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Depending on some factors, once a year is a good guideline to drain most water heaters. However, if you live in an area with hard water (high mineral content), it’s better to do it every six months or so.
The idea behind draining a water heater regularly is that removing this sediment can lengthen its lifespan, earning you hot showers for longer. After all, a clean and unclogged water heater doesn’t have to work as hard to keep your water warm!
Ideally, you should turn your water heater off for a few hours before draining the tank. Turning the unit off beforehand allows the water to cool and reduces the risk of scalds. Always wear thick gloves and safety goggles to protect your skin while you drain the water heater.
Follow these steps to drain and flush your electric water heater properly: Locate the drain valve at the bottom of the tank. Attach a garden hose to the drain valve and direct it to a suitable drainage area or bucket.
Water heaters should be drained once every six to 12 months to eliminate sediment in the bottom of the tank. Here's how to drain a water heater the right way.
Unless your operator’s manual suggests a different frequency, the water heater should be drained and flushed once a year. This yearly flushing is a good time to test the pressure relief valve and make sure the overflow drain is clear.
Should you drain your hot water heater every year? Yes, but that’s really just the bare minimum. You should really drain and flush your water heater twice-per-year: once in the spring, and then again in the fall.