The 2012 International Residential Code (P2903.4.2) requires the installation of an expansion tank on a hot water tank where thermal expansion may cause an increase in pressure. The tank is only required when the water supply system incorporates a backflow prevention device, check valve or similar device. Similar language can be found in the Uniform Plumbing Code under section 608.3.
Select the links below for more information on expansion tanks.
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