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Applications manual
Application manual | 11.2007
Bosch Water Heating
2.10 Bosch GWH 260 PN
Features:
Standing pilot ignition
78% thermal effi ciency
Mounts on wall for easy installation
Venting: 4" double wall B-vent — natural draft
Modulating gas valve — constant temperature at varying flow rates
Model GWH 260 PN N for natural gas (NG) supply
Model GWH 260 PN L for liquid propane (LP) supply
15-year warranty
GWH 260 PN Technical Specifi cations
Gas input Natural Gas: 30,735 - 74,900 BTU
LP Gas: 30,735 - 74,900 BTU
Minimum fl ow to activate 0.6 gallons per minute (gpm)
Flow rates 45˚F rise @ 2.6 gpm
55˚F rise @ 2.1 gpm
65˚F rise @ 1.7 gpm
77˚F rise @ 1.5 gpm
90˚F rise @ 1.3 gpm
Thermal Effi ciency NG: 78% LP: 78%
Dimensions 28.8" h x 12.2" w x 8.5" d
Weight 25 lbs.
Modulating gas valve yes
Ignition Standing pilot
GWH 260 PN Installation Specifi cations
Gas connection ¾" Male NPT
Water connections ¾" Male NPT
NG gas pressure Minimum: 7" W.C.
Maximum: 14" W.C.
LP gas pressure Minimum: 11" W.C.
Maximum: 14" W.C.
Water pressure
(Static)
Minimum: 30 PSI
Minimum well pressure: 40PSI
Maximum: 150 PSI
Electrical supply 120VAC - plugs in
Venting 4" double wall B-vent - natural
draft
GWH 260 PN Installation Clearances
Top (A) 12"
Front (B) 4"
Back 0"
Sides 4"
Floor (C) 12"
LIS TED VENT C AP
MINIMUM 6
FEET (1.8M)
LISTED GAS VENT
ESTABLISH A ONE
FOOT RISE BEFORE
ANY ELBOWS
Fig. 4 Venting confi guration
Installation guidelines:
Venting:
4" minimum diameter — do not reduce vent size.
Refer to installation manual for vent material options
Do not combination vent with any power vented appliances.
Establish a one-foot rise before any elbows
Minimum vent height - 6 feet.
Horizontal sections must slope upwards at least ¼" for every foot
of the horizontal length and be properly supported.
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 full port ball valves for isolation valves.
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