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Old 07-12-2010, 09:25 PM   #1
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does the hot water heater overflow drain (the piping extending from the top of the appliance) have to exit the home to the exterior of the home?

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Old 07-13-2010, 06:52 AM   #2
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Depends on local code, most do not require that.

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Old 07-13-2010, 08:29 AM   #3
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I have lived in 3 States (Ohio, Florida and Arkansas) and only Florida required this.
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Old 07-13-2010, 08:39 AM   #4
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Actually the Florida Code states in section 504.6.1:

"The relief valve shall discharge full size to a safe place of disposal such as the floor, water heater pan, outside the building or an indirect waste receptor."
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Old 07-13-2010, 09:34 AM   #5
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I have my T&P valve line plumbed to discharge down into a drain pan and IT is drained to under my house in the crawlspace in case there is ever a blowout. If you can get it fairly easily plumbed to the outside, that's they way to go. Otherwise, if it blows inside the house, you are going to have a heck of a scalding flood (although the water heater won't blow up).
Good Luck!
Mike
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Old 07-13-2010, 01:25 PM   #6
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When I did house work in Ocala Florida, the Code required the TP discharge pipe to exit the house and go into a french drain, at least 16" deep (we used a piece of 8" PVC filled with stones) and also have a tee with one outlet facing upwards so the owner could see water escaping, and the other outlet piped down into the drain. Guess this was a local Code.
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Old 07-13-2010, 02:09 PM   #7
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A good reason to always check with your local bldg. dept.
The inspector always has the last word and it's his interpretation of the code that counts.
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Old 07-13-2010, 02:50 PM   #8
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Local codes may apply: http://www.codecheck.com/cc/pg19_20mechanical.html

Page #6: http://www.codecheck.com/cc/images/CC5thEdSample.pdf

Be safe, Gary

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