Tools required for installation
• Philips head screwdriver
• Flat head screwdriver
• Adjustable wrench
• Standard plumbing tools
Please follow these instructions. Failure to follow
instructions may result in:
B Damage or injury.
B Improper operation.
B Loss of warranty.
If you are unable to perform the tasks required to install
this heater properly, please contact a locally licensed
plumber or gas technician.
Proper location for installing your
Carefully select the location of the water heater. For
your safety and for proper heater operation, you must
provide combustion air to the heater and a proper
exhaust vent system.
Follow the guidelines below:
B 1. Locate the heater where venting, gas and
plumbing connections are feasible and convenient.
B 2. The hot water lines should be kept short and
insulated to save energy. Centrally locating the water
heater is recommended to keep hot water
distribution times even throughout the structure.
Warning: The water in this water
heater is cold and always remains cold
except for the times the burner is on. In
conjunction with freezing temperatures,
it is recommended that the heater be
See chapter 6.2, page 31 "Winterizing"
for draining instructions.
gasoline, pressurized containers, or any
other items or articles that are potential
fire hazards must NOT be placed on or
adjacent to the heater. The appliance
combustible materials, gasoline and
other flammable vapors and liquids.
Heater placement and clearances
The GWH C 800 ES design is approved for
installation on a combustible wall (see chapter 3.5
covering below the heater is noncombustible.
For installations in an alcove or closet, maintain the
combustible materials listed below. See also Fig. 7,
A. Top 12 inches (306 mm)
B. Front 1 inches (25 mm)
C. Back 0 inches
D. Sides 1 inches (25 mm)
E. Bottom 12 inches (306 mm)
Warning: before starting installa-
B Check that there are no loose parts
inside the appliance
B Confirm that the gas type of the
heater matches the gas supply you
will be connecting the heater, See
Fig. 2, page 5.
B Ensure that gas pipe, gas valve,
mixer, fans and burner have no
damage and are properly fitted.
Front cover should be removed (see
instructions on page 6) in order to inspect
Warning: Do not install this appliance
on a carpeted wall. The heater must be
mounted on a wall using appropriate
If wall is sheathed with plaster or drywall, it is
recommended that two support boards, either 1"x4" or
1/2" (minimum) plywood first be attached across a pair
of studs, see Fig. 8, page 9.
B Secure the wall mounting bracket provided with the
heater to a wall surface. The heater must be kept
level on the wall surface, see Fig. 9, page 9.
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