Professional Plumbing Tips

What is a Thermal Expansion Tank?

What is that small tank above my water heater?  I hear that question a lot.  The answer is it's a thermal expansion tank.  But what is that?  Simply put, when your water heater is on, as it heats the water, it expands (i.e. thermal expansion).  The tank gives that added pressure a place to go instead of building up in your plumbing system.

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