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Installation Instructions - Bosch Pro Tankless GWH-450-ES Series Manual

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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Installation instructions

Please follow these instructions. Failure to follow
instructions may result in:
• Damage or injury
• Improper operation
• Loss of warranty.
Please contact BBT North America with any questions.
Proper location for installing your
water heater
Carefully select the location of the water heater. For
your safety and for proper operation, you must provide
combustion air to the water heater and a proper exhaust
vent system.
Follow the guidelines below:
B 1. Locate the water heater where venting, gas and
plumbing connections are feasible and convenient.
B 2. The hot water lines should be kept short to save
energy. Centrally locating the water heater is best. It
is always best to have hot water lines insulated.
Warning: The water in this water
heater is cold and always remains cold
except for the times the burners are on.
In the event of power outage in
conjunction with freezing temperatures,
it is recommended that the heater be
drained. See chapter 5 for draining
gasoline, pressurized containers, or any
other items or articles that are potential
fire hazards must NOT be placed on or
adjacent to the water heater. The
appliance area must be kept free of all
combustible materials, gasoline and
other flammable vapors and liquids.
6 720 607 915
The GWH-450-ES is design certified for installation on
a combustible wall (see 3.4 Mounting installation)
provided the floor covering below the water heater is
noncombustible. For installations in an alcove or closet,
maintain the minimum clearances to combustible and
non-combustible materials listed below. See also fig. 5.
A. Top 12 inches (305 mm)
B. Front 4 inches (100 mm)
C. Back 0 inches
D. Sides ½ inches (12 mm)
E. Bottom 12 inches (305 mm)
Clearances from any exhaust vent pipe are dependent
upon the clearance requirements of the stainless steel
vent pipe manufacturer. Single wall stainless steel
(AL29-4C) vent pipe (vent type rated for Category III
appliances) must be used when exhaust venting this
appliance. See 3.6 Venting.
B Secure the wall mounting bracket provided with the
water heater to a wall surface.
If wall is a stud wall sheathed with plasterboard, it is
recommended that support board(s), either 1x4.s or 1/
2" (minimum) plywood first be attached across a pair of
studs. Then attach the heater's bracket to the upper
support board. The water heater should be kept level on
the wall surface. See Fig. 7.
Installation instructions
Water heater placement and
Mounting installation
Warning: before starting installation:
B check that there are no loose parts
inside the appliance
B check the gas type of the water heater
matches the gas supply you will be
connecting to the heater.
B ensure that gas pipe, gas valve, fan and
burner have no damage and are proper-
ly fitted.
Front cover should be removed (see
instructions on page 5) in order to inspect
components visually.
Warning: Do not install this appliance
on a carpeted wall. The water heater
must be mounted on a wall using
appropriate anchoring materials.



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