48 Installing the Water Heater
Ref Description Canadian installations
1
US installations
2
D
Vertical clearance to ventilated
soffit located above the terminal
within a horizontal distance of
2 ft (61 cm) from the center line
of the terminal.
3 ft (91 cm)* 3 ft (91 cm)*
E
Clearance to unventilated soffit 3 ft (91 cm)* 3 ft (91 cm)*
F
Clearance to outside corner 2 ft (61 cm)* 2 ft (61 cm)*
G
Clearance to inside corner 12 in. (30 cm)* 12 in. (30 cm)*
H
Clearance to each side of center
line extended above meter/
regulator assembly
3 ft (91 cm) within a height of
15 ft (4.6 m)
3 ft (91 cm) within a height of
15 ft (4.6 m)*
I
Clearance to service regulator
vent outlet
3 ft (91 cm) 3 ft (91 cm)*
J
Clearance to nonmechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
36 in. (91 cm) for appliances
>100,000 Btuh (30 kW)
12 in. (30 cm) for appliances >
50,000 Btuh (15 kW)
K
Clearance to a mechanical air
supply inlet
6 ft (1.83 m)
3 ft (91 cm) above if within 10 ft
(3 m) horizontally
L
Clearance above paved sidewalk
or paved driveway located on
public property
7 ft (2.13 m)
†
7 ft (2.13 m) for mechanical draft
systems (Category I appliances).
Vents for Category II and IV
appliances cannot be located
above public walkways or other
areas where condensate or vapor
can cause a nuisance or hazard*
M
Clearance under veranda, porch
deck, or balcony
12 in. (30 cm)
‡
12 in. (30 cm) - open on 3 sides*
* Suggested clearances by the manufacturer. If the clearances required by local codes are different from those from the table above,
the greater clearance should apply.
1 The minimum distance from adjacent public walkways, adjacent buildings, openable windows, and building openings shall not be
less than those values specified in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane Installation
Code, CSA B149.1;
2 Information on preventing blockage by snow; and
3 Information on protecting building materials from degradation by flue gases.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and
serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
Note
●
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
●
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
●
If locally adopted installation codes specify clearances different than those illustrated, then the
most stringent clearance shall prevail.
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