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Applications manual | 11.2007Bosch Water Heating
Applications manual
| 9
2.6 Bosch GWH 345 ESR
Features:
Specifi cally designed for recirculating applications
Electronic ignition and built in power vent
GWH 345 ESR thermal effi ciency of 82%
Vents vertically or horizontally with 3" stainless steel (AL29-4C)
Direct vent room-sealed combustion
Computerized temperature control — ensures temperature
stability
Model GWH 345 ESR N for natural gas (NG) supply
Model GWH 345 ESR L for liquid propane (LP) supply
10-year warranty
GWH 345 ESR Technical Specifi cations
Gas input GWH 345 ESR: 32,000 - 95,000 Btu/h
Maximum fl ow rates GWH 345 ESR: 3.5gpm @ 45°F rise
Thermal Effi ciency 82%
Dimensions 27.5" h x 15.75" w x 11.75" d
Weight 47 lbs.
Modulating gas valve yes
Ignition Electronic
GWH 345 ESR Installation Specifi cations
Gas connection ¾" Male NPT
Water connections ¾" Male NPT
NG gas pressure Minimum: 5.5" W.C.
Maximum: 14" W.C.
LP gas pressure Minimum: 11" W.C.
Maximum: 14" W.C.
Electrical supply 120VAC - plugs in
Venting 3" stainless steel (AL29-4C)
direct vent
room-sealed combustion
GWH 450 ESR Installation Clearances
Top (A) 12"
Front (B) 1"
Back 0"
Sides 1"
Floor (C) 12"
Fig. 1 Venting confi gurations
Installation guidelines:
Venting:
Must be 3" or 4" AL29-4C sealed stainless steel vent pipe.
Slope horizontal runs up to termination ¼" per foot. The horizon-
tal section between last elbow and termination must slope down
to the termination ¼" per foot.
Do not combination vent with any other appliance.
Always install an external condensate drain except when termi-
nating horizontally with less than 3 feet of pipe.
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 ¾".
Do not solder directly to the bottom of the unit.
Use unions to facilitate easy future maintenance.
Use full port ball valves for isolation valves.
Partially fi ll condensate drain tube loop with water prior to start
up.