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Old 10-28-2010, 05:42 AM   #16
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Move Gas Water Heater to Garage


Quote:
Originally Posted by beenthere View Post
30X25X8=6000
6000/50=120

So your garage is ok for a total of 120,000 BTUs of input.

You can only use a B vent tee. To Tee into a B vent system. Means you can't use a single wall tee.

Don't have my book close to me. Not sure 4" B vent can handle 115,000 BTUs with your current vent run. I can look it up tonight though..

THANK YOU

I REALLY appreciate you taking the time to help me. I do have a couple of questions...

1- The furnace vent system inside the garage is single wall. So do you recommend I change it all to B-vent?

2- My house is 5-years old and the builder installed the water heater in a closet, 6x6x8
What is your opinion about that in regard to enough BTU's for combustion?

Also, how would YOU go about this kind of installation? Water heater and furnace in a garage.

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Old 10-28-2010, 02:41 PM   #17
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Move Gas Water Heater to Garage


At 26 foot of height. It can handle 118,000 plus BTUs.

How ever. The pipe from both the furnace and water heater should be B vent also.

If you use single wall to get tot he furnace single wall flue. It better have a very steep rise. Or it will condensate in the single wall.
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Old 10-28-2010, 03:01 PM   #18
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Move Gas Water Heater to Garage


Quote:
Originally Posted by beenthere View Post
At 26 foot of height. It can handle 118,000 plus BTUs.

How ever. The pipe from both the furnace and water heater should be B vent also.

If you use single wall to get tot he furnace single wall flue. It better have a very steep rise. Or it will condensate in the single wall.

OK, I think I got it now. They used B-vent in the attic because the attic gets very cold but the garage is partially heated. It gets cold when you raise the door but warms up quickly once the door is closed. That may be why they used single wall inside the garage but I will use B-vent on the entire run.

So my last question is can I use a Tee in the attic or must I use the Tee inside the garage.

Thanks
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Old 10-28-2010, 06:49 PM   #19
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Move Gas Water Heater to Garage


You can do it either way.

However. If you make another hole in your garage ceiling. The garage will become colder.

The garage warms up because the furnace and its single wall pipe lose heat to it.

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