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eF SERIES
®
CALCULATOR
Calculation Specifications
Number of water heaters installed
Cost per Therm ($)
Nominal Hours of Operation Per Day
Days of Operation Per Year
CALCULATE
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)]
$
CALCULATE
Conventional Water Heater
Specifications:
Total Input (Btu/hr)
Water Heater Efficiency (%)
CALCULATE
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 ($/Year)
Fuel Consumed (Therms/Year) X Cost per Therm ($)
$
CALCULATE
eF Series® Water Heater
Specifications:
EF-60T-125E-3N(A)
EF-60T-150E-3N(A)
EF-60T-199E-3N(A)
EF-100T-150E-3N(A)
EF-100T-199E-3N(A)
EF-100T-250E-3N(A)
EF-100T-300E-3N(A)
EF-100T-399E-3N(A)
EF120T4003N
EF120T5003N
Total Input (Btu/hr)
Water Heater Efficiency (%)
CALCULATE
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 ($/Year)
Fuel Consumed (Therms/Year) X Cost per Therm ($)
$
CALCULATE
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