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Once completed, this rulemaking will fulfill DOE’s statutory obligation to either propose amended energy conservation standards for commercial water heaters, hot water supply boilers, and unfired hot water storage tanks or determine that the existing standards do not need to be amended. DOE must determine whether national standards more stringent than those that are currently in place would result in a significant additional amount of additional energy savings and whether such amended national standards would be technologically feasible and economically justified.