I am getting ready to finish our basement, which includes replacing our old hot water heater and moving it to a more logical location in the basement. The house was built in 2005 I have installed water heaters in the past, although I have never seen a hook up like this. I am not sure why there are two cold lines one for the 1st floor and one for the 2nd floor tied in like this. enter image description here

Here is a picture of the new one, more logical location next to the sump instead of the middle of the room with an actual expansion tank enter image description here

  • 2
    Was a handy place to put a tee for second floor/somewhere else?
    – crip659
    Commented Oct 31, 2022 at 17:10
  • That is my only thought, I suppose I could tie in both floors at the old location (2 90s u shape) and tee in off of one of the cold water lines down the line and make my new cpvc (h & c) runs over to the new heater.
    – Ken
    Commented Oct 31, 2022 at 17:20
  • That is the good thing about plumbing. A couple of tees, an elbow or two and some straight pipe and have new lines. Just need to make sure you don't mixed up the hot and cold.
    – crip659
    Commented Oct 31, 2022 at 17:44

3 Answers 3


It is simply that the cold water feed for the second floor was implemented from that convenient spot and a convenient shut off valve for the whole thing.

  • Makes sense. Thanks for the reply.
    – Ken
    Commented Oct 31, 2022 at 17:22

Found the plumber who did the installation when the house was built (shocked) he said it was just a good place to tie everything in. No circulator in this house that is for sure.

Thanks for the answers.


Are you sure there isn't a recirculating pump somewhere?

That's a common reason for "extra cold lines" on a water heater, with the "extra" being the return from recirculation.

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