How to Remove Sediment from a Water Heater: A Comprehensive Step-by-Step Guide

Does your water heater produce less hot water than usual, or does it make strange noises? If so, sediment might be the culprit. This accumulation of minerals and debris, commonly referred to as sediment, settles at the bottom of your water heater tank over time, reducing its efficiency and potentially causing damage. Learning how to remove sediment from a water heater is crucial for its optimum performance.

Understanding and Identifying Sediment Buildup

Sediment buildup is a widespread issue that can drastically affect your water heater's performance and efficiency. Understanding the causes and consequences of sediment, and knowing how to identify it, is crucial for maintaining a well-functioning water heater.

Impurities and minerals in the water supply often lead to sediment buildup. These particles eventually settle at the bottom of the tank, especially if the heater isn’t flushed regularly or the temperature is set too high.

This sediment then acts as an insulator, preventing efficient heat transfer to the water, resulting in increased energy usage and longer heating times. Signs that indicate the presence of sediment include a drop in hot water pressure or flow rate, as well as popping or rumbling noises caused by heated sediment trapped in the tank.

How to Remove Sediment from a Water Heater

View this DIY video to learn how to flush the tank in your hot water heater:

Note: If you haven't drained your water heater's tank for several years or your water heater is over 3 years old and you've never drained its tank, we don't recommend draining the tank because sediment buildup likely will clog the tank drain—preventing water from flowing out of the tank.

Here are the written steps for flushing sediment from the water heater that are shown in the above video:

1. Turn off your water heater's power supply. This is extremely important because the heating elements can break if they turn on when the tank is empty.
2. Connect a garden hose to the drain valve at the bottom of the tank. Use a heavy-duty hose that won't be damaged by hot water.
3. Place the other end of the hose in a suitable drainage area or a floor drain.
4. Open the drain valve and let the water flow until it runs clear. Water will start to flow out of the garden hose, flushing out the sediment. After a couple of minutes, turn on the hot water in the kitchen. This will create an air gap in the pipes that will force the remaining sediment out of the water heater, after you turn off the water supply later. Note: If you drain hot water out into your yard, it can kill a patch of grass in some lawns. To prevent this, shut off electrical power to the water heater and run your hot water faucets inside the house to drain most of the hot water out of the tank before your complete steps 2, 3 and 4.
5. Turn off the cold water supply valve above the water heater. This will also stop the flow in the kitchen sink faucet, but be sure to leave that kitchen sink hot water faucet open.
6. The water and sediment will now start draining faster, because gravity and pressure are helping us out. You can open the T&P relief valve if the water’s not draining fast enough. Note: If the hose gets clogged during the draining process, you can use a shop vacuum to unclog it. Be careful, that water is hot.
7. Once the water stops draining, you can open the water heater cold water supply valve briefly to give the tank another quick flush and remove any remaining sediment. Then close the cold water supply valve again.
8. Once the tank has drained completely, close the drain valve and disconnect the water hose. Wear gloves to protect your hands. The drain hose fitting will be hot.
9. Close the T&P relief valve is you opened it when draining and flushing the tank.
10. Open the water supply cut-off valve for the water heater and refill the tank. As the water heater fills up, you’ll start hearing your open hot water faucet in the kitchen spitting and sputtering as air is purged from the water heater. Don’t turn the kitchen sink hot water faucet off, until a full stream of water starts to flow again. When you see a steady stream from the kitchen hot water faucet, you know that all the air is out of the water heater and the tank is full of water.
11. Reset the house circuit breaker for the water heater to restore power.

Regular sediment removal from your water heater improves its efficiency and lifespan.

Preventing Excessive Sediment Buildup

Here are some expert tips on how to keep your water heater running efficiently:

• Flush your water heater annually to remove any sediment at the bottom of the tank.
• Check the anode rod yearly and replace it if it's significantly corroded. This rod attracts corrosive elements, protecting the tank from rust, and if worn out, it can contribute to sediment buildup.
• Set your water heater's temperature between 120-130°F to help minimize sediment formation.
• Install a sediment filter to trap particles before they settle and accumulate in the tank.

With these preventative measures, you can maintain your water heater's efficiency, reduce sediment-related problems, and ensure a steady supply of hot water in your home.

When your water heater breaks down, trust Sears Home Services to repair your water quickly so you can get back to your normal household routines. Our experienced technicians have the training and expertise to fix any brand and type of water heater.