An efficiency rating of gas- or oil-fired storage tank-type or tankless water heaters, where energy supplied as hot water is divided by the total amount of energy used by the water heater over a 24 hour period taking into account standby loss, cycling and recovery efficiency. The higher the EF, the more efficient the water heater. ENERGY STAR® – ENERGY STAR is an international symbol for energy efficiency – a simple way for consumers to identify products that are among the top energy performers on the market. ENERGY STAR qualified products help save energy and money, and protect the environment. To qualify for the ENERGY STAR symbol, products must meet stringent specifications for energy consumption without sacrificing the features, versatility and quality expected of high-performing products.
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