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How are FHR and Therms used to compare the efficiency of hot water heaters?

April 26, 2017compare efficiency fhr Heaters hot therms Used water

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How are FHR and Therms used to compare the efficiency of hot water heaters?

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A. The first hour rating (FHR) tells you the number of gallons per hour of hot water. Therms relates to the gas consumption of a hot water heater. When you’re shopping for a hot water heater, compare the energy factor on the Energy Guide label. FHR and Therms are not sufficient to calculate the energy factor. Also remember to compare hot water heaters of equal capacity and FHR.