The Elusive Pressure Loss Conundrum: Why Does My Tankless Water Heater Go AWOL?

If you’re experiencing a persistent loss of pressure in your tankless water heater, you’re not alone. This issue can be frustrating and inconvenient, but it’s often caused by a few common problems. In this comprehensive guide, we’ll explore the potential reasons why your tankless water heater keeps losing pressure and provide practical solutions to help you resolve the issue.

1. Clogged Water Filter

The water filter in your tankless water heater is designed to remove sediment and debris from the water supply. Over time, these particles can accumulate and clog the filter, restricting water flow and reducing pressure. To solve this issue, replace the water filter regularly, typically every six months to a year.

2. Scale Buildup

Hard water contains dissolved minerals, such as calcium and magnesium, which can form scale deposits inside the water heater. Scale buildup can narrow the water passages and reduce water pressure. To prevent scale buildup, consider installing a water softener to remove minerals from the water supply.

3. Faulty Pressure Relief Valve

The pressure relief valve is a safety device that releases excess pressure in the water heater if it exceeds a safe limit. A faulty pressure relief valve can leak water, causing a loss of pressure. To check if the pressure relief valve is malfunctioning, place a bucket under the valve and open it slightly. If water flows out, the valve needs to be replaced.

4. Air in the Water Lines

Air trapped in the water lines can cause pressure fluctuations and flow restrictions. To remove air from the lines, open all the hot water faucets in your home and let them run until the air is released and a steady stream of water flows out.

5. Inadequate Water Supply

If your water supply is not providing sufficient pressure, it can affect the performance of your tankless water heater. Check the water pressure at a faucet closest to the water heater. If it’s below the recommended pressure (typically 20-60 PSI), you may need to adjust the pressure at the main water supply or contact a plumber to investigate the cause.

6. Leaking Pipes or Connections

A leak in the water pipes or connections can cause a loss of pressure. Inspect the pipes and fittings around the water heater for any visible leaks or water stains. Tighten any loose connections and replace any damaged pipes as needed.

7. Worn-Out Check Valve

The check valve in the water heater prevents water from flowing back into the cold water supply line. A worn-out or damaged check valve can allow water to flow back, reducing pressure. Replace the check valve if it’s not functioning properly.

Wrapping Up: Resolving Your Tankless Water Heater Pressure Issue

Losing pressure in your tankless water heater can be a common problem, but it’s usually caused by a few specific issues. By following the troubleshooting steps outlined in this guide, you can identify and resolve the underlying cause, restoring the pressure and ensuring the efficient operation of your water heater.

Frequently Asked Questions (FAQs)

Q: How often should I replace the water filter in my tankless water heater?
A: Replace the water filter every six months to a year, or more frequently if you have hard water.

Q: Can I use a water softener to prevent scale buildup?
A: Yes, installing a water softener can help remove minerals from the water supply and prevent scale buildup in your water heater.

Q: What should I do if I suspect a leak in my water pipes or connections?
A: Inspect the pipes and fittings for visible leaks or water stains. Tighten any loose connections and replace damaged pipes as needed.