A Step-by-Step Guide on How to Flush Your Water Heater

how to flush water heater


Your water heater is a vital appliance that ensures a consistent supply of hot water for various household activities. Over time, sediment and mineral buildup can accumulate in the tank, reducing its efficiency and potentially shortening its lifespan. To maintain your water heater’s performance and prolong its life, it’s essential to periodically flush it. In this article, we’ll guide you through the process of flushing your water heater in a few simple steps.

Why You Should Flush Your Water Heater

Flushing your water heater is crucial for several reasons. Over time, sediment, minerals, and debris settle at the bottom of the tank. This accumulation can lead to various issues

1. Reduced Efficiency: Sediment acts as an insulator, making it harder for the heating element to transfer heat to the water. This can lead to increased energy consumption and higher utility bills.

2. Shortened Lifespan: The buildup of sediment and minerals can cause your water heater’s tank to corrode faster, leading to leaks and potential water damage.

3. Poor Water Quality: Sediment and mineral deposits can affect the taste and odor of your tap water, making it less appealing for cooking and drinking.

4. Inconsistent Hot Water Supply: Sediment buildup can also lead to uneven heating, resulting in fluctuating water temperatures.

How to Flush Your Water Heater

Flushing your water heater is a relatively simple process that you can do on your own. Here’s a step-by-step guide

Turn Off the Power

For electric water heaters, switch off the power at the circuit breaker. For gas heaters, turn off the gas supply by closing the gas shut-off valve.

Let the Water Cool

Hot water can cause severe burns, so wait for the water inside the tank to cool down before proceeding. This may take several hours, depending on the initial water temperature.

Shut Off the Cold Water Supply

Locate the cold water inlet valve, often located at the top of the water heater, and turn it off. This prevents new water from entering the tank during the flushing process.

Attach a Hose

Connect a garden hose to the drain valve at the bottom of the water heater. Place the other end of the hose in a floor drain, utility sink, or outside where the hot water won’t cause damage.

Open the Pressure Relief Valve

This step is optional but can help with the draining process. Open the pressure relief valve on the top of the tank to allow air into the system, which will help the water flow smoothly as you drain the tank.

Drain the Tank

Open the drain valve at the bottom of the water heater by turning it counterclockwise. Be prepared for the water to be hot and potentially discolored due to sediment. Let the tank drain completely.

Flush and Rinse

Once the tank is empty, you can flush out the remaining sediment. To do this, close the drain valve and turn the cold water supply back on for a brief moment. This will create a powerful surge of water that helps dislodge any remaining sediment.

Repeat as Necessary

If the water runs clear after the first flush, you can consider the process complete. However, if it’s still cloudy or discolored, you may need to repeat the flushing process until the water is clear.

Close the Drain Valve

Once the water runs clear, close the drain valve by turning it clockwise.

Turn the Cold Water Supply Back On

Reopen the cold water supply valve to refill the tank.

Turn On the Power

For electric water heaters, turn the power back on at the circuit breaker. For gas heaters, relight the pilot according to the manufacturer’s instructions.

Check for Leaks

Inspect the area around the drain valve and the pressure relief valve for any leaks. If you notice any, tighten the connections or replace faulty parts as necessary.


Can I flush my water heater myself?

To flush your hot water tank, simply turn on the cold water spigot leading into your hot water tank. Let it run for a few minutes until the water exiting your hose runs clear. This may take a bit. While the water might be running clear and isn’t brown, you may still have some sediment.

Is it necessary to flush the water heater?

In a word, yes. Water heaters – both tanked and tankless varieties – should be flushed at regular intervals. With this proactive maintenance step, the heater runs efficiently for a longer period of time, and service issues are less frequent.


Flushing your water heater is a straightforward maintenance task that can significantly extend the lifespan of your appliance and improve its efficiency. By removing sediment and mineral buildup, you’ll enjoy a consistent supply of hot water while saving on energy costs. Make it a regular part of your home maintenance routine, and your water heater will continue to serve you well for years to come.

Read Also : Breaking Free – A Comprehensive Guide on How to Quit Porn