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Recess Box Location
guidelines below or in the Use and Care Manual provided with the water heater for choosing a suitable location.
X AIR SUPPLY INLET
V VENT TERMINAL
Water Heater Exhaust Terminal Location
The following information should be used for determining the proper
location of the vent terminal for outdoor tankless water heaters.
A= Clearance above grade, veranda,
porch, deck or balcony.
B= Clearance to window or door that
may be opened.
C= Clearance to permanently closed
window.
D= Vertical Clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61 cm)
from the center line of the terminal.
E= Clearance to unventilated soffit.
F= Clearance to outside corner.
G= Clearance to inside corner.
H = Clearance to each side of center line
extended meter/regulator assembly.
above
I = Clearance to service regulator vent
outlet.
J = Clearance to nonmechanical air
supply inlet to the combustion air
inlet to any building or other
appliance.
K = Clearance to mechanical air supply
inlet.
L = Clearance above paved side walk or
paved driveway located on public
property.
M = Clearance under veranda, porch,
deck or balcony.
1 In accordance with current CAN/CGA-B149 Installation Codes.
2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
+ A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and
serves both dwellings.
* If clearances are not specified then follow local installation codes and the requirement of the gas supplier.
** For condensing appliances: The vent for this appliance shall not terminate over public walkways, near soffit vents, crawl space
vents, of other areas where condensate or vapor could create a nuisance, hazard, or cause property damage. Where
condensate or vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other
equipment.
- This water heater recess box is intended for an outdoor location only. Follow the
AREA WHERE TERMINAL IS NOT PERMITTED
Canadian Installations
1
12 inches (30 cm) above anticipated
snow level.
6 inches (15 cm) for appliances < 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and <
100,000 Btuh (30kW), 36 inches (91 cm)
for appliances > 100,000 Btuh (30kW).
*
*
*
*
*
3 feet (91 cm) within a height 15 feet
(4.57 m) above the meter/regulator
assembly.
3 feet (91 cm)
6 inches (15 cm) for appliances < 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91
cm) for appliances > 100,000 Btuh
(30kW).
6 feet (1.83 m)
Not allowed
Not allowed
Figure 1
US Installations
2
12 inches (30 cm) above anticipated
snow level.
6 inches (15 cm) for appliances < 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and
< 50,000 Btuh (15 kW), 12 inches
(30 cm) for appliances > 50,000 Btuh
(15 kW).
*
*
*
*
*
*
*
6 inches (15 cm) for appliances < 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and
< 50,000 Btuh (15 kW), 12 inches
(30 cm) for appliances > 50,000 Btuh
(15 kW).
3 feet (91 cm) above if within 10 feet
(3 m) horizontally.
Not allowed
Not allowed
2
Caulk
Rising moisture will collect under eaves
If soffit vent is too close,
block off and install new
vent at another location
Inside
corner
6' (1.8 m) caulk
zone
Caulk
4'
(1.2 m)
WARNING
Moisture in the flue gas will condense as it
:
leaves the vent terminal. In cold weather this condensate can
freeze on the exterior wall, under the eaves and on
surrounding objects. Some discoloration to the exterior of
the building is to be expected. However, improper location
or installation can result in severe damage to the structure
or exterior finish of the building
Additional Considerations
1.
Do not install water heater under
any patio or deck.
2.
To help prevent moisture from
freezing on walls and under eaves,
do not locate the water heater on the
side of a building with prevailing
winter winds.
3.
To help prevent water lines from
freezing do not locate water heater
on the side of a building with pre-
vailing winter winds.
4.
Do not locate water heater too close
to shrubbery, as flue gasses may
damage them.
5.
Caulk all cracks, seams and joints
within six (6) feet (1.8 m) of exhaust
vent.
6.
Guard exhaust vent against acciden-
tal contact with people and pets.
7.
Install the water heater such that the
air inlet and exhaust vent are above
anticipated snow levels
6'
(1.8 m)
6' (1.8 m)
caulk zone or to edge of
window etc., starting
within 6' (1.8 m)
Caulk
Figure 2
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