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The U.S. Department of Energy (DOE) has issued a pre-publication Federal Register final rule pertaining to energy conservation standards for gas-fired instantaneous water heaters. The Energy Policy and Conservation Act (EPCA), prescribes standards for various consumer products and certain commercial and industrial equipment, including gas-fired instantaneous water heaters, which are a type of consumer water heater. In this final rule, DOE is adopting amended standards for gas-fired instantaneous water heaters. DOE has determined that the amended standards for these products would result in significant conservation of energy and are technologically feasible and economically justified.