eF Series^® Calculator

Compare the benefits of installing eF Series^® water heaters vs. conventional water heaters.

Calculation Specifications

Number of water heaters installed

Cost per Therm ($)

Nominal Hours of Operation Per Day

Days of Operation Per Year

eF Series® Savings:

Hours Per Day Less Run Time [Hours of Operation - EF Hours of Operation Per Day]

Therms Per Day Savings: [Conv. Fuel Consumed (Day) - EF Fuel Consumed (Day)]

Therms Per Year Savings [Conv. Fuel Consumed (Yr) - EF Fuel Consumed (Yr)]

Cost Per Day Savings [Conv. Fuel Cost (Day) - EF Fuel Cost (Day)]

Annual Cost Savings [Conv. Fuel Cost (Yr) - EF Fuel Cost (Yr)]

Conventional Water Heater

Specifications:

Total Input (Btu/hr)

Water Heater Efficiency (%)

Costs:

Nominal Hours of Operation Per
Day

Energy Consumed (Btu/Day) Number of Units X Hours of Operation X BTU/hr

Energy Consumed (Btu/Year) Energy Consumed (Btu/Day) X Days of Operation

Fuel Consumed (Therms/Day) Energy Consumed (Btu/Day)/ 100000

Fuel Consumed (Therms/Year) Energy Consumed (Btu/Year)/ 100000

Fuel Cost ($/Day) Fuel Consumed (Therms/Day) X Cost per Therm ($)

Fuel Cost ($/Year) Fuel Consumed (Therms/Year) X Cost per Therm ($)

eF Series® Water Heater

Specifications:

Total Input (Btu/hr)

Water Heater Efficiency (%)

Costs:

Adjusted eF Hours of Operation Per Day (Hours of Operation) X (Conv. Water Heater Efficiency) (EF series Water Heater Efficiency)

Energy Consumed (Btu/Day) Number of Units X Hours of Operation X BTU/hr

Energy Consumed (Btu/Year) Energy Consumed (Btu/Day) X Days of Operation

Fuel Consumed (Therms/Day) Energy Consumed (Btu/Day)/ 100000Energy Consumed (Btu/Day) X Days of Operation

Fuel Consumed (Therms/Year) Energy Consumed (Btu/Year)/ 100000

Fuel Cost ($/Day) Fuel Consumed (Therms/Day) X Cost per Therm ($)

Fuel Cost ($/Year) Fuel Consumed (Therms/Year) X Cost per Therm ($)

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eF Series® Calculator

Calculation Specifications

eF Series® Savings:

Conventional Water Heater

Specifications:

Costs:

eF Series® Water Heater

Specifications:

Costs:

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ef Calculator

eF Series^® Calculator