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40
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater (cont.)
Horizontal Vent Considerations
!
WARNING:
Moisture in the flue gas will condense as it leaves
the vent terminal. In cold weather this condensate
can freeze on the exterior wall, under the eaves,
and on surrounding objects. Some discoloration
to the exterior of the building is to be expected.
However, improper location or installation can
result in severe damage to the structure or exterior
finish of the building.
– DO NOT locate vent terminal on the side of
a building with prevailing winter winds. This
will help prevent water lines from freezing and
moisture from freezing on walls and under
eaves.
– DO NOT locate vent terminal too close to
shrubbery, since flue gases may damage
them.
– All painted surfaces should be primed to
lessen the chance of physical damage.
Painted surfaces will require maintenance.
– Guard against accidental contact with people
and pets.
Indoor Tankless Water Heaters
!
WARNING:
For multiple-unit installation, a minimum distance
between vent terminations must be maintained
to prevent recirculation of vent gases. Maintain
a horizontal center-to-center distance between
vent terminations of 19 in. (48 cm) for two-unit
installation, or 21 in. (53 cm) for installation of three
or more units*.
*Vents cannot be stacked vertically.
– DO NOT terminate vent directly on brick or
masonry surfaces. A rust-resistant, sheet-
metal backing plate is recommended behind
the vent.
– Caulk all cracks, seams, and joints within
6 ft. (1.8 m) of the vent terminal.
– Caulk around wall faceplate for weather-tight
seal.
– DO NOT extend exposed vent pipe of indoor
water heaters outside of the building.
– This water heater requires its own separate
venting system. DO NOT connect the exhaust
vent to an existing vent pipe or chimney.
Outdoor Tankless Water Heaters
– Install outdoor water heater such that air inlet and flue
outlet are above anticipated snow level�
Rising moisture will collect under eaves.
Inside
Corner
Caulk
Caulk
Caulk
Caulk
If soffit vent is too close,
block off and install new
vent at another location.
Sheet metal plate on brick or
masonry surface recommended.
6' (1.8 m) Caulk zone or
to edge of window etc.,
starting within 6' (1.8 m)
4'
(1.2 m)
Rising moisture will collect under eaves.
Inside
Corner
Caulk
Caulk
Caulk
If soffit vent is too close,
block off and install new
vent at another location.
6' (1.8 m) Caulk zone
or to edge of window
etc., starting within
6' (1.8 m)
4'
(1.2 m)
12"
(300 mm)
Venting
minimum 19 in� (48cm)
minimum 21 in� (53cm)
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