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WARNING
1. Flammable materials, gasoline, pressurized containers,
or any other items or articles that are potentially fire
hazards must never be placed on or adjacent to the
heater. The appliance area must be kept free of all
combustible materials, gasoline and other flammable
vapors and liquids.
2. Do not obstruct the flow of combustion and ventilation
air to the appliance.
CLEARANCES
This heather is designed certified for installation on a
combustible wall, in an alcove with minimum clearances to
combustible construction of 51mm (2 inches) from sides,
305mm (12 inches) from top and bottom. A minimum of
305mm (12 inches) shall be allowed for maintenance of
serviceable parts. Clearance from vent is dependent upon
the clearance rating of the venting material used; that is
type B-1 vent is approved for 1 inch clearance, B-2 vent for
2 inch, etc.
MOUNTING
The W125K…is designed certified for mounting to a wall.
The heather must not be installed directly on a carpeted
wall.
The heather must be mounted to the wall using appropriate
anchoring materials, through the four holes provided.
Expansion and contraction of piping due to changing water
temperature in pipes imparts movement to heater which, if
mounted directly to a brittle, board such as plasterboard
can cause failure of mounting.
Heater must be mounted level to assure proper operation.
VENTING
The BOSCH model W125K… instantaneous gas water
heater has a built-in a draft diverter is designed for indoor
installation only. The draft diverter outlet must be connected
to a clear, unobstructed vent of the same size or larger, refer
to:
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In Canada, CAN 1-B149 Installation Code for detailed
requirements
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In U.S., ANZI Z223.I/NFPA 54 National Fuel Gas Code
for detailed requirements
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The minimum length of a vertical vent up to the terminal
must be 2 ½ feet.
WATER CONNECTIONS
The W125K comes supplied with a ½’’ NPT cold water inlet
adapter and a flexible wire braid hot water outlet with a ½’’
NPT connection.
Figure 2
RELIEF VALVE
The listed pressure relief valve supplied must be installed
near the hot water outlet at time of installation of the
heater. No valve is to be placed between the relief valve
and the heater. A drain line must be connected to the
relief valve to direct discharge to a safe location. Do not
install reducing coupling or any other restriction in the
discharge line. The discharge line must be installed so
as to allow complete
drainage of both the valve and the line.
GAS CONNECTIONS
Before connecting the gas supply to the heater check
heater’s model/rating plate to make sure that gas on which
heater is to operate is the same as specified on the model/
rating plate.
The W125K…instantaneous gas water heater is supplied
with a gas pipe, a gas pressure regulator and a manual gas
cock that must be installed on the heater before attaching
the gas supply line, see figure 3. Failure to install gas pipe,
the main manual gas valve and the pressure regulator, or
the failure to install them in the sequence show in figure 3
will be in violation of the A.G.A. and C.G.A. certification of
the unit and can cause damage to heat changer.
BOSCH water heaters are shipped from the factory with
the gas pressure regulators preset for the gas shown on the
rating plate to the correct pressure.
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In Canada, for high altitude operation;
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In U.S., for standard altitude operation unless specially
marked as a high altitude unit.
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