Applications manual | 9 |
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2.6 Bosch GWH 345 ESR
Features:
Specifically designed for recirculating applications Electronic ignition and built in power vent
GWH 345 ESR thermal efficiency of 82%
Vents vertically or horizontally with 3" stainless steel
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
GWH 345 ESR Technical Specifications
Gas input | GWH 345 ESR: 32,000 - 95,000 Btu/h |
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Maximum flow rates | GWH 345 ESR: 3.5gpm @ 45°F rise |
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Thermal Efficiency | 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 Specifications
Gas connection | ¾" Male NPT | ||||
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Water connections | ¾" Male NPT | ||||
NG gas pressure | Minimum: 5.5" W.C. | ||||
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| Maximum: 14" W.C. | |||
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LP gas pressure | Minimum: 11" W.C. | ||||
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| Maximum: 14" W.C. | |||
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Electrical supply | 120VAC - plugs in | ||||
Venting | 3" stainless steel | ||||
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| direct vent | |||
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GWH 450 ESR Installation Clearances |
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Top (A) | 12" |
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Front (B) | 1" |
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Back | 0" |
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Sides | 1" |
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Floor (C) | 12" |
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Fig. 1 Venting configurations
Installation guidelines:
Venting:
Must be 3" or 4"
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 fill condensate drain tube loop with water prior to start up.
Bosch Water Heating | Applications manual 11.2007 |