Beginning, June 12, 2017, EF ratings will be replaced with the new industry standard for measuring energy efficiency in water heaters called, Uniform Energy Factor (UEF). The new UEF rating method improves the industry’s ability to:

2024年4月29日 · UEF provides a consistent standard, simplifies the selection process, and more accurately measures energy usage under real-world conditions compared to previous measurement models. A UEF can be considered a ratio that measures how much of the energy a water heater uses is translated directly into heating water rather than wasted by heating the ...

Uniform Energy Factor (UEF): The newest measure of water heater overall efficiency. The higher the UEF value is, the more efficient the water heater. UEF is determined by the Department of Energy’s test method outlined in 10 CFR Part 430, Subpart B, Appendix E.

The Uniform Energy Factor (UEF) is the DOE’s latest metric for communicating the energy efficiency of residential water heaters. Previously, you may have seen efficiency measured by Energy Factor (EF); however, in June 2017, the DOE changed the test procedures and metric used to communicate the energy efficiency of residential water heaters ...

A water heater's energy efficiency is determined by the uniform energy factor (UEF), which is based on how much energy the water heater uses and how much energy is used to power the water heater itself. The higher the uniform energy factor, the more efficient the water heater.

The Uniform Energy Factor Chart is subject to change without notice in accordance with our policy of continuous improvement. The ratings documented on this chart are also listed at www.ahrinet.org and www.energystar.gov .

Uniform Energy Factor (UEF) is a new metric for determining the energy efficiency of a water heater. UEF’s are determined by the estimated usage of a water heater: When selecting the most efficient unit for you, consider the fuel type and the capacity needs for your home. It’s important

These tables list the minimum uniform energy factors required by federal regulations for some of the most common types and sizes of water heaters. Can’t fnd your water heater type or volume?

UEF ratings are determined by assigning water heaters into one of four categories of hot water based on their usage and then evaluating their performance based on that usage. Each category has a specific hot water draw pattern and a water heater is assigned a category based the hot water delivery capacity. A greater UEF rating will

UEF ratings categorize water heaters into four bins based on different levels of hot water usage and evaluate their performance accordingly. A water heater's UEF within its bin is determined based on its first-hour rating. A higher UEF indicates greater energy efficiency and lower operating costs compared to other water heaters in the same bin.