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Old 12-18-2010, 10:12 AM   #1
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Location of expansion tank?


I'm going to install an expansion tank in my plumbing system and all of the diagrams I see mention it being placed on the cold line bewteen the HWT and the PRV. Unforunately for me this is not an ideal location due to some duct work. Would it be okay to place the tank downstream of the HWT and my faucets? Seems like it should be okay to me because pressure is pressure but I wanted to ask first.

In my diagram I'd like to place it in location "B" instad of the recommended "A" location. Will this work?
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Old 12-18-2010, 10:24 AM   #2
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Location of expansion tank?


unless your expansion tank is rated for hot water, it should be located on the cold water line. Right before the water tank is ideal, but you can put it in a little way away from it. Also, you can plumb it in with a tee and extend it away from the ductwork... just make sure the tank is supported

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Old 12-18-2010, 10:43 AM   #3
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Location of expansion tank?


I do plan on putting it on the cold water line. Just not between the hwt and prv. I want it in location B instead of A
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Old 12-18-2010, 11:22 AM   #4
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Location of expansion tank?


anywhere in the cold water line will work.
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Old 12-18-2010, 12:40 PM   #5
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Location of expansion tank?


you just have to be sure there is not a valve between the expansion tank and the water heater, at least that is the code.
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Old 12-18-2010, 01:26 PM   #6
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Location of expansion tank?


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Originally Posted by Work4living View Post
you just have to be sure there is not a valve between the expansion tank and the water heater, at least that is the code.
Um no. There needs to be a shut off valve in the cold water supply. Before the expansion tank is ideal for servicing.
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Old 12-18-2010, 01:45 PM   #7
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Location of expansion tank?


The valve is to be located so as to not seperate the heater from the expansion tank. i.e. if you do tank then valve then heater, and the valve is closed seperating the tank from the heater, the system is no longer protected by the expansion tank.
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Old 12-18-2010, 03:40 PM   #8
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Location of expansion tank?


When the city installs new water service they now typically install a meter/backflow preventer/expansion tank combination. There is a shut off before the tank, however if you are just installing a tank, it can go anywhere in the cold water line. If you need to service or change it you can shut off the house main. Lets not over complicate the easy.
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Old 12-21-2010, 03:50 AM   #9
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Location of expansion tank?


Okay that all makes sense. I didn't think it would be a problem but I wanted to check and be sure. Thanks.

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