Water Heater Energy Factor Vs Efficiency

The two figures are related but different.

Water heater energy factor vs efficiency.

Use the energy factor to determine the energy efficiency of a storage tankless or demand type water heater or heat pump water heater. 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. On the contrary thermal efficiency is the amount of energy delivered as heated water compared to the energy consumption of the water heater. That means that 58 60 of the energy that is being used to heat your water is effectively converted into heat.

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. The new uef rating method improves the industry s ability to. The fuel used by a water heating system will not only affect annual operation costs but also the water heater s size and energy efficiency. Simplify the water heater selection.

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 following is a list of water heater options by fuel or energy source. An older measure of water heater overall efficiency that is being phased out due to new test methods for water heaters. That means that 58 60 of the energy that is being used to heat your water is effectively converted into heat.

The term is used by the united states department of energy to develop and enforce minimum energy conservation standards under. The greater the energy factor the more efficient the appliance is. Energy factor calculates the amount of energy delivered as hot water compared to the energy consumption of a residential water heater over a 24 hour period. The uniform energy factor.

Define consistent standards for measuring energy efficiency performance. Most new water heaters have an efficiency factor ef of 58 60. 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. Exploring water heater options by fuel type.

Expressed as a decimal the uniform energy factor is determined by running a department of energy specified simulated use test sut. The higher the ef value is the more efficient the water heater. Fuel type and its availability in your area may narrow your water heater choices. 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.

Energy factor is a measure of efficiency for a variety of appliances including water heaters.