Uniform Energy Factor (UEF) is the DOE’s measure of water heater efficiency. <li data-leveltext="" data-font="Symbol" data-listid="36" data-list-defn-props="{"335552541":1,"335559685":720,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"multilevel"}" aria-setsize="-1" data-aria-posinset="1" data-aria-level="1"> Higher = better. A UEF of 3.40 means the unit produces 3.4 units of hot water energy for every 1 unit of electricity it uses.

What’s UEF?

Uniform Energy Factor (UEF) is the DOE’s measure of water heater efficiency.

Higher = better. A UEF of 3.40 means the unit produces 3.4 units of hot water energy for every 1 unit of electricity it uses.

Site Admin2025-07-07T09:22:50-04:00July 7, 2025|Heat Pumps|