Quote:
Originally Posted by rhood
My understanding is the the expansion tank is to prevent water hammer and burst pipes. They act as shock absorbers only and are not really necessary.
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Not true. The expansion tank is not a water hammer arrester. The primary purpose is to maintain a constant and safe water pressure in your house and to protect the water heater from developing excessive water pressure. They also protect your plumbing fixtures from damage due to excessive water pressure. Expansion tanks are required by the plumbing code for all new construction.