of hot water
• Easily removable one-piece cover
• Easy one person installation
• Electronic Pilot Ignition driven by hydro-generator.
BOSCH is constantly improving its
i
products, therefore specifications are
subject to change without prior notice.
2.2
GWH-425-HNO specifications
(Technical data)
Approved in US/Canada
Capacity
Maximum flow rate: 3.7 GPM (14 l/min) at a 45°F
(25°C) rise.
Maximum output
101,772 Btu/h (29.8 kW)
Maximum input
117,000 Btu/h (34.3 kW)
Efficiency in %
Recovery efficiency 80%
Min. Output
28,000 Btu/h (8.2 kW)
Gas Requirement
Gas connection (inches) - ¾"
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 3.6.
Water
• Hot water connection (inches) - ½"
• Cold water connection (inches) - ½"
4
• 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
Dimensions
• Depth (in): 10.5" (265 mm)
• Width (in): 18.25" (460 mm)
• Height (in): 36.75" (936 mm)
• Weight: 64 pounds (29 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 X5 (protection against water drops).
8 716 473 148

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