How often should you flush your water heater?

Once a year.

How to do it

Turn off the power or gas, attach a hose to the drain valve, and drain a few gallons until the water runs clear. Tankless heaters need a descaling flush instead.

Why it matters

Sediment on the bottom of the tank wastes energy and wears the tank out early.

Recommended interval: once a year, per A. O. Smith.

General guidance for a typical home; the manufacturer's instructions come first.