A water heater flush is a maintenance procedure that drains and removes sediment, minerals, and rust particles accumulated inside the tank. This process involves draining the tank completely, introducing fresh water, and agitating or circulating water through the tank multiple times to dislodge and expel buildup.
Procedure and Frequency
Standard flushing takes 30-60 minutes and should occur annually in areas with water hardness exceeding 100 mg/L, or every 2-3 years in soft water regions. The process requires shutting off power/gas, closing the cold water inlet valve, attaching a hose to the drain valve, and opening hot water taps. Some technicians use pumps to reverse-flush the tank for deeper cleaning.
Benefits and Professional Service
Regular flushing extends tank life by 3-5 years, improves heating efficiency by 5-15 percent, restores water temperature consistency, and eliminates rumbling noises. Professional flushes typically cost $150-$300, while DIY flushing requires caution regarding hot water and pressure relief valve operation. Hard water areas with mineral content above 200 mg/L may benefit from semi-annual flushing or water softener installation.