Quote:
Originally Posted by rubicon
Expansion tanks go about every 3-5 years
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Although the term expansion tank has been used referring to the diaphragm style tank, even by the manufacturers. The correct term is compression tank. Difference being an expansion tank is a vessel open to atmospheric until piped into a water system. A compression tank is a vessel containing a bladder/diaphragm which is pressurized equal to the domestic water pressure in a system, thereby allowing the expanded water to compress into the bladder inside the compression tank.