How to Flush A Water Heater

“Today, we’re going to show you how to properly flush your water heater. Trevor is here to help demonstrate the process. Let’s get started.”

Connecting Water Hose

“To begin, you’ll need a water hose. Trevor has connected the hose directly to the water heater. It’s important not to confuse draining and flushing your water heater. Draining usually occurs when the water heater needs replacing, but today we’re focusing on flushing. Flushing helps clear out sediment by using the pressure inside the tank to push everything out.”

Valve Clarification

“A common mistake is to think you’ll need to handle the valve at the top during this process. Do not touch this valve; it’s unnecessary for flushing.”

Checking the Water Heater Condition

“When flushing your water heater, first look at the manufacturer’s date. This unit, for example, is brand new, manufactured in May. Since it’s new and doesn’t have a water softener, we’re checking specifically for hard water build-up.”

Capturing Debris

“Although we typically don’t need a bucket, we’re using one today to clearly show you the debris and sediment coming out. This helps illustrate the importance of regular flushing.”

Explaining Hard Water and Calcium Build-Up

“You might notice sand-like particles. That’s actually calcium build-up from hard water. Over time, calcium settles at the bottom, heats up, and hardens into a rock-like substance. Without regular flushing, this build-up grows and can cause your water heater to rattle or rumble.”

Flushing Procedure

“Our goal is to flush until the water runs clear, usually about five to ten minutes. Once clear, simply close off the water flow. It’s straightforward: open, flush clear, then close again. After that, unscrew your hose, just like removing a garden hose from an outdoor bib.”

“Regularly flushing your water heater is simple and keeps it running efficiently. Thanks for watching!”


As homeowners in Texas, we rely heavily on our water heaters for daily tasks, from hot showers to cleaning dishes. One key maintenance task often overlooked is flushing your water heater. Reliant Plumbing is here to walk you through why it’s essential and how simple it can be.

Why Flush Your Water Heater?

Hard water is common across Texas, leading to calcium and sediment buildup in water heaters. Over time, these deposits accumulate, hardening at the bottom of your tank and causing efficiency issues. You might even hear your water heater rattling or rumbling—this is the calcium buildup at work!

Flushing vs. Draining

It’s important not to confuse flushing your water heater with draining. Draining typically occurs when replacing your water heater, while flushing is routine maintenance. Flushing leverages the internal pressure of your tank to remove sediment, helping extend the life of your appliance.

Step-by-Step Guide to Flushing Your Water Heater:

  1. Prepare Your Hose: Connect a garden hose directly to your water heater’s drain valve.
  2. No Valve Adjustments Needed: Avoid touching the pressure valve at the top of your tank; it’s unnecessary for flushing.
  3. Check Your Heater’s Condition: Note your water heater’s manufacturing date. Newer units without a water softener might require checks for early sediment buildup.
  4. Catch the Debris: Though not always necessary, using a bucket can help you visually confirm sediment removal.
  5. Flush Clearly: Allow the water to run until it’s clear, usually for about five to ten minutes.
  6. Finish the Process: After clear water runs through, close the valve, disconnect the hose, and you’re done!

Regular Maintenance Benefits

Routine flushing helps maintain your water heater’s efficiency, reduces noise, and prolongs its lifespan, ultimately saving you money in repairs and replacements.

Reliant Plumbing is dedicated to ensuring your home’s plumbing systems run smoothly. For more tips or assistance, don’t hesitate to reach out to our expert team. We’re always here to help Texas homeowners like you!

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