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Old 11-24-2009, 05:01 PM   #1
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venting furnace & water heater


Can I run my gas water heater and my gas high efficiency heater through the same vent?

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Old 11-24-2009, 05:13 PM   #2
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venting furnace & water heater


These devices come with instructions. What do they say?
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Old 11-24-2009, 05:36 PM   #3
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venting furnace & water heater


They were installed by the previous owner.
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Old 11-24-2009, 07:21 PM   #4
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venting furnace & water heater


Quote:
Originally Posted by tcoly View Post
They were installed by the previous owner.
The units have instruction, no matter who installed them. If the manuals are not in the house, the manuals are usually available from the manufacturer. These can usually be accessed and downloaded from the internet.
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Old 12-15-2009, 05:08 PM   #5
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venting furnace & water heater


You probably do not have a high efficiency furnace if it is vented to the roof along with your water heater. True high efficiency furnaces produce condensate which must be vented out through a wall using ABS or PVC pipe. With such condensing furnaces the intake and outflow lines need to be done properly to keep flue gases from being drawn into the house.

Your furnace may be an 80% unit with a variable speed motor to make it more efficient but it is still a 80% furnace and not one of the new 90-95% efficient designs (which can cost twice as much to buy and install).
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Old 12-15-2009, 05:41 PM   #6
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venting furnace & water heater


If an appliance is venting through a PVC (plastic) pipe, it usually requires a individual dedicated exhaust vent - common or breach venting will be prohibited in the manufacturer's installation instructions. (Many such appliances can vent through either a roof or wall, BTW).

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