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dluna11w · Jul 19, 2009, 10:17 PM

Part of a major remodel that I am doing requires me to move the utility room further away from the main water supply feed and run new water lines to every fixture. I am going to be using a pex manifold in this system. Because of a couple different reasons that I won't waste your time explaining (unless you need this info to give advice), I would like to plumb the water in the following order:

Main water line coming in, then TEE cold into hot water heater, then TEE into cold side of manifold (hot line could come strait in to the manifold from the heater), then TEE into pressure tank, then run the open end of the TEE out to a hose bibb.

I have searched and searched for proper location of the pressure tank and have yet to read anything about not being able to have the pressure tank come in after you have hooked into the water heater and / or pex manifold. Will this work?

Originally I was going to go main line coming in, tee into pressure tank, tee into pex manifold, tee into water heater, end on out to a hose bibb... but the above installation would be MUCH cleaner and easier based on the layout of the room and house I am working with. Thanks in advance!

speedball1 · Jul 20, 2009, 05:10 AM

You've given us a very good description but left out the source of the water.
Pump or city water? If city water why the pressure tank? Or are we talking about a expansion tank? Please explain. Tom

dluna11w · Jul 20, 2009, 07:42 AM

Oooppps. Sorry about that. The source is a well.

speedball1 · Jul 20, 2009, 08:35 AM

Here are two typical hookups. He pressure tank should be installed directly upstream from the pump. Good luck, Tom

dluna11w · Jul 20, 2009, 09:01 AM

Thank you for your response.

The pump is down in the well so the only thing I will have in the utility room is a control box, pressure tank, and pressure switch hooked up to the pressure tank. (and water heater and pex manifold)

Based on your picture and comment, it sounds like I must tee into the pressure tank from the supply line before I tee into the manifold and water heater.

One last follow up question: After running down into the pressure tank, will it matter if I run the cold supply into the water heater before the manifold or after?

Basically, looking at the wall where the manifold will be placed, the water supply comes in from the right. Then all of the lines will go back to the right to all of the fixtures. The output of the water heater is on the left of the tank and my plan was to use a 24" adapter to go from there directly to the manifold. The pressure tank will have to be on the right and the heater to its left. I've never used pex ( no surprise probably :) ) but it seems like I'll need plenty of room on my wall to keep from stressing the pex fittings. Since I must go to the pressure tank first, it would help to go to the heater before the manifold... but I don't want to have supply problems at the fixtures when I complete all of this.

THANKS again.

speedball1 · Jul 20, 2009, 11:26 AM

Another thing that wasn't mentioned. A submersible pump,(see image).
Same hookup. The pressure tank will install before the service enters the house main.

One last follow up question: After running down into the pressure tank, will it matter if I run the cold supply into the water heater before the manifold or after?

It shouldn't make much difference as long as the heaters supplied off the house main. Good luck, Tom