by Dan Jape of Reliable Heating & Air
A few weeks ago I received a letter from Cherokee County water department informing me they were installing a back flow preventer on our home and letting us know of a need to have a thermal expansion tank installed in our plumbing system to prevent possible damage to our home. All cities and counties have installed or are installing back flow preventers to stop the possible contamination of the water supply in homes. A back flow preventer is a one way valve installed at the connection of your homes water supply and it makes the home a closed system that has no room for expansion which occurs when water is heated. A thermal expansion tank is required to stop the possibility of an over pressure situation that can damage to the water heater and the temperature and pressure relief valve in your home. The letter from the county gave us 30 days to have a expansion tank installed before the backflow valve is installed in our subdivision.







