Gas powered water heaters typically have an energy factor between 0 5 and 0 7.
95 energy factor water heater.
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.
What s a good water heater energy factor.
The perfect electric resistance water heater could not exceed an energy factor of 1 0 due to this technology s physical limitations.
One good way to determine whether or not a water heater is energy efficient is to look for the energy star label.
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.
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.
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.
Electric water heaters typically have energy factors between 0 75 and 0 95.
The higher the ef value is the more efficient the water heater.
An older measure of water heater overall efficiency that is being phased out due to new test methods for water heaters.
Effective as of september 1 2010.
Expressed as a decimal the uniform energy factor is determined by running a department of energy specified simulated use test sut.
As of september 1 2010 a water heater needs to have an energy factor of 0 67 or higher in order to qualify.
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.
The energy star water heater with heat pump has an energy factor of 2 5 250 more energy efficient the doe calculator won t take a number above 95 so divide the standard standard electric water heater s annual operating cost by 250 use the key.
The uniform energy factor.
Use the energy factor to determine the energy efficiency of a storage tankless or demand type water heater or heat pump water heater.
The typical energy factor for a gas water heater is between 0 5 and 0 7.
This will give you the annual operating cost for a heat pump water heater.
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.
Smith high efficiency water heaters have been recognized as energy star water heaters.
2016 manufacturer s certification statement high efficiency water heater models.
We are pleased to announce that the following a.
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.
