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
TOP VIEW
FRONT VIEW
Venting not shown for clarity. Heater must be vented
per instructions in this manual
Fig. 7: 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 per-
manent structural construction around the heater.
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 heat-
er 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 instal-
la-tion. Heaters must not be installed under an
overhang that is less than 3 ft from the top of the heat-
er. 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.
* DO NOT install on carpeting.
11
APPROVED
UNCONTROLLED DOCUMENT IF PRINTED
