Water Heater Energy Factor List

Define consistent standards for measuring energy efficiency performance.

Water heater energy factor list.

You need to know or convert the unit cost of electricity by kilowatt hour kwh. Simplify the water heater selection. The new uef rating method improves the industry s ability to. 365 days year x 12 03 kwh day ef x fuel cost kwh annual cost of operation.

Ef is determined by the department of energy s test method outlined in the 10 cfr parts 200 to 499 edition revised as of january 1 2014. 365 x 12 03 2 0 x 0 0842 185. An older measure of water heater overall efficiency that is being phased out due to new test methods for water heaters. Expressed as a decimal the uniform energy factor is determined by running a department of energy specified simulated use test sut.

The typical energy factor for a gas water heater is between 0 5 and 0 7. The higher the ef value is the more efficient the water heater. A heat pump water heater with an ef of 2 0 and an electricity cost of 0 0842 kwh. 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.

It s important to note that energy factors can vary significantly depending on their fuel source. This means that between 75 and 95 percent of the energy used to heat the water ends up being delivered to your taps as usable hot water. For gas condensing water heaters the energy factor must be 0 8 or higher to qualify for the energy star label. The uniform energy factor.