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Old 12-09-2008, 03:52 PM   #1
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water heater venting

can all gas water heaters be vented out a wall? or does it have to been a special heater. direct vent heater?


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Old 12-09-2008, 08:00 PM   #2
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You need to check with the manufactures install and local codes for direct vent


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Old 12-09-2008, 09:25 PM   #3
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Different heaters require different venting. It is based on model and local codes.
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Old 12-10-2008, 09:12 AM   #4
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I agree with checking local Codes. The States I have worked in required the flue on gas heaters to "continually go upwards" until exiting the home. This meant that no horizontal runs of pipe could be used, only 45 degree turns. This applied to standard gas water heater flues.
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Old 12-10-2008, 11:33 AM   #5
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Upward flow is of course necessary. The vent is sized based on the appliance, the vent length, elbows, and other factors.

Local codes will dictate, and the manufacturer's installation instructions is more than likely what you'll be required to adhere to. I will tell you that it is rarely as simple as venting through a wall with a gas water heater. Most will require a roof vent termination in order to get airflow around the vent. Proximity to vertical surfaces is strictly limited by code, even on roof terminations. Proximity to doors, operable windows, inside corners, and grade can be a big issue.
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