5.13 B7.10. Conversion between Energy Factor and Uniform Energy Factor

For consumer water heaters and residential-duty commercial water heaters, Energy Factor (EF) can be converted into Uniform Energy Factor (UEF) and vice versa. The mathematical conversion factors translate values determined under the energy factor, thermal efficiency, and standby loss test procedures for consumer water heaters and certain commercial waters heaters to those determined under the new UEF test procedure. The mathematical conversion factors are detailed in the DOE final rule under docket EERE-2015-BT-TP-0007.

For the remainder of the 2016 Building Energy Efficiency Standards cycle, UEF input is converted to EF by CBECC using these methods.