Question about Amtrol ST-5-C THERM-X-TROL ASME Expansion Tank, 2 Gallon

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I have a Therm x Trol on my water system. It has a small leak in the top. I'm on public water in a subdivision. Do I really need this device? Can I remove it with out harming my home?

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Depends on why it was installed in the first place...

most of the time these are installed to reduce thermal expansion... "hot water into the cold pipes"

I don't know your system, but I would just replace it. removing it could potentially bring back, or cause other problems we are not aware of, the reason it was actually installed.

Posted on Aug 31, 2010

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Posted on Jan 02, 2017

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1 Answer

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Once these start to leak, usually the best solution is to replace the tank. It is corroding and will only corrode more with time. You could try epoxy for a short term fix, something like liquid metal.

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I am loosing water pressure in my shower so I checked pressure at my ST-12 Therm-X-Trol tank hoping it would be 40 but water comes out of the test point and if you tap the tank it feels like it is full of...


you are correct....the rubber bladder inside the tank has leaked by and filled the expansion tank. it will need to be replaced and you also may find boiler or water heater relief valves may blow off until its replaced

Oct 21, 2010 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

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My Amtrol Therm-x-trol tank has dropped 6 to 8 inches since it was installed, and a few drops of water are coming from the washer where is attached to the water heater. It is very heavy now. Could it be...


Sounds like the internal diaphragm has ruptured. The tank should be replaced immediately. You should disconnect the electrical power to the water heater and close off the incoming water supply to the heater. Open a HW faucet to relieve the pressure and remove the tank. Be careful cause you are going to get wet. Replace with a new tank.

Sep 30, 2010 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

Water leaking in basement because there is a small leak in current expansion tank. can we stop water from leaking tonight and still have water to house? and are these tanks easy to replace?


Hi,
For tonight I would set a bucket under it to cathc the water from the leak. The tank will not start to leak much worse in the next few hours...
And, no it is not hard to change the tank. Just messy....:-) Becareful though as the tank may be heavy if the bladder has ruptured...
Simply use two wrenches and unscrew the tank and then tape or dope the threads and screw the new tank back on...just that simple...make sure you get a fresh water exspansion tank and not a heating one...

heatman101

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Short buzzing noise every few seconds from hotwater tank


it maybe that there is a small leak at the connection.try to remove the tank and put teflon tape on the connection.this may fix the problem.if this does not fix the problem,it may be possable that the amtrol has a pin hole in it.this may hve to be replaced.good luck with your project

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1 Answer

Therm-x-trol st-12 leaking


Never seen one leak other from the seam or the top or bottom.

Mar 14, 2009 | Amtrol ST-12-C THERM-X-TROL ASME Expansion...

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