Figure : Energy to Demand Factors for Four Commercial Building Types The parameters in the above equation are listed in Table 377. Table : Commercial Water Heater Fuel Switch Calculation Assumptions Term Unit Values Source , Energy Factor of baseline water None Default: See Table 378 1 heater Nameplate EDC Data Gathering , Energy Factor of installed fossil fuel None Default for Natural Gas and 1, 5 water heater* Propane: Gallons = 0.67, ≤55 >55 Gallons = 0.77 Default for Oil: >=0.585 Nameplate EDC Data Gathering , Energy Factor of installed tankless None Default: >=0.90 5 water heater Nameplate EDC Data Gathering , Fossil fuel water heaters derating None Storage Water Heaters: 1.0 7 adjustment factor Tankless Water Heaters: 0.91 , Average annual load kBtu Default: See Table 369 DEER Database , Temperature of hot water °F 119 2 , Temperature of cold water supply °F 55 3 , Average annual gallons of use Gallons Default: See Table 369 Calculation EDC Data Gathering EDC Data Gathering ETDF, Energy To Demand Factor None 0.000178 4 RDF, Resistive Discount Factor None 1.0 6 Energy Factors based on Tank Size As of 4/16/2015, Federal Standards for electric water heater Energy Factors are equal to for tanks gallons and gallons. For tanks >55 gallons and gallons, the minimum Energy ≥20 ≤55 ≤120 Factor is . The following table shows the Energy Factors for various tank sizes.
Figure : Energy to Demand Factors for Four Commercial Building Types The parameters in the above equation are listed in Table 377. Table : Commercial Water Heater Fuel Switch Calculation Assumptions Term Unit Values Source , Energy Factor of baseline water heater None Default: See Table 378 1 Nameplate EDC Data Gathering , Energy Factor of installed fossil fuel water heater* None Default for Natural Gas and Propane: ≤55 Gallons = 0.67, >55 Gallons = 0.77 Default for Oil: >=0.585 1, 5 Nameplate EDC Data Gathering , Energy Factor of installed tankless water heater None Default: >=0.90 5 Nameplate EDC Data Gathering , Fossil fuel water heaters derating adjustment factor None Storage Water Heaters: 1.0 Tankless Water Heaters: 0.91 7 , Average annual load kBtu Default: See Table 369 DEER Database , Temperature of hot water °F 119 2 , Temperature of cold water supply °F 55 3 , Average annual gallons of use Gallons Default: See Table 369 Calculation EDC Data Gathering EDC Data Gathering ETDF, Energy To Demand Factor None 0.000178 4 RDF, Resistive Discount Factor None 1.0 6 Energy Factors based on Tank Size As of 4/16/2015, Federal Standards for electric water heater Energy Factors are equal to for tanks ≥20 gallons and ≤55 gallons. For tanks >55 gallons and ≤120 gallons, the minimum Energy Factor is . The following table shows the Energy Factors for various tank sizes.
1350348.docx