The need for a thermal expansion tank came about by the city adding what is called a “check valve” on the city water meter installed at each house. This makes each home what we call a “closed” system. Meaning that water can flow in but once in the system past the check valve it cannot come back into the city system.
This type of system would be fine if it was just cold water, but the heating of the water in the water heater causes the water molecules to expand and cause extra pressure on your pluming system, in some cases expanding and contracting your water heater and pipes. This wears out water heaters, toilet fill valves, and faucets faster than normal. The state has made it mandatory for all new installations and retrofits to have a thermal expansion tank installed on your water system between the cold water supply and the water heater. If you do not have one of these you will want to have one installed on your system to help prevent any more undue stress on your plumbing system.
Contact us to schedule a time to have one installed in your home: 435.750.0880