The global water heating market was valued at USD 143.1 billion in 2025 and is projected to reach USD 277.2 billion by 2035, representing a 7.5% compound annual growth rate. Growth is being supported by energy-efficiency goals, carbon-reduction efforts, rising energy prices and demand for lower operating costs. Heat pump water heaters, solar-assisted systems, hybrid equipment and smart connected units are gaining traction as households, businesses and industrial operators replace conventional systems. The residential segment accounted for 83.6% of the market in 2025 and is forecast to grow at a 7% CAGR through 2035. The water heater segment is expected to reach USD 76 billion by 2035, while the U.S. market was valued at USD 8.1 billion in 2025. The report covers market trends, regulatory developments, technology and application segments, regional forecasts, competitive dynamics and company strategies through 2035.