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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, as
flue gasses may damage them. A minimum distance of 4
ft. (1.22 m) is recommended.
–
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 installations, a minimum distance
between vent terminations must be maintained to prevent
recirculation of vent gases. Maintain a center-to-center
distance between each pair of vent terminations as listed
below:
24 in. (61 cm) for a two-unit installation;
24 in. (61 cm) and 36 in. (91.4 cm) for a three-unit
installation;
24 in. (61 cm), 36 in. (91.4 cm), and 24 in. (61 cm) for a
four-unit installation.
If so t vent is too close,
block o and install new
vent at another location.
Inside
Corner
Caulk
28
Rising moisture will collect under eaves.
Caulk
6' (1.8 m) Caulk zone or
to edge of window etc.,
starting within 6' (1.8 m)
Caulk
Caulk
5.5"to 24 "
(14 cm to 61cm)
4'
(1.2 m)
–
DO NOT terminate vent directly on brick or masonry
surfaces. Use rust-resistant, sheet-metal backing plate
behind the vent.
–
The vent for this appliance shall not terminate
•
Over public walkways; or
•
Near soffit vents or crawl space vents or other area
where condensate or vapor could create a nuisance
or hazard or cause property damage; or
•
Where condensate or vapor could cause damage or
could be detrimental to the operation of regulators,
relief valves, or other equipment.
–
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.
–
Observe minimum clearances. Vent terminals must be
a minimum of 5.5 inches (14 cm) and a maximum of 24
inches (61 cm) apart horizontally.
–
Install indoor and outdoor water heaters such that air
inlet and flue outlet are above anticipated snow level.
Rising moisture will collect under eaves.
Caulk
If soffit vent is too close,
block off and install new
vent at another location.
Inside
Corner
6' (1.8 m) Caulk zone
or to edge of window
Caulk
etc., starting within
6' (1.8 m)
4'
(1.2 m)
Caulk
12"
(300 mm)
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