Sediment buildup refers to the accumulation of minerals, scale, and rust particles that settle at the bottom of water heater tanks over time. These deposits form when calcium, magnesium, and other minerals precipitate from heated water, creating a layer of solid material that reduces tank efficiency and accelerates corrosion.
Formation and Consequences
Hard water with mineral content above 120 mg/L (measured as calcium carbonate equivalent) creates sediment more rapidly. Sediment buildup reduces heating efficiency by 5-15 percent, increases energy consumption, and creates insulating barriers between the burner or element and water. Thick sediment layers can trap water and cause localized corrosion, potentially leading to tank failure within 5-7 years in severe cases.
Prevention and Management
Annual tank flushing removes sediment effectively, extending tank life to 12-15 years in high-mineral areas. Installing a water softener reduces mineral content and prevents future accumulation. Signs include popping/rumbling sounds, discolored hot water, and slower heating recovery. Professional flushing costs $150-$300 annually but prevents costly premature tank replacement.