A water heater expansion tank costs between $90 and $350, with the average cost of $220.

Many water heaters feature an expansion tank to protect the system. Here's what a water heater expansion tank does and how you know if your system needs one.

A thermo-expansion tank — or domestic water-heater expansion tank — is usually a small, air-charged tank with a rubber diaphragm inside that is installed on the water lines of the water heater.

When a water heater is connected to a closed system, an expansion tank must be installed to prevent excessive pressure caused by thermal expansion.

Water heaters with tanks typically have a main tank and an expansion tank. On and around the main tank, you'll find the cold water entry valve, drain valve, temperature and pressure valve with an ...

The expansion tank was mounted horizontally — just hanging there, he said — on the water supply line above the heater. The reader was concerned that the tank would cause stress on the connection.

Tankless & tank water heaters, what’s the difference? We compare the two options, including cost and performance, so you can choose the right one for your home.

All the challenges associated with commercial water heater installs can be overcome with a little advanced planning and basic ...