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Tankless Water Heater Gas Pressure Problems

Tankless gas water heater pressure needs to be perfect for the device to work properly. A change in your system can result in low gas pressure, and you'll want to check it out right away.

Check Your Tankless Water Heater

Your device needs gas from the line to heat the water, and it's important to use a the right size of gas line to get the right pressure. This is a tricky calculation best handled by a licensed plumber or a gas fitter.

An expert tech will take note of the total demand load, gas pressure, longest length of the gas line, and available make-up air for proper combustion to calculate what your system needs. You can help by taking notes of the error codes that come up on your water heater's screen and showing them to your technician.

How to check your tankless water heater gas pressure

  • Check for an error message on the display of the water heater and write down the error code. Check your owner's manual or the system's website and look for the section on error codes. It should tell you what each error code means.

  • If your system is showing a "Water Heater Not Igniting" or "Returning Flame Failure Message", it means that the pilot light won't light. This could be due to low gas pressure, but there are a number of other reasons that could also interfere with the pilot light. You'll need to call a technician to determine why it won't stay lit.

  • If you suspect that the gas pressure is too low, a technician will have to come out with an instrument called a manometer to measure the gas pressure.

Is there a problem with the gas pressure on your tankless water heater? If there is, you'll want to keep reading. If not, then click here to see if another issue may be causing your problem.

What to Do if Your Tankless Water Heater Gas Pressure Is Low

You need a technician to identify the root of the issue, as several problems could be to blame.

NOTE: This content is for informational purposes only, and HomeX and its affiliates disclaim all liability related to it. If you decide to perform any tasks based on this information, you assume all risks, including the risk of loss or damage to property or personal injury.

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