Water Heater Installation Manual
18 Page
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 volume of the
Air Volume = Room Volume - Object Volume
NOTE:
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 or
If the air volume of the room is greater than the required air volume, it may be possible to install the water heat-
-
es, whole house fans, and clothes dryers draw air out of your home. If they draw air out faster than it can be
-
vent the water heater or install an adequate
Install with outside ventilation
Supplying outside air to the water heater typically requires two openings. One opening must be within 12 in (305 mm)
not preferred, you may use a single opening to outside air if the minimum free area is sized according to Table 1. Two
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