How to Flush Tankless Water Heater

How to Flush Tankless Water Heater

  • Plumbing
  • Water Heaters
Learn how to flush a tankless water heater for optimal performance. McHale's offers expert tankless water heater service!

In today’s modern homes, tankless water heaters have become a popular choice for providing a continuous supply of hot water while saving space and energy. These efficient appliances, also known as on-demand water heaters, require proper maintenance to ensure they function at their best. One crucial aspect of tankless water heater maintenance is knowing how to flush it regularly. In this comprehensive guide, we’ll walk you through the process of flushing your tankless water heater, explaining why it’s essential and offering troubleshooting tips along the way. Contact McHale’s to learn about tankless water heater services!

What is a Tankless Water Heater?

A tankless water heater is a compact and energy-efficient device that heats water as it flows through the unit, eliminating the need for a traditional water tank. This innovative technology ensures hot water is readily available whenever you need it, without wasting energy by continuously heating a large reservoir of water.

Why Flush Your Tankless Water Heater?

Proper maintenance is key to extending the lifespan of your tankless water heater and ensuring it operates at peak efficiency. Neglecting maintenance can lead to reduced performance, increased energy consumption, and potentially costly repairs down the road. Flushing your tankless water heater is a crucial maintenance task because it helps remove mineral deposits and sediment that can accumulate over time. These deposits can clog the heating elements and reduce the unit’s efficiency. Flushing not only improves performance but also prevents damage to the internal components, ultimately saving you money on energy bills and repairs.

Tools and Materials for Flushing Your Tankless Water Heater

Before you embark on the essential task of flushing your tankless water heater, it’s crucial to be well-prepared. Gathering the necessary tools and materials beforehand will not only streamline the process but also ensure that you have everything you need within arm’s reach. Here’s a checklist of the tools and materials you’ll want to have on hand to make this maintenance task a breeze:

  • Screwdriver
  • Bucket
  • Hose
  • Vinegar or a specialized descaling solution
  • Pipe thread sealant tape

How to Flush Your Tankless Water Heater

If you choose to attempt water heater maintenance yourself, it’s essential to do so with accuracy and care. Follow these steps to flush your tankless water heater:

  1. Turn Off the Power: Locate the power source for your tankless water heater and turn it off. This typically involves shutting off the circuit breaker or unplugging the unit.
  2. Shut Off the Gas Supply: If your tankless water heater is gas-powered, turn off the gas supply valve.
  3. Cold Water Inlet Valve: Shut off the cold water supply to the unit.
  4. Drain Valve: Connect a hose to the drain valve located at the bottom of the unit and place the other end in a suitable drainage area, like a floor drain or a bucket.
  5. Open Hot Water Taps: Open hot water taps in your home to relieve pressure in the system.
  6. Descale Solution: If using vinegar or a descaling solution, carefully pour it into the bucket.
  7. Flush the System: Open the isolation valves on the cold and hot water lines to allow the descaling solution to flow through the system. Let it circulate for about 45 minutes.
  8. Rinse: After descaling, close the isolation valves and disconnect the hose. Flush the unit by opening the cold water inlet valve and allowing clean water to run through the system for several minutes.
  9. Reconnect Power and Gas: Turn the power back on and, if applicable, relight the pilot light on a gas unit.
  10. Check for Leaks: Inspect all connections for leaks and use pipe thread sealant tape if necessary.

Troubleshooting Tips

While flushing your tankless water heater is a crucial maintenance step, sometimes unexpected issues can arise. No need to worry, though – we’ve got you covered with some troubleshooting tips to help you address common problems that may occur during or after the flushing process. These tips will ensure that your tankless water heater continues to deliver hot water efficiently and that any minor hiccups can be resolved with ease. 

  • Low Water Pressure: If you experience reduced water pressure after flushing, check for mineral buildup in your faucet aerators. Clean or replace them if necessary.
  • Strange Noises: Unusual noises may indicate air in the system. Try bleeding the air out by opening a hot water tap until it runs smoothly.

How Often Should You Flush Your Tankless Water Heater?

The frequency of flushing your tankless water heater depends on your water quality and usage. In areas with hard water, it’s recommended to flush the unit every 6-12 months. In areas with softer water, you can extend the interval to 12-24 months. Regularly monitoring your unit’s performance can help you determine the right schedule for your specific situation.

Tankless Water Heater Experts: McHales

If you ever encounter issues beyond your expertise or need professional assistance with your tankless water heater, consider reaching out to McHales. Our team of experts specializes in tankless water heater maintenance, repairs, and installations, ensuring your system performs optimally. Proper maintenance, including regular flushing, is essential to keep your tankless water heater running efficiently and reliably. By following our step-by-step guide and adhering to a maintenance schedule, you’ll enjoy endless hot water and savings on energy bills for years to come. If you’re not confident in flushing your tankless water heater, trust our experts at McHale’s for all your tankless water heater needs. Contact us today!

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By Brenna Thirkell