Water Heater Expansion Tank?
Dennis F2018-12-29T06:19:46+00:00What is Thermal Expansion? When water is heated it expands. For example, water heated from 90°F to a thermostat setting of 140°F in a 40 gallon hot water heater will expand by almost one-half gallon. This is because when water is heated, its density decreases and its volume expands (see below). Since water is not