Turn off power or gas first to prevent damage or injury while draining your water heater.
Jump to insightOpen a hot faucet to break the vacuum and help the tank drain faster and more completely.
Jump to insightLet the water cool before draining to avoid burns and ensure a safer maintenance process.
Jump to insightDrain your hot water heater at least once per year to avoid sediment buildup, and every four to six months if you have hard water.
Jump to insightHow to drain a water heater
Draining your water heater helps flush out buildup and keep it running efficiently. Follow the steps below to do it safely.
1. Determine your water heater type
Water heaters come in two basic types: tank-style and tankless. Both types can be fueled by electricity, propane or natural gas.
Before draining your water heater, you need to determine its type. Chances are you already know this, but if not, here’s how to identify whether your heater is tank-style or tankless, and how it’s fueled.
- Tank-style heaters are large and cylindrical in shape. Electric tank-style heaters will be hardwired into your home’s electrical system with a cable. Propane and natural gas-fueled models will have an incoming gas line plugging into the heater with a shut-off valve.
- Tankless water heaters are much smaller, generally rectangular and wall-mounted. Like tank-style units, they’ll either have an incoming gas line or be wired into your home’s electrical system.
2. Gather your materials
You’ll need the following materials:
- Garden hose of sufficient length to reach your floor drain or bathroom drain
- Large oil drain pan (if a floor drain or bathroom drain isn’t available)
- Adjustable wrench or slot screwdriver (depending on the configuration of your drain valve)
3. Turn off power or gas supply
For propane or natural gas-burning water heaters, begin by turning off the gas valve and extinguishing the pilot light. If you have an electric heater, locate the electrical breaker it’s connected to on your service panel and flip it to the off position.
4. Shut off the cold water intake valve
Shut the cold water intake valve to prevent water from entering your heater while it drains.
5. Connect a hose to the drain valve
Connect a garden hose to the drain valve near the bottom of your heater (this applies whether your unit is tank-style or tankless). Route the other end of the hose to the nearest floor drain or shower stall. If you don’t have a household drain handy, you’ll need to drain your water heater into a bucket instead.
For tank-style heaters, you may need to skip the hose and drain directly into a large, clean oil pan since a regular bucket will likely be too tall. Keep in mind that if you use a hose, its draining end needs to stay below the heater’s drain valve so gravity can take effect.
6. Open a hot faucet to break the vacuum (for faster draining)
To help the water drain more quickly, open one or more hot water faucets in your home. This breaks the vacuum pressure inside the tank and allows air to enter, speeding up the flow.
7. Drain the water heater
For tank-style heaters, wait an hour or two for the water to cool before draining. When your hose or bucket is positioned properly, use an adjustable wrench or screwdriver to open your water heater’s drain valve.
Allow water and sediment to drain out, keeping an eye on the flow. If you’re using a bucket, you’ll need to periodically close the drain valve when the bucket is full, dump it outside or down the nearest drain in your home, then return with the empty bucket and repeat the process. Continue draining until the water is fully clear and sediment-free.
8. Close the valve and refill the heater
Disconnect the hose and close the drain valve once all the sediment has been drained from your heater. Open the cold water inlet valve to refill your heater, then switch the breaker back on, or re-ignite the pilot light and open the gas supply valve.
» READ MORE: How much does it cost to replace a water heater?
Safety precautions to take when draining a water heater
Although draining a water heater isn’t complex, it’s important to follow proper safety precautions.
The first step to the safe draining of both propane and natural gas-fueled heaters is ensuring gas can’t flow into your heater during draining. “Extinguish the pilot light and shut off the gas valve first,” said Little.
Another safety issue stems from the fact that the water in a tank-style unit will still be hot even after you’ve disconnected the power or shut off the gas supply. “Be cautious, since the water can scald you,” said Little. If you’d rather eliminate burn risk entirely, wait an hour or two to give the water in your tank-style heater time to cool.
Tips for maintaining your hot water heater
Take a look at a few ways you can maintain your water heater.
Keep your water heater working well by draining it at least once a year or every four to six months if you have hard water.
- Consider running vinegar through your tankless water heater twice a year to dissolve mineral deposits and improve efficiency.
- Replace the anode rod in your tank-style heater at least every five years, and maybe more often, depending on how quickly it corrodes.
- Consider adding demineralizing equipment to your water system if you have hard water. This makes things easier on your water heater and allows draining to happen less frequently.
- Get a more accurate perspective on the sediment in your water during draining by placing a white cloth over the top of your bucket to collect the sediment while letting the water drain through.
- If you’ll be traveling and have a tank-style heater, shut it off if it’s electric to save energy and wear and tear. If your heater is gas-powered, switch it to away mode to keep the pilot light burning, but avoid heating water.
» LEARN: Best home warranty for plumbing
FAQ
How often should you drain your water heater?
Most experts recommend draining your water heater once a year to flush out sediment and mineral buildup. If you live in an area with hard water, you may need to do it every six months to keep your system running efficiently and prevent damage.
What are the warning signs you need to drain your water heater?
Signs your water heater needs draining include rumbling or popping noises, cloudy or rusty water, or reduced hot water pressure. These symptoms often mean sediment has built up inside the tank, making it harder for your heater to work properly.
What if my water heater has no drain valve?
Some compact or older models don’t include a drain valve. In that case, you can connect a small pump to the cold water inlet line to help push water out through a disconnected hot water line, or contact a licensed plumber to safely install a drain valve for future maintenance.
What are the most common problems when draining a water heater?
Common issues include clogged drain valves caused by sediment buildup, slow draining due to a vacuum inside the tank and leaks from worn-out valves. Opening a hot water faucet before draining can help prevent vacuum pressure and speed up the process, while replacing an old or leaky valve may be necessary for a smooth drain.
What happens if I don’t drain my water heater?
Over time, sediment collects at the bottom of your water heater, “insulating” the water from the heat source and reducing efficiency. If you avoid draining your water heater, you might notice a decrease in water pressure and chunks of sediment coming out of your taps.
Article sources
ConsumerAffairs writers primarily rely on government data, industry experts and original research from other reputable publications to inform their work. Specific sources for this article include:
- Whirlpool Water Heaters, “Draining and Flushing Your Water Heater.” Accessed Nov. 9, 2025.
- A. O. Smith, “How to Drain and Flush a Water Heater.” Accessed Nov. 9, 2025.
- Florida PACE Funding Agency, “Comparing Types of Water Heaters.” Accessed Nov. 9, 2025.
