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Old 09-27-2008, 08:04 AM   #1
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how to relocate existing vent for gas hot water tank


THIS IS MY FIRST TIME POSTING ... last year my husband installed a new/taller gas hot water tank and used the existing vent pipe from the old/shorter hot water tank. we were informed that now the vent pipe does not have enough of an upward slope and we should fix it soon, it's not exactly horizontal, but the slope is not what is recommended. as the hot water vent is shared w/ the furnace vent and go right into the chimney, it was suggested to create another hole in the chimney and redirect the hot water vent above. Is there an easier fix to this. If not, should the repair be done by a professional or can we do this and how. I'm a little concerned about cutting a hole into the cement wall for the chimney. thanks

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Old 09-27-2008, 08:44 AM   #2
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how to relocate existing vent for gas hot water tank


National Fuel Gas Code is 1/4" per foot. So if the gas-fired appliances is 4 foot away from the horizontal termination it would need to be one inch higher. If it is father you must maintain 1/4 inch per foot through out.

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Old 09-30-2008, 12:10 PM   #3
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how to relocate existing vent for gas hot water tank


Cutting a hole in the chimney is not a problem. Just get a masonary chisel and hammer away. If there are bricks then you can take out the grout and pull out the bricks one at a time. Once the whole is big enough then put in the exhaust pipe and caulk the areas around the pipe.

If the area is too big to caulk then make a cover out of sheet metal and cut the exhaust hole in there and mount the cover on the chimney with concrete screws or even silicone will do.

Make sure you cover the previous hole.

As a retired Paramedic make sure you have a carbon monoxide detector in the house. I have seen too many people who didn't have one and when a Paramedic is called in those situations it is never good.
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Old 09-30-2008, 06:23 PM   #4
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how to relocate existing vent for gas hot water tank


thanks for the reply. carbon monoxide is my main concern for getting this project done. instead of closing up the second hole, could we just keep the furnace in one hole and make another hole just for the hot water tank vent ??
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Old 09-30-2008, 06:38 PM   #5
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how to relocate existing vent for gas hot water tank


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Originally Posted by rdf2026 View Post
thanks for the reply. carbon monoxide is my main concern for getting this project done. instead of closing up the second hole, could we just keep the furnace in one hole and make another hole just for the hot water tank vent ??
If the existing vent it there then I suppose that works. I can't see it and have to assume it is fine where it is.

Just make sure that the hole that is left from the hot water tank is plugged.

You should still get a CO detector. I recommend one for all homes. They are cheap enough and do save lives.
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