How To Drain Water Heater

Turn off the water heater

Turn the thermostat to “pilot” (gas) or turn off the power at the breaker box (electric).

Please note that Electric water heaters should be turned entirely off during flushing. If the tankless water heaters level drops below the temperature of the heating elements, the heaters can quickly burn out; most water heaters use a large, insulated tank. The tank’s bottom can become clogged with naturally occurring minerals and sand from municipal water lines. The sediment buildup could reduce the heater’s efficiency and capacity. This sediment can block drains and cause problems with maintenance. It is easy to drain a water heater to get rid of sediments.

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1. Hot Water Tap

Electric water heaters can be wired to their circuit breaker. Locate the breaker switch for the water heater in the main electrical panel.

The hot water tap should be located near the water heater. This reduces the pressure in the system and allows the water to drain quickly. It’s similar to removing your finger from the top of a drinking straw.

2. Open Drain Valve

Turn on the drain valve to allow the water from the tank to drain. The water will still be hot so take care. After all the water has been drained, turn off the cold water supply. This will activate any sediment.

Continue this process until the water runs clear. Dave Moody has seen severe cases of sediment buildup: “In some instances, sediment might block the drain valve opening, restricting the flow of water. It is best to contact an expert if this happens.

4. Close Valve, Refill Tank, and Restart Water Heater

Turn off the cold water supply, close the drain valve and remove the hose. The tank will start to fill. Turn on the hot water tap that you opened earlier. Turn the water off once cold water starts to flow from it. Turn the gas valve from the pilot position on the control panel or plug the tank with electricity. Make sure you check the valve opening after it is closed To ensure that there are no water leaks.


Caution: Some tanks need to be complete to prevent damage to the gas burners or heating elements. Follow all instructions and warnings given by the manufacturer for your water heater.

Call a Boston MA plumber to drain the water heater. Or, you can do it yourself by following these easy instructions.

A Boston water heater can be drained occasionally to prolong its life. Water heaters heat water and provide hot water to your home. Minerals and other sediments can settle on the heater’s bottom while it heats the water. This could cause damage to the heater. It is essential to drain and flush your water heater at least once per year.

The plumbing drain valve is located at the bottom of the water tank. Attach the garden hose at one end to the valve. The other end of your house’s garden hose should be connected to the valve. The other end of the hose should be inserted into a drain (e.g., a nearby toilet or sink). This is where water drains out.
The drain valve is where you have just attached your hose. The water’s color will change. It will initially appear dark and rusty due to the sediment. The water flowing will become clear after a few gallons have been drained.
Turn off the heater’s heating Turn off the circuit breaker if it is an electric heater. Turn the thermostat to “pilot” if it is a gas heater.
Turn off the water supply. The shutoff valve is likely to be on the copper pipe that runs through the tank’s top.
When you see clear water, close the drain valve. If you live with hard water, sediment can quickly build up and clog your heater’s drain valve.
After the house’s hot water tank is full, turn the power back on or the gas supply.

24/7 Emergency Service Available |
TOLL-FREE:  (800) 942-8555 | LOCAL: (978) 352-7900

CategoryWater Heater

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