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How to Flush a Water Heater


March 8, 2024


A Crucial Part of Home Maintenance

At The Plumbing Joint, we understand the importance of maintaining your home’s water heater for optimal performance and longevity. One crucial aspect of water heater maintenance is flushing, which helps remove sediment buildup and ensures your heater operates efficiently. In this guide, we’ll walk you through the process of how your plumber will flush a water heater so you can keep the hot water flowing in your Renton, WA home.

Why Flush Your Water Heater?

Over time, sediment can accumulate at the bottom of your water heater tank. This buildup can reduce the unit’s efficiency, leading to increased energy consumption and potential damage to the heating element. Flushing your water heater helps eliminate this sediment, allowing your system to work more effectively and extend its lifespan.

Why Your Plumber Should Flush Your Water Heater

Having your plumber flush your water heater instead of attempting it yourself is crucial for several reasons. Firstly, plumbers possess the expertise to navigate the intricacies of water heater systems, ensuring a thorough and effective flushing process. They can identify and address potential issues, such as sediment buildup or faulty valves, which may go unnoticed by an untrained individual. 

Additionally, professional plumbers prioritize safety measures, minimizing the risk of accidents or damage to the unit. DIY attempts may lead to improper flushing, leaving behind sediment that can compromise the heater’s efficiency and lifespan. Entrusting this task to your plumber guarantees a meticulous and reliable procedure, ultimately preserving the optimal performance and longevity of your water heater.

How Your Plumber Flushes Your Water Heater

Power Down the System

Your plumber will prioritize safety by shutting off the power to your water heater. If it’s electric, the breaker will be deactivated. For gas heaters, the control knob will be switched to the “pilot” setting.

Seal Off the Water Flow

Next, your plumber will locate the cold water supply valve and close it off. This step prevents any fresh water from entering the tank during the flushing process.

Hose Connection

Your plumber will affix a hose to the drain valve located at the tank’s base while ensuring the other end of the hose is directed towards a floor drain or outside area.

Activate the Pressure Relief Valve

To promote a smooth water flow during the draining phase, your plumber will raise the pressure relief valve to introduce air into the tank.

Draining Operations

The drain valve will be unlocked by your plumber, allowing the water to exit the tank. Caution is exercised as the water may be hot. Your plumber will patiently wait for the tank to drain completely.

Rinse and Repeat

Your plumber will temporarily switch the cold water supply back on to agitate any remaining sediment. The draining process will be repeated until the water runs clear.

Secure the Valves

Once the water runs clear, your plumber will close both the drain valve and pressure relief valve. Switching on the cold water supply will replenish the tank.

Power Restoration

For electric heaters, your plumber will reactivate the breaker. For gas heaters, the control knob will be adjusted to the preferred temperature.

Contact The Plumbing Joint for Professional Assistance

For professional assistance with your water heater flush, don’t hesitate to contact The Plumbing Joint in Renton, WA. Our team is here to help with all your plumbing needs. Ensure your water heater continues to perform optimally by scheduling a maintenance service today!