Water heater expansion tanks were introduced in the late 1950s. Before that, residential water heaters were designed as “closed systems,” where water was stored in a single tank without any way of accommodating the thermal expansion of the water in it. This expansion can lead to pressure bui...
If the T&P valve opens intermittently, or even daily, the cause may be due to normal water pressure expansion. This can be resolved by installing an expansion tank.Read our extensive article on expansion tanks HERE. Drain Valve The drain valve is located near the bottom of the tank and is...
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