Table : Heat Pump Water Heater Calculation Assumptions Component Type Values Source EFbase, Energy Factor of baseline water heater Variable See Table 392 1 EFproposed, Energy Factor of proposed efficient Variable Default: 2.2 Program Design water heater Nameplate EDC Data Gathering Load, Average annual Load in kBTU Fixed Varies 5 Thot, Temperature of hot water Fixed 123 °F 2 Tcold, Temperature of cold water supply Fixed 55 °F 3 EnergyToDemandFactor Fixed 0.000178 4 FAdjust, COP Adjustment factor Fixed 0.80 if outdoor 4 1.09 if indoor 1.30 if in kitchen ResistiveDiscountFactor Fixed 0.90 6 HW, Average annual gallons of Use Variable Default: See Calculation Table 389 EDC Data EDC Data Gathering Gathering EFNG, base, Energy Factor of baseline gas water Fixed 0.594 7 heater Energy Factors based on Tank Size Federal Standards for Energy Factors are equal to 0.97 -0.00132 x Rated Storage in Gallons. 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 Sources: Federal Standards are 0.97 -0.00132 x Rated Storage in Gallons. For a 50-gallon tank this is approximately 0.90. Conservation Program: Energy Conservation “Energy
Table : Heat Pump Water Heater Calculation Assumptions Component Type Values Source EFbase, Energy Factor of baseline water heater Variable See Table 392 1 EFproposed, Energy Factor of proposed efficient water heater Variable Default: 2.2 Program Design Nameplate EDC Data Gathering Load, Average annual Load in kBTU Fixed Varies 5 Thot, Temperature of hot water Fixed 123 °F 2 Tcold, Temperature of cold water supply Fixed 55 °F 3 EnergyToDemandFactor Fixed 0.000178 4 FAdjust, COP Adjustment factor Fixed 0.80 if outdoor 1.09 if indoor 1.30 if in kitchen 4 ResistiveDiscountFactor Fixed 0.90 6 HW, Average annual gallons of Use Variable Default: See Table 389 Calculation EDC Data Gathering EDC Data Gathering EFNG, base, Energy Factor of baseline gas water heater Fixed 0.594 7 Energy Factors based on Tank Size Federal Standards for Energy Factors are equal to 0.97 -0.00132 x Rated Storage in Gallons. 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 Sources: Federal Standards are 0.97 -0.00132 x Rated Storage in Gallons. For a 50-gallon tank this is approximately 0.90. “Energy Conservation Program: Energy Conservation
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