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PLEASE NOTE: SH22 IS FOR OUTDOOR PERMANENT INSTALLATIONS ONLY AND SH22I IS FOR INDOOR PERMANENT INSTALLATIONS ONLY. THIS MANUAL
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Installing the SH22i Water Heater, Continued...
Venting Lengths
MAXIMUM VENT LENGTH
Owner must refer to vent manufacturer’s instructions and specifications. Z-Flex information can be
found at www.novaflex.com.
The system will not operate if there is excessive restriction
(pressure drop) in the venting system. A maximum of 32 feet of
vent pipe may be used provided there is only one 90° elbow in
the system. If additional elbows are required: two elbows can be
used with 27 feet, and three elbows can be used with 22 feet of
vent pipe.
A 90° elbow is equivalent to 5 feet of straight pipe. A 45° elbow
is equivalent to 2 feet 6 inches of straight pipe .
The termination elbow does not count as an elbow when
determining total vent lengths.
The vent must be installed with a slight downward slope of 1/ 4”
per foot of horizontal run toward the vent terminal (see diagram
below). This ensures that any condensate formed during
operation of the unit is evacuated from the water heater.
A 1/4” per foot upward slope is acceptable when it is not
possible to vent with a downward slope, however, a UL approved
Category III Stainless Steel condensate trap MUST be installed
at the beginning of the horizontal run (See page 22 “Typical
Horizontal Termination w/ 1/4” per foot UPWARD Slope” or
page 16, “Standard Vertical Vent Termination” for examples).
Number of
90° elbows
(bends)
Maximum
Length of
Straight Pipe
1
2
3
32’
27’
22’
One (1) 90° Elbow is
Equivalent to 5 Feet of
Straight Pipe
MINIMUM VENT LENGTH
The venting may be as short as 12”,
provided one vent termination is
installed to the outdoors through a
sidewall, one 90°elbow is included
in the installation, and the wall
thimble is installed.
NOTICE:
Make sure that the seam
of the vent pipe in horizontal runs is
toward the top of the installation (see
illustration to the left).
12 in.
Minimum
More than 6”
1/4” per foot
downward slope.
Vent Seam
Number of
90° elbows
(bends)
32’
27’
22’
The system will not operate if there is excessive restriction
(pressure drop) in the venting system. A maximum of 32 feet of
vent pipe may be used provided there is only one 90° elbow in
the system. If additional elbows are required: two elbows can be
used with 27 feet, and three elbows can be used with 22 feet of
vent pipe.
A 90° elbow is equivalent to 5 feet of straight pipe. A 45° elbow
is equivalent to 2 feet 6 inches of straight pipe .
The termination elbow does not count as an elbow when
determining total vent lengths.
The vent must be installed with a slight downward slope of 1/ 4”
per foot of horizontal run toward the vent terminal (see diagram
below). This ensures that any condensate formed during
operation of the unit is evacuated from the water heater.
A 1/4” per foot upward slope is acceptable when it is not
possible to vent with a downward slope, however, a UL approved
Category III Stainless Steel condensate trap MUST be installed
at the beginning of the horizontal run (See page 22 “Typical
Horizontal Termination w/ 1/4” per foot UPWARD Slope” or
page 16, “Standard Vertical Vent Termination” for examples).
32’
27’
22’
One (1) 90° Elbow is
Equivalent to 5 Feet of
Straight Pipe
