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18
VENTING LENGTHS
Maximum Vent Length
Owner must refer to vent manufacturer’s instructions and specifications.
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 ” 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 feet 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 feet 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 20 “Typical Horizontal Termination w/ 1/4” per foot UPWARD Slope” or page 18, “Standard
Vertical Vent Termination” for examples).
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)
Draining the Condensate
In certain conditions, installations in unconditioned space or having long horizontal or vertical runs may
accumulate condensate.
Condensate is known to be acidic; refer to local, state (provincial) or federal codes for proper handling
methods.
In order to prevent condensate from draining back into the water heater, we recommend a condensate trap
and drain to be installed in a horizontal vent section as close as practical to the water heater vent connection.
Not following proper condensate procedures will void warranty.
Vent Seam
More Than 6”
Number of 90°
elbows(Bends)
One(1)90° elbow is equivalent to 5
feet of straight pipe
Maximum length
of straight pipe
1
32”
27“
22”
2
2
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3330-A Marathon Ct Charleston, SC 29418
(844) 538-7475
