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Old 08-04-2010, 04:03 PM   #1
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Run a drain for water heater


Doing a garage remodel and I'd like to plumb a drain line from the WH to the new soil pipe. Is this possible and how would I go about it?

The new room will be on the garage slab and the WH is in the garage, ground level.

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Old 08-04-2010, 05:16 PM   #2
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Run a drain for water heater


A drain line for the tp valve? Or to drain it to clean it?

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Old 08-04-2010, 05:26 PM   #3
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Run a drain for water heater


use a floor drain. Do not connect directly to the waste system
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Old 08-04-2010, 05:34 PM   #4
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Run a drain for water heater


Drain for "what if's", not to clean it. If I was to make a floor drain, where do I run it? Sort of a french drain deal?
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Old 08-04-2010, 06:02 PM   #5
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Run a drain for water heater


I guess my post wasn't clear. Tap into your existing drainage and pipe a new 2" line and floor drain close to your heater. Do not directly connect the T&P to the drainage system.
Another thought, are you close to an exterior wall? Some areas allow you to pipe your T&P outside.
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Old 08-04-2010, 06:25 PM   #6
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Oh, right....I wouldn't connect the drain off the WH itself. My thinking was to place the WH in a pan and pipe the knockout hole to the drain. But is there some sort of check valve/drain cap that prevents the sewer gas from escaping?
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Old 08-04-2010, 06:36 PM   #7
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Run a drain for water heater


My OLD inspector told ME to just run the pipe down to the crawl space and forget about it.... LOL

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Old 08-04-2010, 06:42 PM   #8
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Run a drain for water heater


If you add a pan, you now have 2 indirect drain lines.
1. T&P
2. Pan
Both should pipe seperatly to an approved recepter such as a trapped floor drain
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Old 08-04-2010, 06:45 PM   #9
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Got it! Thanks for the help.
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Old 08-04-2010, 07:55 PM   #10
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Aren't there specific drain requirements for any drain in a garage due to possible gasoline going into the drain ?
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Old 08-04-2010, 08:21 PM   #11
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Quote:
Originally Posted by Scuba_Dave View Post
Aren't there specific drain requirements for any drain in a garage due to possible gasoline going into the drain ?
Different areas have different additions to codes. It pays to make some calls first.
You could perhaps install a hub drain with the rim an inch or 2 above floor level so no debris or gas could be washed down
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Old 08-04-2010, 11:25 PM   #12
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Run a drain for water heater


"The new room will be on the garage slab and the WH is in the garage, ground level." --- Not a bedroom, I hope....

IRC 309.1
5309.1 Opening Protection. Openings from a private garage
directly into a room used for sleeping purposes shall not be
permitted. Other openings between the garage and resi-
dence shall be equipped with solid wood doors not less than
1 3/4 inches in thickness, solid or honeycomb core steel doors
not less than 1 3/4 inches thick, or 20-minute fire-rated doors.


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Old 08-05-2010, 05:40 AM   #13
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My OP was poorly worded. The entire garage will be converted. The WH is in it's own separate framed and rocked cubby under the stairs.
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Old 08-05-2010, 11:58 AM   #14
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Great! We get a lot of garage conversions so I always throw something out there to see if it is safe.... Like making sure to supply combustion air to a gas HWT in an enclosed space through louvered doors or an outside air source, basic things one might forget doing. Local codes vary and someone will usually bring this out to help keep you safe.

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