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Home › Glossary › BTU (British Thermal Unit)

BTU (British Thermal Unit)

A BTU is the amount of heat needed to raise one pound of water by one degree Fahrenheit. Gas water heaters are rated by their burner input in BTUs per hour.

Blue gas burner flame under a water heater tank

Higher BTU input means faster recovery, but it also means more gas demand. Large tankless units can require a bigger gas line, which we verify before install.

See tankless water heaters.

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