A small pressurized tank installed on the cold water supply line near a water heater to absorb excess pressure caused by thermal expansion when water is heated in a closed plumbing system. The tank contains a rubber diaphragm separating an air chamber from the water side.
A small pressurized tank installed on the cold water supply line near a water heater to absorb excess pressure caused by thermal expansion when water is heated in a closed plumbing system. The tank contains a rubber diaphragm separating an air chamber from the water side.
Required by code in Las Vegas and most jurisdictions when a backflow preventer, pressure-reducing valve, or check valve creates a closed system. Without a thermal expansion tank, repeated pressure spikes can damage water heater tanks, fittings, and appliances. The tank should be replaced every 5-8 years.
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