DIY Home Improvement Forum banner

Help installing water heater drainlines.

6986 Views 13 Replies 6 Participants Last post by  no_Wedge
I am replacing our water heater with a new one, and am having trouble figuring out how to make this configuration legal mainly with the T&P drain line. the current configuration has the T&P going up a little with a flexible copper line to line that connects to a vent stack i believe. The AC condensation pump also pumps to this line, and I am wondering how to make this legal.
I was considering getting a drain pan under it, and running the T&p straight down to it, but I am still left with the AC line and drain pan needing to drain somewhere. There is a bathroom sink behind the wall, and a tub not far from that on the same wall as the stack. here is a little diagram of the setup.

1 - 14 of 14 Posts

· Registered
Joined
·
3,494 Posts
Need more info what is the type of house single, slab on grade, basement, where is the water heater located ?

PS don't run the T/P valve drain to the condensate pump unit or to a sink or tub, if that thing ever opens when someone is in the tub or using the sink it will fry them and it will also melt the condensate unit.
 

· Registered
Joined
·
3,494 Posts
Just install the new water heater on a drain pan and pipe the T/P valve down to the pan with a couple inches off the bottom of the pan. Don't worry about piping anywhere.
 

· Registered
Joined
·
3,494 Posts
I don't know the code where you are so just wait until someone with knowledge of the code gets back to you , they will just wait.

I have seen hundreds of water heaters just piped to a couple inches above the floor with no drains. Not saying that's the way.
 

· Registered
Joined
·
220 Posts
Discussion Starter · #10 ·
I'd drain the pan using a flexible hose to a floor drain.
I know you said you don't have one, but for a house on slab, I'd challenge and say you just haven't found it.

How old is the house?
That might change my answer.
1973 and in this area especially at that era since it is west texas there is no floor drain. no garage near, and it is possible to drain outside, but i would have to go through several studs and brick. Is there another solution?
 

· Premium Member
Joined
·
12,950 Posts
Since you cannot conveniently pipe to the exterior, can you cut into the sink drain below the sink inlet, install a p trap facing the heater and pipe the T&P and AC condensate to that? The condensate might keep the trap primed. You would also eliminate the uphill T&P connection. However, this solution does not address the pan. Is it required or something you want? Is this a gas heater?
 

· Registered
Joined
·
3,494 Posts
I don't like piping it direct I like to see if the T/P valve is leaking or popping so I can correct the problem when I see water in the pan or on the floor if you pipe it direct you could be having a problem for a long time and never notice it.
 
1 - 14 of 14 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top