Water Heater Expansion Tanks: What They Do & Why - Home …
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webJan 15, 2024 · Expansion tanks are safety devices connected to the cold water supply that helps control the thermal expansion of hot water inside a water heater. When water is heated, the pressure can rise beyond the water heaters limit without an expansion tank. Increased pressure can damage the water heater tank, supply pipe joints, and valves in …
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