Ef Rating 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.

Ef rating water heater.

The fhr is measured at a 135 f outlet temperature in the energy factor test method and at a 125 f outlet. The unit has an ef of 0 93 for natural gas or propane up to 94 percent thermal efficiency and an energy star rating. This is perfect for mid to large sized households. 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 new uef rating method improves the industry s ability to. Define consistent standards for measuring energy efficiency performance. The higher the ef value is the more efficient the water heater. The rinnai ru98ip is an outdoor gas powered tankless water heater.

Epa criteria for electric tank water heaters. Energy factor ef is a measurement that s used to describe the energy efficiency of a water heater. The manufacturer s warranty must cover the unit for at least 6 six years or more on sealed systems. An estimate of the maximum volume of hot water in gallons that a storage water heater can supply within an hour that begins with the water heater fully heated.

This includes the following. Use the energy factor to determine the energy efficiency of a storage tankless or demand type water heater or heat pump water heater. First hour rating fhr. It also has a maximum btu of 199 000 and can produce 9 8 gallons per minute.

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. The fhr must be at least 50 gallons per hour or more. More accurately reflect real world scenarios that impact energy efficiency ratings.