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Water heater uef rating. Ef is determined by the department of energys test method outlined in the 10 cfr parts 200 to 499 edition revised as of january 1 2014. When compared to standard products of the same fuel type a water heater with a higher uniform energy factor rating uses less energy resulting in both energy and monetary savings. The delivery capacity for storage water heaters is rated by first hour rating or fhr..
However your storage options increase with a tankless water heater since the heaters are compact. Efficiency standards for gas and electric water heaters are different but both use the uniform energy factor uef ratings system where higher scoring units produce more hot water while using less energy. Uefs are determined. Water heater uef rating.
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