Table : Heat Pump Water Heater Calculation Assumptions Term Unit Values Source , Energy Factor of baseline water heater None See Table 374 1 , Energy Factor of proposed efficient water None Default: 2.2 Program Design heater Nameplate EDC Data Gathering Load, Average annual Load kBTU Varies 5 , Temperature of hot water Degrees 119 °F 2 Fahrenheit , Temperature of cold water supply Degrees 55 °F 3 Fahrenheit ETDF, Energy to Demand Factor None 0.000178 4 ,COP Adjustment factor None 0.80 if outdoor 4 1.09 if indoor 1.30 if in kitchen RDF, Resistive Discount Factor None 0.90 6 HW, Average annual gallons of use Gallons Default: See Table Calculation 371 EDC Data EDC Data Gathering Gathering , Energy Factor of baseline gas water None 0.594 7 heater Energy Factors based on Tank Size Federal Standards for Energy Factors are equal to . The following table shows the Energy Factors for various tank sizes. Table : Minimum Baseline Energy Factor Based on Tank Size Tank Size (gallons) Minimum Energy Factors (Ebase) 40 0.9172 50 0.9040 65 0.8842 80 0.8644 120 0.8116
Table : Heat Pump Water Heater Calculation Assumptions Term Unit Values Source , Energy Factor of baseline water heater None See Table 374 1 , Energy Factor of proposed efficient water heater None Default: 2.2 Program Design Nameplate EDC Data Gathering Load, Average annual Load kBTU Varies 5 , Temperature of hot water Degrees Fahrenheit 119 °F 2 , Temperature of cold water supply Degrees Fahrenheit 55 °F 3 ETDF, Energy to Demand Factor None 0.000178 4 ,COP Adjustment factor None 0.80 if outdoor 1.09 if indoor 1.30 if in kitchen 4 RDF, Resistive Discount Factor None 0.90 6 HW, Average annual gallons of use Gallons Default: See Table 371 Calculation EDC Data Gathering EDC Data Gathering , Energy Factor of baseline gas water heater None 0.594 7 Energy Factors based on Tank Size Federal Standards for Energy Factors are equal to . The following table shows the Energy Factors for various tank sizes. Table : Minimum Baseline Energy Factor Based on Tank Size Tank Size (gallons) Minimum Energy Factors (Ebase) 40 0.9172 50 0.9040 65 0.8842 80 0.8644 120 0.8116
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