51Installing the Water Heater
Ref Description Canadian installations
1
US installations
2
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 minimum clearances by the manufacturer. If the clearances required by the local authority or gas supplier 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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