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

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Brief Motor boat sound transmits thru the house when kitchen,bath,or shower first turned on.How do I trouble shoot the thermal expansion tank Amtrol ST 5.

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The easiest way I know of is to remove cap from air valve on top of tank and check pressure with tire gauge.If you get water out of valve then air bladder is bad and tank will need to be replaced. If you don't get water but no pressure then reinflate to 3-5 PSI. Hope this helps. Thanks

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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Shower goes cold intermittently like there is a restriction in hot water delivery. Plenty of hot water when it comes back, but the cold blast is not fun. No shortage of hot water for long showers or...


Has nothing to do with the expansion tank, the expansion tank whole enough air so that when the heater heats the water it does not build up pressure. You know from school that you can compress ait. you CAN NOT compress water. When you haet water it expands until it turns to steam. So lets rule that out.

First look at all the plumbing in the house where there is a cross conection. This would be like a shower valve that has a personal shower head on it. and you turn of the water using the personal shower handle and not the valve at the wall. This then would let cold water to go into the hot water side piping.

Most people do that with out knowing it at the laundry sink. they put a hose on to was the dog and forget to turn off the faucet and then BANG cold water in the hot side.

Go around the house and turn off all the faucets and valves by using the handles. no add on things.

Now last could be the shower valve itself. . Do this happen in just one shower or all of them???

If its just the one and you spend the day doing the walk around, even check the bidet if you have one

its the valve. you need repair to that.

Best of luck in your hunt Tom

Sep 08, 2011 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

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...

1 Answer

Lots of water on basement floor at pressure tank.


sounds like the bladder tank at the well is ruptured this will cause pressure surge, and pump short cycling, and needs to be replaced asap.

Mar 28, 2010 | Amtrol ST-12-C THERM-X-TROL ASME Expansion...

1 Answer

When the water stops flowing, there is a sharp-thud sound presumably in the unit.


If your thermal expansion tank is older than three years, it is probably time to replace it. There is a diaphragm inside the tank that goes bad over time. Before replacing this tank, if you have recently purchased a new washing machine, this may be the problem if it does not have hammer arrestors on it as well.

Nov 18, 2009 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

I have an Amtrol 109 tank on my boiler mounted horizontally (all the literature shows the tank mounted vertically). Lately, the pressure on the boiler slowly bleeds off. I've been told the Amtrol tank may...


If you are losing boiler pressure, it is probably not the expansion tank. Most of the time when these go bad they fill with water and cause a increase in boiler pressure, especially when the boiler is running. If you put a tire gauge on the end of the tank it should read between 10 and 15 psi. If this is the case then the expansion tank is fine. If the tank is fine then you may have a leak somewhere in the system. The perculating that you refer to could also be from the boiler being under filled. Make sure all zones are purged of air and the boiler pressure reads around 12 psi on the gauge. Hope this helps

Oct 24, 2009 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

2 Answers

Running out of hot water with Vulcan Freeloader 300


hi i need help with mi Vulcan 300 hot water main gas pressure...
our kitchen tap got broken and we turn off our main water pressure in front off our house and now our hot water gas not working ....please help
thank you ...

Sep 24, 2009 | Water Heaters

1 Answer

Air in hot water lines only after installing thermal expansion tank. tank is mounted below water line .


Does you system have an auto air vent - has a cap like tire valve. cap should be left loose.

Mar 05, 2009 | Amtrol ST-12-C THERM-X-TROL ASME Expansion...

1 Answer

How do I change a amtrol thermal expansion take, Is it as easy to unscrew and put the new one after shutting of the water supply


Yes. After attaching the new one,check air preasure with a tire gage to match the recomandation that come with the tank.

Feb 23, 2009 | Amtrol ST-12-C THERM-X-TROL ASME Expansion...

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