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

The first hour rating (FHR) tells you the number of gallons per hour of hot water. Therms relate to the gas consumption of water heater. When you are shopping for 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 water heaters of equal capacity and FHR. More.

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