Temp/Pressure Relief piping

Old 07-22-08, 07:45 PM
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Temp/Pressure Relief piping

I am happy working with copper and want to pipe the PRV to the outside as it should be on a water heater for a friend.
It is a Sheetrock/stucco wall so no problem with making a hole.
But I'm trying to find info about how the pipe should terminate outside.
If I go straight through and have a down section how long should it be.
Also there is wiring going through the wall at the same point at the internal floor level. Looks like phone/cable coax etc rather than power. Would I be OK to just run the PRV pipe down past this or should it go horizontal for a short section?

Old 07-29-08, 05:19 AM
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I don't think the pipe would cause any problems to the coax cable but I would think the down spout should be close to the ground for safety reasons since it would be shooting hot water.
Old 07-29-08, 03:21 PM
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Most codes require that downpipe to terminate between 6" and 12" from the ground.
Old 08-01-08, 06:08 PM
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I would not recommend this if you are in a cold climate. If it were to have a small leak, that went un-noticed, causing it to freeze, and there was a faulty hi limit control on the heater, you may just be able to watch your water heater go through the roof. I know it sounds like a lot, but if you have seen the movies I have about water heaters, I wouldn't want to constrict the opening of the relief valve or RV tube. Including Ice

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