Water heaters are appliances that heat and store potable water for domestic use in bathing, cleaning, and washing. Primary types include storage tank heaters (gas or electric), tankless (on-demand) heaters, heat pump water heaters, and solar systems. Selection is driven by household size and hot water demand (measured in gallons per minute for tankless, or tank capacity in gallons), energy source availability and cost, and installation space. Proper sizing is critical for meeting demand efficiently. Important considerations are energy efficiency ratings (EF or UEF) and that installation often requires compliance with specific plumbing, electrical, and venting codes.

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