In addition, the heater shall be installed such that the
gas ignition system components are protected from
water (dripping, spraying, rain, etc.) during appliance
operation or service (circulator replacement, control
replacement, etc.).
Clearances
Indoor Installations
Heater
Side
Minimum Clearance
from Combustible
Surfaces
Recommended
Service
Clearance
Floor* 0” 0”
Rear 1” 6”
Water Side 12” 24”
Other Side 1” 24”
Top 1” 6”
Front Open 24”
Vent 2” 2”
Table E: Clearances – Indoor Installations
Fig. 6: Minimum Clearances from Combustible
Surfaces – Indoor Installations
When installed according to the listed minimum clear-
ances from combustible construction, these heaters
can still be serviced without removing permanent
structural construction around the heater. Combustible
clearances can be reduced per the NFGC; see para-
graph 10.2.3. However, for ease of servicing, we
recommend a clearance of at least 24 in. in front, and
at least 12 in. on the water connection side. This will
allow the heater to be serviced in its installed location
without movement or removal of the heater.
Service clearances less than the minimums may
require removal of the heater to service either the heat
exchanger or the burner tray. In either case, the heater
must be installed in a manner that will enable the
heater to be serviced without removing any structure
around the heater.
Outdoor Installations
These heaters are design-certified for outdoor installa-
tion. Heaters must not be installed under an overhang
that is less than 3 ft from the top of the heater. Three
sides must be open in the area under the overhang.
Roof water drainage must be diverted away from
heaters installed under overhangs.
Heater
Side
Min. Clearance
from Combustible
Surfaces
Recommended
Service
Clearance
Front Open 24”
Rear 12” 6”
Water Side 36” 36”
Other Side 36” 36”
Top Unobstructed 36”
Vent N/A N/A
Table F: Clearances – Outdoor Installations
These clearances are required when the outdoor
vent cap is used. If installing the heater outdoors
with a vent stack, the indoor clearances may be
utilized.
The combustion air intake hood MUST be used for
outdoor installations. The hood is shipped loose and
installed on the side of the heater over the filter box at
the jobsite.
Top View
Front View
* DO NOT install on carpeting.
11
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