Knowing how to drain a hot water heater is one of the most useful maintenance skills a homeowner can have. It sounds intimidating, but with the right preparation and a little patience, most homeowners can handle it themselves. More importantly, doing it regularly can add years to the life of your installed water heater and keep your energy bills from creeping up over time.
Over time, minerals and sediment from your water supply settle at the bottom of your water heater tank. In Georgia, where water mineral content can vary significantly by area, this buildup can happen faster than you might expect. Left alone, sediment creates a layer of insulation between the heating element and the water, forcing your unit to work harder and use more energy to heat the same amount of water.
Regular draining flushes that sediment out before it becomes a problem. Most plumbing professionals recommend draining your tank at least once a year. If you notice any of the following, it may be time to drain sooner:
Learn more about signs your water heater needs to be replaced and how to extend water heater lifespans here: How Long Does a Water Heater Last? Signs It's Time for Replacement
Gathering your supplies ahead of time makes the process go smoothly. Before you begin, have the following on hand:
Safety comes first. If you have an electric water heater, go to your breaker box and switch off the breaker connected to the unit. If you have a gas water heater, locate the thermostat on the unit and turn the setting to "Pilot." This keeps the pilot light going without actively firing the burner. Never attempt to drain a water heater while it is still actively heating.
Find the cold water supply valve at the top of the water heater and turn it off. This stops new water from entering the tank while you drain it. The valve typically turns clockwise to close.
This step is easy to skip, but it matters. Hot water straight from a tank can cause serious burns. If possible, let the water heater sit for several hours or overnight before draining. If you need to drain it sooner, use extra caution and wear work gloves throughout the process.
The drain valve is located near the bottom of the tank and looks similar to a hose bib on the outside of a house. Attach one end of your garden hose securely to the valve and run the other end to a floor drain, outside to a safe area in your yard, or into a large bucket. Keep in mind the water will likely be discolored, so avoid draining onto grass or plants if the sediment buildup is heavy.
Before you open the drain valve, go to a sink or tub inside your home and turn on a hot water faucet. Leave it running. This relieves the pressure in the system and allows the tank to drain freely without creating a vacuum. Without this step, draining will be much slower or may not work at all.
Using a flat-head screwdriver or by hand depending on the valve type, open the drain valve and allow the tank to empty completely. Depending on the size of your tank and the amount of sediment present, this can take anywhere from 20 minutes to an hour. The water will likely appear brown or murky at first. That is the sediment flushing out, which is exactly what you want to see.
Once the tank is empty, briefly turn the cold water supply back on to flush out any remaining sediment. Let it run until the water coming out of the hose runs clear. This final rinse makes a noticeable difference in how clean your tank ends up.
Close the drain valve, disconnect the hose, and turn the cold water supply back on. Allow the tank to fill completely before restoring power or relighting the gas. You will know the tank is full when water flows steadily from the hot water tap you left open inside. Once full, close that tap, restore power or reset the gas setting, and your water heater is ready to go.
Wondering how long it will take your cold water to heat up after restarting? Learn more here: How Long Does a Water Heater Take to Heat Up?
Draining your water heater is manageable for most homeowners, but there are situations where it makes sense to bring in a licensed plumber or HVAC technician:
The team at McCoy HVAC Services has been serving Georgia homeowners for 31 years. Whether you need a water heater inspection, a full flush, or a new installation, we offer free estimates and flexible financing options. Contact us today to schedule your service.rs involve pressurized systems and can be dangerous without the right training and tools.
