The water heater expansion tank serves as an overflow receptacle by absorbing excess water volume that occurs when water is heated as well as absorbing fluctuations in the incoming water supply pressure.
Water heater pressure tank.
The tank utilizes a thick diaphragm to keep water separate from pre charged air and to help reduce air loss.
As the temperature increases the maximum working pressure for which the water heater was designed 150 psi can be exceeded.
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This water heater expansion tank stops hot water from backflowing into the cold water line and prevents hot water from escaping through the pressure relief valve and onto the floor.
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A 40 gallon water heater with 80 psi line pressure will build to a pressure of 145 psi with a temperature increase of 16 f.
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The expansion tank serves as a backup system to prevent overworking your plumbing.
That extra water volumeraises the pressure in your water heater to dangerous levels.
Here s what we mean.
You install the expansion tank down the line from the inlet valve that sends hot water into your home.
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.
This condition significantly increases the pressure of water pipes and can lead to damage to pipes household appliances and water heaters.
Water expands by roughly 2 as it heats up from 50 f to 120 f.
When your water thermally expands a water heater expansion tank prevents unwanted increases in pressure.
This valve allows water or steam to escape from the water heater if the temperature or pressure gets.
This ultimately protects it from damage.
Since water expands when it is heated due to thermal expansion the water heater creates extra water volume every time it heats water.
This is called thermal expansion.
Pressurized well tank is pre charged and designed to maintain its air charge for years to provide easy upkeep.
Constant fluctuations in water pressure can be dangerous and they can damage the water heater properly installing a thermal expansion tank can solve all these issues.
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When water is heated inside your water heater it expands.
For example the cold water in a standard 50 gallon water heater expands to 52 gallons when heated to 120 f.
Water heaters come equipped with a temperature and pressure relief valve also known as a tprv.
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