Use the eF calculator to determine the energy efficiency and savings an eF Series® water will provide when compared to a conventional model. Simply input the required data into the form to find day and yearly savings for both energy and money.

 

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)/ 100000
Fuel Consumed (Therms/Year)
Energy Consumed (Btu/Year)/ 100000
$ Fuel Cost ($/Day)
Fuel Consumed (Therms/Day) X Cost per Therm ($)
$ Fuel Cost ($/Year)
Fuel Consumed (Therms/Year) X Cost per Therm ($)