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how to size an expansion tank for a hot water heater
Due to the addition of pressure reducing valves, check valves and anti-return backflow in the community water supply system, new or larger expansion tanks may be required.
These valves isolate the pipes in the home.
The water expands when heated, and in the isolation system, this expansion increases the pressure in the pipe.
The increased pressure can cause leakage and damage to the pipes or fixtures.
Measure water pressure.
Because the water pressure in the same city is different, this step is very important.
The hardware store sells cheap water pressure gauges with hose fittings.
Connect the pressure gauge to the hose bib or outdoor faucet and open the handle.
Make sure the water is not running elsewhere in the House to measure the static water pressure.
Write down the static pressure reading.
Determine the size of your water heater and the temperature of your hot water.
Typical residential water tank
The model of the water heater is 30, 40 or 60 gallons.
The label on the water heater will list the capacity of the gallon.
Write down the capacity.
Look for the temperature setting on the water heater.
On a natural gas or propane gas water heater, the temperature setting is shown on the dial near the gas valve.
Typical settings range from 125 to 140 degrees F.
The dial may have only a few marks, or it may have low, medium, and high labels.
Use 140 degrees if the water heater is set to high.
Low, use 125 degrees, use 130 degrees Fahrenheit.
The electric water heater will also have a similar dial.
Alternatively, use a cooking thermometer to test the hot water temperature on the nearest faucet.
This method requires that the water run long enough to get the maximum temperature and ensure that the tap does not mix cold water with hot water.
Write down the temperature.
The water heater will have temperature and leakage valve (T&P valve)
On the top or side of the tank.
The round label under the handle will list the pressure level of the valve.
Add this pressure level to your information list.
Some calculators require T & P valve pressure ratings.
Calculate the minimum expansion tank size.
With your information, enter one of the calculators provided by the municipal authorities or the manufacturer of expansion tanks.
Additional information is required for the calculator.
According to Watts water technology in the United States, the \"cold water temperature\" should be set to 90 degrees Fahrenheit.
Although the water may be colder, it is mixed with hot water in the water heater.
The water heater is completely emptied and there is only cold water in it, which is rare.
Usually the \"tank pre-pressure\" set by the factory is 40 PSI.
By adding air to the expansion tank until the maximum rated pressure is adjustable (
Usually up to 80 PSI).
The calculator provides a minimum size expansion tank expressed in gallons.
Select the next larger expansion tank if the size is different.
If it is slightly larger than the nearest size, Please adjust the tank in advance
Pressure value to determine if the nearest expansion tank can work.
Do not exceed the maximum pressure rating of the expansion tank.