That extra water volumeraises the pressure in your water heater to dangerous levels.
Water heater pressure tank.
Water expands by roughly 2 as it heats up from 50 f to 120 f.
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.
Since water expands when it is heated due to thermal expansion the water heater creates extra water volume every time it heats water.
Water heaters come equipped with a temperature and pressure relief valve also known as a tprv.
This condition significantly increases the pressure of water pipes and can lead to damage to pipes household appliances and water heaters.
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As the temperature increases the maximum working pressure for which the water heater was designed 150 psi can be exceeded.
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.
The tank utilizes a thick diaphragm to keep water separate from pre charged air and to help reduce air loss.
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When your water thermally expands a water heater expansion tank prevents unwanted increases in pressure.
This is called thermal expansion.
The expansion tank serves as a backup system to prevent overworking your plumbing.
This valve allows water or steam to escape from the water heater if the temperature or pressure gets.
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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.
Here s what we mean.
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Handling of the damaged plumbing system will be very stressful so installing the expansion tank will be a good way to avoid unnecessary pressure.
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.
The tank has two sections that are separated by a rubber valve.
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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.
For example the cold water in a standard 50 gallon water heater expands to 52 gallons when heated to 120 f.