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Yes they can go bad but are relatively easy to replace.

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Q: Can expansion tank go bad on water heater?
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Why water boils in expansion tank?

There shouldn't be just water in the expansion tank. If the coolant (50% anti-freeze and water) appears to be boiling in the expansion tank, you may have a bad head gasket or cracked head.


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Water worker sounds like one of those Big Box brands. Chances are it's bad and needs replacing.


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If the bladder is bad in your expansion tank the tank will fill with water. When this happens the pressure in your furnace will exceed 30lbs and your pressure relief valve will blow off.


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Yes, because as the water heats it expands. The water system will then spill over to the expansion tank. The expansion tank is only big enough to store expanded water at the thermostat temperature. When your thermostat doesn't open the water will over heat/ over expand. You will see brownish burnt water marks all over the expansion tank near the overflow hole. Best off just throw away your thermostat you don't really need it.


What do you do with a gas hot water tank when there is no water?

Shut the tank down, so that it does not fire up. Was you water shut off,due to unpaid bill. Is there a break in the water line feed to the house. Did the check valve break, did someone shut off a valve to the heater. For what ever reason, if there is no water flow to the heater, it must be turned off.


Is gas water heater bad if it only produces 15 minutes of hot water?

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What air pressure is there in a pressure tank In a hot water heating system what should the pressure in the tank be?

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Have a 1996 ford contour and its running hot and fluid is coming out of the reserve tank replaced head and gaskets what could the problem be?

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