Do you allow the TPR to discharge into the WH pan?

[David P. OKeefe]

Originally Posted by sfogarty

Why can you allow it to discharge onto the cement floor in a garage? It will still splatter all over the floor, an 18 inches higher will make a bigger mess. I would think it is a safety issue period, unless it discharges into a plumbing drain.

The TPR drain would still extend to within 6 inches of the floor.

[Wayne B. Wilson]

Yep Sean you find that all the time here. even with new homes in Knoxville, Code approves it. it has to be 6 inches though. I have seen dumped just out the wall ( of course near a Patio ) be a nice surprise have a beer on the patio . In my short life of 54 only seen 3 discharge. 1 tank blow. which is not a pretty sight. We use to test these valves every 3 months for the company i worked for. On boilers we even did a preasure test to see if they would pop. Problem most home owners do not know the dangers that exist. I inform them . we used to say it is equal to one case of dynamite that normally gets their attention.

[David C. Macy]

I do not get why you can not allow the TPR blow tube to discharge into the catch pan. (Also did not know until I was looking at the plumbing course)

In the picture below would you note this as a missing air gap for the TPR relief.

[Joe Funderburk, CMI]

Originally Posted by dmacy

I do not get why you can not allow the TPR blow tube to discharge into the catch pan. (Also did not know until I was looking at the plumbing course)

In the picture below would you note this as a missing air gap for the TPR relief.

Like the course said, the pan drain doesn't meet the definition of an indirect waste receptor.

In your photo, one going to the pan would be OK, provide there isn't some adjacent flooring that could be damaged by a leak or discharge. The pan isn't even required, since the floor is concrete (if no damage would result). The pan serves no purpose whatsoever because the drain isn't hooked up. The TPR into the floor drain isn't required...it can go straight to the concrete (if no damage would result).