Repeated pressure spikes stress the tank, relief valve, supply lines and fixtures. A dripping T&P valve after a heating cycle is a common sign. An expansion tank gives the extra volume a place to go.
Learn more in our expansion tank guide.
Thermal Expansion
Thermal expansion is the increase in water volume as it heats. In a closed plumbing system that extra volume has nowhere to go, so pressure rises every time the heater runs.
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