The Commission proposed clarification of the variable for the percentage of homes with electric water heating (ELEC) by specifying the implied default as and further adding the EDC data gathering options as and “Unknown” “Electric” “Fossil For clarity, a new would be added to the Default Savings Fuel.” column, titled “ELEC,” Table in order to provide the variable values for the default savings calculations. Additionally, the table would be expanded to provide default savings values for a case in which the water heater fuel is known to be electric and the ELEC equals 100%. This variable clarification and default savings table expansion were proposed for the Low Flow Showerheads and Thermostatic Shower Restriction Valve protocols, as well. a. Comments The Joint Commentators suggest that the electric savings accommodate homes with a HPWH, which would provide fewer savings than a standard electric. Additionally, they suggest that the water heater Energy Factor (EF) be used instead of Recovery Efficiency (RE). These comments were made for Sections 2.3.8, 2.3.9 and 2.3.10. b. Disposition The Commission agrees that HPWHs should be able to be included in the savings analysis of these measures and has added the option to use a RE of 2.1 for homes with a HPWH. The default will remain 0.98 (standard electric) since the 2014 Residential Baseline Study showed that less than 1% of electric water heaters are HPWHs. The Commission rejects the suggestion that EF be used instead of RE for calculating the savings. These measures calculate the energy saved through using less hot water due to the installation of retrofit accessories. As such, they do not affect the standby energy usage of the water heater, but rather the volume of water that is heated from the input temperature to the output temperature. EF has standby losses incorporated into it, whereas RE does not.
The Commission proposed clarification of the variable for the percentage of homes with electric water heating (ELEC) by specifying the implied default as “Unknown” and further adding the EDC data gathering options as “Electric” and “Fossil Fuel.” For clarity, a new column, titled “ELEC,” would be added to the Default Savings Table in order to provide the variable values for the default savings calculations. Additionally, the table would be expanded to provide default savings values for a case in which the water heater fuel is known to be electric and the ELEC equals 100%. This variable clarification and default savings table expansion were proposed for the Low Flow Showerheads and Thermostatic Shower Restriction Valve protocols, as well. a. Comments The Joint Commentators suggest that the electric savings accommodate homes with a HPWH, which would provide fewer savings than a standard electric. Additionally, they suggest that the water heater Energy Factor (EF) be used instead of Recovery Efficiency (RE). These comments were made for Sections 2.3.8, 2.3.9 and 2.3.10. b. Disposition The Commission agrees that HPWHs should be able to be included in the savings analysis of these measures and has added the option to use a RE of 2.1 for homes with a HPWH. The default will remain 0.98 (standard electric) since the 2014 Residential Baseline Study showed that less than 1% of electric water heaters are HPWHs. The Commission rejects the suggestion that EF be used instead of RE for calculating the savings. These measures calculate the energy saved through using less hot water due to the installation of retrofit accessories. As such, they do not affect the standby energy usage of the water heater, but rather the volume of water that is heated from the input temperature to the output temperature. EF has standby losses incorporated into it, whereas RE does not.
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