Plan the perfect garden with our interactive tool →

The Gas Pressure Required for Pool Heaters

Hemera Technologies/AbleStock.com/Getty Images

Pool heaters are often heated via natural or propane gas, which means the heater must have enough gas pressure to operate properly. If the pool heater does not have enough gas pressure, a variety of problems may occur, so understanding the typical gas pressure necessary to operate the pool heater can help avoid potential issues.

Adequate Gas Pressure

While the pool heater is in operation, take a look inside the pilot light window, which is usually on the control panel or front of the pool heater. The pilot light should not waver and should be blue in color. If the pilot light is yellow, the air opening in the pool heater is likely restricted and the gas pressure is too high. If the pilot light is low or uneven, the gas pressure is probably too low.

Gas Pressure Regulator

Almost all pool heaters have a gas pressure regulator, which is both preset and sealed to prevent accidental changes in gas pressure. The gas pressure regulator is generally set at 4 inches water column (WC) for natural gas and around 10 or 11 inches WC for propane gas. WC refers to a pressure measurement that is based on an inch-wide tube of water with a hole on the bottom. The taller the water column, or tube, the higher the pressure rating, or WC. Do not attempt to change or open the gas pressure regulator on the pool heater, as this may cause a gas leak or even a potential explosion.

  • While the pool heater is in operation, take a look inside the pilot light window, which is usually on the control panel or front of the pool heater.
  • Almost all pool heaters have a gas pressure regulator, which is both preset and sealed to prevent accidental changes in gas pressure.

Gas Valve Pipe

Extending between the gas valve and the heater burners is a pipe that has a small pipe plug. You can check the existing gas pressure at this connection point by using a manometer, which is available at many hardware or pool supply stores. Connect the manometer to the pipe plug and take the gas pressure reading, which should read between 3.7 inches and 4.0 inches WC for natural gas and 10.5 inches and 11.0 inches WC for propane gas.

Adjusting the Gas Pressure

If the gas pressure reading is too low or too high when using the manometer, remove the seal on the gas valve adjustment screw. Then turn the adjustment screw in a clockwise direction slightly if you need to increase the pressure or counterclockwise slightly if you need to decrease the pressure. Take another reading with the manometer before making additional adjustments. Always remember to make small, gradual changes to the gas pressure, as large swings in pressure can cause a leak or other possibly dangerous situation. Contact your pool heater manufacturer or another qualified service professional for assistance or with any questions.

  • Extending between the gas valve and the heater burners is a pipe that has a small pipe plug.
  • If the gas pressure reading is too low or too high when using the manometer, remove the seal on the gas valve adjustment screw.

Related Articles

Troubleshooting a Craftsman Lawn Mower 6.5
Troubleshooting a Craftsman Lawn Mower 6.5
John Deere 850 Specs
John Deere 850 Specs
How to Use HTH Chlorinating Granules
How to Use HTH Chlorinating Granules
How to Remove Tannin From a Pond
How to Remove Tannin From a Pond
25 Meter Swimming Pool Specifications
25 Meter Swimming Pool Specifications
How to Start a Gas Lawn Mower
How to Start a Gas Lawn Mower
How to Fill an Above Ground Pool
How to Fill an Above Ground Pool
Briggs & Stratton 16 HP OHV Specs
Briggs & Stratton 16 HP OHV Specs
Kohler 18 HP Magnum Twin Specs
Kohler 18 HP Magnum Twin Specs
How to Clean a Hayward Pool Heater
How to Clean a Hayward Pool Heater
Swimming Pool Piping Specifications
Swimming Pool Piping Specifications
Garden Guides
×