12
Table 2
Outdoor Installation Clearances
Heater Panel
Required Clearance
Top
Unobstructed
Front
24 inches
Back
6 inches
Water Connection Side
12 inches
Side Opposite Water
Connection
6 inches
5.
Do not install under a deck.
6.
Do not install within 24” of any outdoor
HVAC equipment.
7.
Do not install where water may run-off a
roof into the heater. A gutter may be need-
ed to protect the heater.
8.
Any enclosure around the heater must
provide a combustion air vent commenc-
ing within 12 inches of the bottom of the
enclosure. The vent opening shall have
a minimum free area of 1 square inch per
4,000 btu/hr input rating of all gas appliances in the enclosure. See Table 5.
9. If the heater is to be installed in front of an exterior wall with with vinyl siding, increase the clearance
from the back of the unit shown in Table 2 to 12 inches.
10. For minimum exhaust vent clearances for all building openings, including but not limited to vented
eaves, doors, windows, or gravity inlets, see Figure 3. In Canada, the heater must be installed with
the top of the vent at least 10 feet (3m) below, or to either side of, any opening into a building.
4
ft
Minimum
4
ft
Minimum
3
ft
Minimum
10
ft
Minimum
4
ft
Minimum
Figure 3: Minimum Clearances
Forced Air Inlet
