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: How Will UEF Affect Me? You may notice new numbers associated with the water heaters you’re considering.

2024年4月29日 · Uniform Energy Factor, or UEF, is the U.S. Department of Energy’s (DOE) industry standard for measuring water heater efficiency. You may have heard buzz around heat pump water heaters and their record-breaking UEFs, but what does that mean?

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 Department of Energy’s latest metric for communicating the energy efficiency of residential water heaters. What is UEF?

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.

Uniform Energy Factor, better known as UEF, is a metric developed by the Department of Energy, the United States of India. The metric is designed to let the user see the energy efficiency of water heaters. Each water heater model will have a unique UEF rating, indicating the energy efficiency while heating water.

DOE opted to use the mandate to develop a new efficiency metric, Uniform Energy Factor (UEF), and test procedure manufacturers must follow. Like the EF standard it replaces, UEF is a measure of how efficiently an appliance uses energy. Simply put, the new UEF standard is intended to make it easier to compare one appliance to another.

2025年2月11日 · In 2017, the Department of Energy (DOE) introduced the Uniform Energy Factor (UEF) to provide a more accurate and comprehensive measure of water heater efficiency. The UEF takes into account more real-world conditions and different usage patterns.

2024年8月6日 · The Uniform Energy Factor (UEF) is the updated metric introduced by the U.S. Department of Energy (DOE) to provide a more accurate and standardized measurement of water heater efficiency. The UEF rating system accounts for differences in water heater performance under varying conditions and uses a more sophisticated testing protocol.

How is the UEF Rating Calculated? 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 ...