T-H3 Installation Manual

15 Page
Your water heaters 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


Installaon
Installaon Manual