Rheem GHE 125-500A, Use & Care Manual, Page: 14 / 40

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HORIZONTAL VENT INSTALLATION – Once the vent
terminal location has been determined, make a hole
through the exterior wall to accommodate the vent
pipe. Vent pipe must exit exterior wall horizontally only
(See Figure 12).
Insert a small length of vent pipe through the wall and
connect the coupling as shown in Figure 10. Connect
terminal as shown to the vent pipe on the exterior of
the building. Seal any opening around the vent pipe or
fittings with mortar or silicone caulk as shown in Fig-
ure 10.
Complete the rest of the vent pipe installation to the
water heater’s vent connector fitting on the blower
outlet. If necessary support horizontal run as previ-
ously mentioned.
Figure 11 – Vertical Vent Terminal Location
Figure 9
Min. 24"
Max. 36"
Inlet
Outlet
Additional Considerations (See Figure 15 & 16)
1.
DO NOT
install vent terminals under any patio or
deck.
2. To help prevent moisture from freezing on walls and
under eaves,
DO NOT
locate outlet vent terminal on
the side of a build ing with prevailing winter winds.
3.
DO NOT
terminate vent pipe directly on brick or
masonry surfaces. Use a rust-resistant sheet metal
backing plate behind vent. (See Figure 10.)
4.
DO NOT
locate vent terminal too close to shrubbery,
since flue gases may damage them.
5. Caulk all cracks, seams and joints within six (6)
(1.83 m) feet of vent terminal.
6. All painted surfaces should be primed to lessen the
chance of physical damage. Painted surfaces will re-
quire maintenance.
7. Insulate vent pipe exposed to cold conditions (attics,
crawl spaces, etc.) to help prevent moisture from ac-
cumulating in vent pipe.
8. This water heater requires its own separate venting
system.
DO NOT
connect the exhaust vent to an ex-
isting vent pipe or chimney.
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 sur-
rounding 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.
VERTICAL VENT INSTALLATION – Once the vent
terminal location has been determined, make a hole
through the roof and interior ceiling to accommodate
the vent pipe. Complete the vent pipe installation to
the water heater’s vent connector fitting on the blower
outlet. Support vertical or horizontal runs as previously
mentioned (See Figure 12).
Install adequate flashing where the vent pipe passes
through the roof. Determine the vent terminal height
and cut vent pipe accordingly. Refer to Figure 11 for
proper vent terminal height. Connect vent elbow onto
vertical pipe through roof. Connect short piece of vent
pipe (approximately 3" (7.6 cm) long) to elbow, then
join terminal to the short piece of vent pipe.
VERTICAL VENT TERMINAL LOCATION
– The location
of vertical vent terminal depends on the following con-
siderations (see Figure 11):
1. Minimum twelve (12 inches) (30.5 cm) above roof
18" inches (46 cm) for Canada.
2. Minimum twelve (12 inches) (30.5 cm) inches above
anticipated snow level.
3. Maximum twenty-four (24 inches) (61 cm) inches
above roof level without additional support for vent
pipe.
4. Four (4) feet (1.22 m) from any gable, dormer or
other roof structure with building interior access
(i.e., vent, window, etc.).
5. Ten (10) feet (3.05 m) from any forced air inlet to the
building. Any fresh or make-up air inlet such as a
dryer or furnace area is considered to be a forced
air inlet.
6. Vent Terminals are a minimum of twenty-four (24)
inches (61 cm) and a max of 36" horizontally apart.
VENT INSTALLATION
– Before proceeding, make cer-
tain you understand the procedure and cautions cov-
ered in the section “Joining Pipes and Fittings.”
Installation
Figure 10 – Typical Horizontal Vent Installation
Pipe &
Coupling
Sheet Metal Shield on
Brick or Masonry Walls
Outside of
Building Wall
From Water
Heater
Vent Pipe
Vent Terminal with
1
/
2
" Mesh Protec-
tive
Screen Inside
Vent
Pipe
Short Piece of Vent
Pipe
*Min. 12" Above Roof or
Min. 12" Above Anticipated
Snow Level.
Max. 24" Above Roof
(Without Additional Sup-
port)
Vent Pipe
Through Roof
Elbows
* Min of 18" for Canada
WARNING
!