We just had a plumber do our rough in drains for the slab. There are two chase pipes that will be leaving the hot water heater from in the utility room and going down under the slab. One will be going to the bathroom and the other chase pipe will be going to the kitchen. I know we could have just laid the pex pipe on the ground and poured concrete but I wanted to be able to remove the pipe if need be so the plumber ran me pipes to push both hot and cold pex through together to come up into the wall under the concrete. My question is will the hot and cold temperatures be conflicting side by side ? He said it shouldnt really matter because they separate after they exit the concrete and chase pipe and that I will never notice the difference but thought I would ask because I was thinking of running an additional separate chase pipe.
Hot and cold in same pipe ?
- Thread starter Mudball
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Doherty Plumbing
Journeyman & Gas Fitter
Hmmm this would depend on how long the hot water was running (IE how much contact time does the hotwater line get, while hot, against the cold line). How much of the pipe is actually touching.
No one is gonna beable to give you and answer of yes or no without guessing a bit.
Running another chase pipe is a 100% guarantee though.
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It's a code violation to have the hot and cold water pipes touching.
hj
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pipes
HEre, we would have to insulate the underground hot water line even if it were in a sleeve, so there would not be any question about heat transfer.
HEre, we would have to insulate the underground hot water line even if it were in a sleeve, so there would not be any question about heat transfer.
Jadnashua
Retired Defense Industry Engineer xxx
It makes a lot of both economic and comfort sense to insulate the hot line. Depending on where you are, insulating the cold line can help prevent condensation and dripping in the summer as well. Pex probably transfers heat more slowly than copper, but it still does.
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