![]() Without inflated water tanks, the water will have nowhere to go. What happens if your water heater does not have an expansion tank? ![]() When do you need an expansion tank for a plumbing system?Īn expansion tank is most critical in closed plumbing systems, where some form of pressure-limiting valve or back-flow valve prevents the expanding water from backing up into the municipal water main. 4 Use the threaded T- fitting, Teflon tape, and pipe wrench to make the watertight connection. 3 It is recommended to install the thermal expansion tank on the cold water line, horizontally and close to the water heater. 2 Check the pressure of air inside the thermal expansion tank. ![]() How to install a thermal expansion tank in your home?ġ Check the water pressure in your home. When putting an expansion in an abnormal position (specifically sideways or horizontally), make sure to support the tank. ![]() Whether oriented uprightly, horizontally, or even upside down, the expansion tank will function properly without any adverse effects. Can an expansion tank be installed upside down?Įxpansion tanks can be installed in any direction. Often the expense of the thermal expansion tank is included in the cost of the new water heater. The cost to install a thermal expansion tank can range from $300 to $400.
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