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Similarly one may ask, what is uniform energy factor?

Uniform Energy Factor (UEF) is a new metric for determining the energy efficiency 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 to remember – the higher the UEF, the higher the efficiency and the lower the energy bill.

Also, what does energy factor mean? A water heater's energy factor (EF) is a measure of useful energy coming out of the water heater, divided by the amount of energy going in. The energy factor is based on the amount of hot water produced per unit of fuel consumed per day. Electric water heaters typically have energy factors between 0.75 and 0.95.

Also question is, is a higher or lower energy factor better?

The higher the energy factor, the better. By varying the tank insulation, burner design, and a few other features, manufacturers continue to make residential heaters more energy efficient. However, higher energy factor values don't always mean lower annual operating costs, especially when you compare fuel sources.

What is uniform energy factor for water heaters?

The Uniform Energy Factor for residential and certain commercial water heaters refers to its efficiency when run under standardized conditions for a 24-hour period. Expressed as a decimal, the Uniform Energy Factor is determined by running a Department of Energy specified simulated use test (SUT).