Rheem Direct Vent Gas Tankless Water Heater Use And Care Manual page 12

Installing the water heater:
Indoor Water Heater
Caulk
If soffit vent is too close,
block off and install new
vent at another location.
Inside
Caulk
Corner
6' (1.8 m)
Caulk Zone
4'
(1.2 m)
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
12
Rising moisture will
collect under eaves.
6'
(1.8 m)
6' (1.8 m)
Caulk
zone or to edge of window
etc.,starting within 6' (1.8 m).
Caulk
RTV silicone caulk
1 ft. sq. (30 x 30 cm) sheet metal plate on
brick or masonry surface, recommended.
Additional Considerations
Do NOT install vent terminal under any patio or deck.
To help prevent moisture from freezing on walls and under
eaves, do not locate vent terminal on the side of a building with
prevailing winter winds.
To help prevent water lines from freezing, do not locate vent
terminal on the side of a building with prevailing winter winds.
Do NOT locate vent terminal too close to shrubbery, as flue gases
may damage them.
Caulk all cracks, seams and joints within six (6) feet (1.8 m) of vent
terminal.
Caulk around thimble face plate for weather tight seal.
All painted surfaces should be primed to lessen the chance of
physical damage. Painted surfaces will require maintenance.
Do NOT extend exposed vent pipe of indoor water heaters outside
of building.
Guard vent against accidental contact with people and pets.