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Your water heater’s BTU/h rating is on the rating plate. The BTU/h ratings should be on the other
appliances’ rating plates. If you have trouble determining the BTU/h ratings, contact the manufacturer
or have a qualified person determine the ventilation requirements.
NOTICE:
Gas Burning Appliance
Gas Water Heater 199,000
Furnace 75,000
Dryer 20,000
Total 294,000
Example:
Gas Burning Appliance
Gas Water Heater
Total
Your
appliances:
Calculate the air volume of the room
Air requirements depend on the size of the room.
3
2
If there are large objects in the room (e.g., refrigerator, furnace, car), subtract their volume from the vol-
Air Volume = Room Volume - Object Volume
Calculate required air volume
3
(1.42 m
3
) per 1,000 BTU/h of the total input for all gas burning appliances in the same area.
3
3
/ 1000 (btu/h)
Example:
3
If the air volume of the room is less than the required air volume, you must direct vent the water heater
-
If the air volume of the room is greater than the required air volume, it may be possible to install the
as furnaces, whole house fans, and clothes dryers draw air out of your home. If they draw air out faster
-
”
Install with outside ventilation
Supplying outside air to the water heater typically requires two openings. One opening must be within 12 in
single opening is not preferred, you may use a single opening to outside air if the minimum free area is sized
according to Table 1
Installaon
Installaon Manual
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