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Old 10-21-2010, 07:28 AM   #1
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Move Gas Water Heater to Garage


I want to move my gas water heater to the garage next to the furnace. I can go up to the attic using a B-Vent and would like to know if I can "WYE" tee into the furnace vent that is already in the attic? This way I do not have to cut another hole in my roof. Both are natural draft systems.

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Old 10-21-2010, 07:43 AM   #2
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Not unless it is big enough to handle the additional fumes/load. Need to combine the BTUs of both and length of chimney and diameter and check local gas code book. Code may require the tee to not be in the attic. There are specific ways that the tee has to be installed according to codes. Post some pics of it and we may be able to help. Where do you live?

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Last edited by yuri; 10-21-2010 at 07:46 AM.
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Old 10-21-2010, 08:44 PM   #3
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Also. if you move it tot eh garage. Code will require it to be raised 18" off the floor.
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Old 10-21-2010, 09:44 PM   #4
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Move Gas Water Heater to Garage


Garage will also need 50 cubic feet of free air space for each 1000 BTU, furnace and water heater combined, or it will need to bring in outside air if the area isn't big enough. Could get mighty cold out there with all that outside air coming in.
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Old 10-21-2010, 11:19 PM   #5
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Also. if you move it tot eh garage. Code will require it to be raised 18" off the floor.

Good point

If it's 1 of the newer type water heaters ( flame guard type). by code (IFGC) we don't have to put them 18'' off the garage floor. But, some cities in my area still want them 18''. You should work in my area. Every city I work in has their own set of rules
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Old 10-22-2010, 05:11 AM   #6
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Move Gas Water Heater to Garage


Same here. And in some areas, the townships have jurisdiction, and the split is which side of the street your on.
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Old 10-22-2010, 07:49 AM   #7
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and the split is which side of the street your on.



Funny you should say that., Because here, That statement is literally ture, 1 home can be in 1 city (we don't have townships) & the home across the street or even next door is in another. We have some areas where the home is split . Meaning that the front of the home is in 1 county the rear of the home is in another
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Old 10-22-2010, 09:26 AM   #8
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Move Gas Water Heater to Garage


This thread is just great for me. I got a lot of ideas for my appliance problem.
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Old 10-27-2010, 09:26 AM   #9
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Move Gas Water Heater to Garage


OK, here are some shots... I will mount it 18" above grade and there is enough air for proper combustion as it is in a 2-car garage.

I need ideas on how to tee it into the furnace vent.
The gas line hook up is pretty straight forward.
The water line hook up is also pretty simple.
Itís just the tee connection that has me stumped.

If all else fails I can always install an electric water heater.


This is the furnace vent in attic



Also the furnace vent in attic


Water heater location now...



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Old 10-27-2010, 09:43 AM   #10
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Move Gas Water Heater to Garage


You need to addup the BTU input of the water heater and furnace from their labels and check a gas code book. Chimney is sized for XXX Btus and adding more may overload it. Post them here and one of our techs may be nice enough to check his code book for you. How many vertical feet of pipe rises from the garage ceiling to the top of where it exits garage roof do you have. That affects the sizing too. Measure EXACTLY the outside diameter of the chimney pipe in the attic or see if it has a size stamped on it, looks like B vent.
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Last edited by yuri; 10-27-2010 at 09:47 AM.
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Old 10-27-2010, 06:39 PM   #11
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Your only allowed to Tee into B vent, with a B vent Tee.

How big is your garage? Takes a lot of air to run both a furnace and water heater at the same time.
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Old 10-27-2010, 09:56 PM   #12
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Beenthere: It's a 2-car garage, 30 x 25 x 8, not sure what you mean by "Your only allowed to Tee into B vent, with a B vent Tee".


Yuri: The furnace BTU is 75K and the water heater BTU is 40K, The water heater vent is 3" diameter and the furnace vent is 4" diameter. The furnace vent runs about 26' up the attic and out the roof.

Honestly, has no one here done this before? I was thinking that this was not such a rare request.

Thanks for all your help and I am looking forward to some answers.
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Old 10-27-2010, 10:19 PM   #13
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Something like this????
But if you look at the photo of the furnace unit in the garage, it does not look like that is B-vent... it is single wall and I thought B-vent was double wall...

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Old 10-27-2010, 10:59 PM   #14
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Move Gas Water Heater to Garage


Looks like your furnace vent is double wall where it penetrates the ceiling then goes single wall from there. Use a 5x4x4 double wall tee hooked to 5" double wall going out the roof. Will look like your drawing but using 5" double wall for everything after the two vents combine.

Woops, not like the drawing. The WH has to go in the side inlet of the tee, not the furnace. Use a wye and it doesn't matter which goes where.

Last edited by Marty S.; 10-27-2010 at 11:02 PM.
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Old 10-28-2010, 04:15 AM   #15
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Move Gas Water Heater to Garage


Quote:
Originally Posted by Dennis1188 View Post
Beenthere: It's a 2-car garage, 30 x 25 x 8, not sure what you mean by "Your only allowed to Tee into B vent, with a B vent Tee".


Yuri: The furnace BTU is 75K and the water heater BTU is 40K, The water heater vent is 3" diameter and the furnace vent is 4" diameter. The furnace vent runs about 26' up the attic and out the roof.

Honestly, has no one here done this before? I was thinking that this was not such a rare request.

Thanks for all your help and I am looking forward to some answers.
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..

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