Thermal Expansion Tanks for Water Heaters

When you're searching for a thermal expansion tank to regulate your water heater's pressure, explore top-quality options at F.W. Webb. We offer water heater expansion tanks in a variety of sizes, tank capacities, diaphragm materials, and measurements; narrow your selection by using our convenient filters. Select from durable copper or steel to ensure the tank exterior holds up under normal wear and tear. We carry expansion tanks from some of the most well-known makers, including Amtrol, Flexcon, Taco and Bell & Gossett.

Frequently Asked Questions

What does an expansion tank do?

The primary purpose of an expansion tank is to prevent the pressure in a water heater from getting too high. When water pressure gets too high, it can damage the heater and other plumbing fixtures. As the pressure goes up, the thermal expansion tank takes it in, then brings it back down to a safe setting.

How long does an expansion tank last?

An expansion tank can last anywhere from five to ten years, depending on the brand, material, size, and use.