If you’ve never heard of a water heater expansion tank before, it might sound like nothing more than an accessory for your water heater. Or, maybe it’s some kind of device that expands the capacity of your water heater, so that you can use more hot water.
These are fine guesses, but in actuality, an expansion tank is a safety device that prevents your water heater from being damaged by water pressure. Not just anyone should have one installed, however. Whether you need one depends on how the city has configured your plumbing system.
Don’t worry—we’ll explain what expansion tanks are and if you need one.