95 Energy Factor Water Heater

The energy factor ef indicates a water heater s overall energy efficiency based on the amount of hot water produced per unit of fuel consumed over a typical day.

95 energy factor water heater.

Smith high efficiency water heaters have been recognized as energy star water heaters. These are ideal hot water solutions for the homeowner looking to go green and save green. 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. As of september 1 2010 a water heater needs to have an energy factor of 0 67 or higher in order to qualify.

This will give you the annual operating cost for a heat pump water heater. The typical energy factor for a gas water heater is between 0 5 and 0 7. Expressed as a decimal the uniform energy factor is determined by running a department of energy specified simulated use test sut. 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.

We are pleased to announce that the following a. What s a good water heater energy factor. 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. The perfect electric resistance water heater could not exceed an energy factor of 1 0 due to this technology s physical limitations.

An older measure of water heater overall efficiency that is being phased out due to new test methods for water heaters. One good way to determine whether or not a water heater is energy efficient is to look for the energy star label. Based on the bin in which a water heater is categorized a pre determined amount of hot water usage is applied to that water heater to determine the annual cost of operation. Due to inconsistent unreliable interpretations of high efficiency ef ratings across national brands all water heating manufactururers are now required to comply with the new doe testing procedures and rating standards.

Electric water heaters typically have energy factors between 0 75 and 0 95. The uniform energy factor. For example a high bin water heater with a uef of 0 95 does not perform exactly the same as that of a low bin water heater with a uef of 0 95. Gas powered water heaters typically have an energy factor between 0 5 and 0 7.

The higher the ef value is the more efficient the water heater. The best electric resistance storage water heaters achieve an energy factor of 0 95 and the best electric resistance tankless water heaters achieve an energy factor of 0 99. Use the energy factor to determine the energy efficiency of a storage tankless or demand type water heater or heat pump water heater. Effective as of september 1 2010.