Table : Calculation Assumptions for Heat Pump Water Heater to Fossil Fuel Water Heaters Component Unit Values Source EFHP,bl , Energy Factor of baseline heat pump Fraction Default = 2.0 or EDC 1 water heater Data Gathering EFNG,inst . Energy Factor of installed natural gas Fraction EDC Data Gathering 2 water heater Default: ≤55 Gallons= 0.67 >55 Gallons= 0.77 EFPropane,inst , Energy Factor of installed Fraction EDC Data Gathering 2 propane water heater Default: Gallons= 0.67 ≤55 >55 Gallons= 0.77 EFTankless Water Heater , Energy Factor of Fraction EDC 2 installed tankless water heater Data gathering Default= 0.90 EFOil,inst , Energy Factor of installed oil water Fraction >=0.585 or EDC Data 3 heater Gathering HW , Hot water used per day in gallons 50 4 Thot , Temperature of hot water °F 119 5 Tcold , Temperature of cold water supply °F 55 6 FDerate , COP De-rating factor Fraction Table 259 7, and discussion below , Equivalent Full Load Hours for cooling Table 257 8 , Equivalent Full Load Hours for heating Table 258 8 HSPF , Heating Seasonal Performance Factor EDC Data Gathering 9 Default= 7.4 , Seasonal Energy Efficiency Ratio EDC Data Gathering 9 SEER Default= 12 ETDF, Average Usage per Average Energy 0.00008047 10 Usage Table : Equivalent Full Load Hours for Cooling Season City Allentown 487 Erie 389 Harrisburg 551 Philadelphia 591 Pittsburgh 432 Scranton 417 Williamsport 422
Table : Calculation Assumptions for Heat Pump Water Heater to Fossil Fuel Water Heaters Component Unit Values Source EFHP,bl , Energy Factor of baseline heat pump water heater Fraction Default = 2.0 or EDC Data Gathering 1 EFNG,inst . Energy Factor of installed natural gas water heater Fraction EDC Data Gathering Default: ≤55 Gallons= 0.67 >55 Gallons= 0.77 2 EFPropane,inst , Energy Factor of installed propane water heater Fraction EDC Data Gathering Default: ≤55 Gallons= 0.67 >55 Gallons= 0.77 2 EFTankless Water Heater , Energy Factor of installed tankless water heater Fraction EDC Data gathering Default= 0.90 2 EFOil,inst , Energy Factor of installed oil water heater Fraction >=0.585 or EDC Data Gathering 3 HW , Hot water used per day in gallons 50 4 Thot , Temperature of hot water °F 119 5 Tcold , Temperature of cold water supply °F 55 6 FDerate , COP De-rating factor Fraction Table 259 7, and discussion below , Equivalent Full Load Hours for cooling Table 257 8 , Equivalent Full Load Hours for heating Table 258 8 HSPF , Heating Seasonal Performance Factor EDC Data Gathering Default= 7.4 9 SEER , Seasonal Energy Efficiency Ratio EDC Data Gathering Default= 12 9 ETDF, Average Usage per Average Energy Usage 0.00008047 10 Table : Equivalent Full Load Hours for Cooling Season City Allentown 487 Erie 389 Harrisburg 551 Philadelphia 591 Pittsburgh 432 Scranton 417 Williamsport 422
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