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Cainman
Replacing an expansion tank

I have a quote of $180 to remove and install a new expansion tank into place and pressurize it to match my house water pressure. This is in addition to the main project of replacing a manifold to my radiant heating system.

My research has found expansion tanks costing from $40 - $100.

How difficult is it to replace and pressurize an expansion tank?
Is the quoted price reasonable?

Thanks.

JLMCDANIEL
Re: Replacing an expansion tank

Not sure where you got the prices but it seems low to me if you are talking about a bladder tank for a well system.
http://www.calibex.com/Amtrol-Well-Tank/zzcalibex2zB1z0--search-html

Jack

johnjh2o
Re: Replacing an expansion tank

Expansion tanks for hot water heating systems are pre charged to work on heating systems. The water pressure in the water system has nothing to do with the expansion tank. The pressure in the heating system is controlled by a pressure reducing valve on the boiler feed. To replace the tank is just a matter of removing the old and screwing in the new. It sounds like they will have the system drained to do your other repairs so changing the tank should take no more then 10 min.

johnjh2o
Re: Replacing an expansion tank
JLMCDANIEL wrote:

Not sure where you got the prices but it seems low to me if you are talking about a bladder tank for a well system.
http://www.calibex.com/Amtrol-Well-Tank/zzcalibex2zB1z0--search-html

Jack

I was under the impression it was the expansion tank on a heating system.

Cainman
Re: Replacing an expansion tank

It is the expansion tank for a water heater.

http://www.calibex.com/expansion-tank/zzcalibex2zB1z0--search-html

Am I correct that the system has to be drained in order to replace the expansion tank?

Thanks.

JLMCDANIEL
Re: Replacing an expansion tank

If it is on a hot water heater, you would need to shut off the water to the WH, release the pressure, unscrew the old and screw on the new. It would then need to be pressurized to 2 lbs less than the water pressure. My question is why do you need to replace the old one?

Jack

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