Water in the domestic hot water system is heated by a water heater-gas, oil, electric, or indirect. The largest use of potable water in the home is usually for hot water for bathing, washing and dish washing. This piping system is usually filled up once and the water is used over and over, only as a medium to convey heat. Some water may be used in a secondary 'closed' piping system, sealed from the potable plumbing system, which connects to a hot water boiler. In a typical domestic water supply system some water is used in the cold water service lines. Because they do their job so well, these backflow devices can contribute to thermal expansion, which can cause serious problems. ![]() When dual-check valves and check valves are installed in water meters, they seal off the household plumbing system from the potable contaminated household water into the public supply. Code Requirements on Thermal Expansion Control in Domestic Service Water Heating Systems
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