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Author:
cny plumber (NY)
Hello,
I'm looking for a simple passive way to get faster hot water to fixtures. I would like to remove my 3/4 hot water copper piping and run multiple 1/2 pex lines using a manifold. I have read for best results to install the manifold as close to the hot water heater/tank as possible. That makes sense. My hot water tank has 3/4 copper coming out the top. It is connected with a screw-on type fitting followed by a union and then a shut off valve and then the rest of the piping. My question is: Can I cut the pipe above the union, put a 90 in, and come off with 6 port manifold (6 pex connectors now pointing up) that I can connect the PEX to? Or would this put too much stress on the union connection and risk a leak there?
Here is the manifold that I was planning to solder in.
[pexuniverse.com]
I have done very little pluming, just minor repairs. I don't know how strong a union connection is and if it can handle the minor moment acting on it by the manifold.
Appreciate any advice.
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Author:
DaveMill (CA)
How will your intended design (installing a 6-port PEX manifold) solve your problem (slow hot water to fixtures)? Typical solutions to that problem include insulating all hot water pipes, moving water heaters nearer the fixtures, and installing small heaters in the kitchen or bathroom.
Also, note that your selected manifold is "Compatible with PEX-A tubing only" (expansion PEX). Most of us DIYers use PEX-B (crimped PEX).
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Author:
cny plumber (NY)
My house has 3/4 copper pipes that branch off to 1/2 lines close to the fixtures. It works well as far good pressure and flow. 3/4 inch lines hold a lot of water but the hot usually gets cold prior to the next use and needs to be dumped out the faucet before the hot can refill the pipe and get to the faucet. 1/2 inch pex will hold much less water (its like a third) and decrease my wait time. I estimate I can cut the time in half anyway. Currently the kitchen sink is probably about 30 ft of 3/4 and the master bath is closer to 40 ft of it, but in the opposite direction. I will also save some hot water, but it's the wait the bothers me more.
Yes I bought the pex expansion tool. I plan to resell it after I am done as I will not use it after this project.
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