Tankless Hot Water Heater Maintenance

Nov 9, 2023

Welcome to ScottHarrisonPlumbing.com! We are here to provide you with comprehensive information and expert advice on tankless hot water heater maintenance. As a leading provider of home services, contractors, and plumbing solutions, we understand the importance of maintaining your tankless hot water heater for optimum performance and longevity.

Why is Tankless Hot Water Heater Maintenance Important?

Regular maintenance of your tankless hot water heater is vital to ensure it operates efficiently and reliably. By properly maintaining your unit, you can prevent costly breakdowns, extend its lifespan, and save on energy costs.

1. Flushing the System

One crucial step in tankless hot water heater maintenance is regularly flushing the system. Over time, minerals and sediment can accumulate, causing reduced efficiency and potential damage. Flushing the system helps remove these deposits, ensuring optimal performance.

Start by turning off the power and shutting off the water supply to the unit. Connect a hose to the cold water inlet and place the other end in a drain. Open the purge valves and let the water flow through the unit for around 20 minutes. This process will help remove any build-up and debris, keeping your tankless hot water heater running smoothly.

2. Checking the Pressure Relief Valve

The pressure relief valve is an essential safeguard for your tankless hot water heater. It releases excess pressure and prevents potential damage. Regularly checking and testing the valve ensures its proper functioning.

To test the pressure relief valve, turn off the power supply and the cold water inlet. Place a bucket under the valve and lift the test lever. If water flows freely and stops when you release the lever, the valve is working correctly. If you encounter any issues or the valve doesn't function as intended, consider calling a professional plumber for assistance.

3. Inspecting the Venting System

The venting system plays a crucial role in the safe and efficient operation of your tankless hot water heater. To ensure proper ventilation, regular inspections are necessary.

Check for any signs of damage, blockages, or leaks in the venting system. If you notice any issues, seek professional help to address the problem promptly. Proper ventilation is essential to prevent the build-up of harmful gases, ensuring the safety of your household.

4. Cleaning the Air Intake Filter

An air intake filter helps keep your tankless hot water heater free from dust and debris. Regular cleaning of the air intake filter ensures uninterrupted airflow, preventing clogs and ensuring efficient operation.

Refer to your unit's manual for specific instructions on how to access and clean the air intake filter. In most cases, gently removing the filter and rinsing it with water will suffice. Allow the filter to dry completely before reassembling it.

5. Verifying Proper Gas Supply

If your tankless hot water heater operates on natural gas or propane, it is essential to ensure a proper gas supply. Any interruption or low gas pressure can affect the heater's performance.

Regularly check the gas line and connections for leaks or damages. If you notice any issues, contact a qualified technician to inspect and resolve the problem. A consistent and reliable gas supply is crucial for the efficient operation of tankless hot water heaters.


Maintaining your tankless hot water heater through regular maintenance tasks such as system flushing, pressure relief valve testing, venting system inspections, air intake filter cleaning, and gas supply verification is crucial for its optimal performance and longevity.

At Scott Harrison Plumbing, we specialize in providing top-notch home services, contractors, and plumbing solutions. Our team of experts is well-versed in tankless hot water heater maintenance and can assist you with any related needs you may have.

By following these maintenance steps and relying on our professional services, you can ensure your tankless hot water heater continues to provide you with a constant supply of hot water while maximizing energy efficiency and reducing potential issues.

For more information or to schedule a maintenance appointment, contact us at ScottHarrisonPlumbing.com. We are committed to meeting your tankless hot water heater maintenance needs and providing you with exceptional service.