Table 386: Heat Pump Water Heater Fuel Switch Calculation Assumptions Term Unit Values Source , Energy Factor of baseline water None Default: >= 2 1 heater Nameplate EDC Data Gathering , Energy Factor of installed fossil fuel None >=0.67 for Natural Gas and 7, EDC Data water heater* Propane Gathering >=0.495 for Oil , Energy Factor of installed tankless None >=0.82 7 water heater , Fossil Fuel Water Heaters Derating None Storage Water Heaters: 1.0 8 Adjustment factor Tankless Water Heaters: 0.91 Load, Average annual load kBtu Varies 5 , Temperature of hot water °F 119 2 , Temperature of cold water supply °F 55 3 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 Default: See Table 384 HW, Average annual gallons of use Gallons Calculation EDC Data Gathering EDC Data Gathering RDF, Resistive Discount Factor 0.90 6 None , Energy Factor of baseline gas water None 0.594 7 heater, see 3.4.2 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 386: Heat Pump Water Heater Fuel Switch Calculation Assumptions Term Unit Values Source , Energy Factor of baseline water heater None Default: >= 2 1 Nameplate EDC Data Gathering , Energy Factor of installed fossil fuel water heater* None >=0.67 for Natural Gas and Propane >=0.495 for Oil 7, EDC Data Gathering , Energy Factor of installed tankless water heater None >=0.82 7 , Fossil Fuel Water Heaters Derating Adjustment factor None Storage Water Heaters: 1.0 Tankless Water Heaters: 0.91 8 Load, Average annual load kBtu Varies 5 , Temperature of hot water °F 119 2 , Temperature of cold water supply °F 55 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 HW, Average annual gallons of use Gallons Default: See Table 384 Calculation EDC Data Gathering EDC Data Gathering RDF, Resistive Discount Factor None 0.90 6 , Energy Factor of baseline gas water heater, see 3.4.2 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.
1354189.docx