Friday, December 27, 2019

What is an expansion tank on a hot water heater

What is an expansion tank on a

What Size Expansion Tank Do I Need? Running out of hot water is an inconvenience and adding extra capacity can be tempting. An expansion tank or expansion vessel is a small tank used to protect closed (not open to atmospheric pressure) water heating systems and domestic hot water systems from excessive pressure. Yet, because expansion tanks were not as necessary in the past as they are today, you may not even know what an expansion tank is, let alone why you probably need one.


Thermal expansion is created during the heating of water, which can lead to problems if the system does not have a way to store some of the excess amounts of water and steam. The excess water volume, instead of causing too much pressure on the plumbing, rushes into the expansion tank and lowers the pressure in the water heater to safer levels.

What could be worse than a cold shower in the morning? The excess water from the water heater flows into this expansion tank and the air in the tank is compressed to make up for the increased water volume. Get a water heater expansion tank installed.


The expansion tank is able to absorb the excess water because it has a rubber-like diaphragm with an air cushion. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer and absorbs excess water pressure caused by thermal expansion. What is an expansion tank, and why do you need one?



The expansion tank serves as a backup system to prevent overworking your plumbing. An expansion tank is a small tank that is generally used to contain excess water pressure within domestic and closed water heating systems. Chances are, the answer is yes. An expansion tank looks like a mini tank or boiler, and typically sits on top of, or adjacent to, the water heater. Add new definition as follows: SECTION 2DEFINITIONS CLEAR -WATER WASTE.


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