Estimating Costs and Efficiency of Storage, Demand, and Explore further
2021-4-5u2002·u2002For gas and oil water heaters. You need to know the unit cost of fuel by Btu (British thermal unit) or therm. (1 therm = 100,000 Btu) 365 days a year X 0.4105 therms/day ÷ EF X Fuel Cost (therm) = estimated annual cost of operation. Example: A natural gas water heater with an EF of .58 and a fuel cost of $0.00000109/therm
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