What is standard AFUE?

What is standard AFUE?

WHAT IS A GOOD AFUE? A higher AFUE rating means greater energy efficiency. The minimum standard AFUE for new furnaces is 78 percent. A mid-efficiency furnace usually has an AFUE rating between 80 and 85 percent, while a high-efficiency unit has a rating between 90 and 97 percent.

Where can I find a furnace AFUE?

1) Find your current furnace AFUE rating – The rating should be on your furnace’s faceplate. If it’s not, then look for the model or serial number of the furnace, which should be on the furnace or on the compressor outside. Use that model or serial number on the manufacturer’s website to find the furnace’s AFUE rating.

What is a furnace AFUE rating?

Annualized Fuel Utilization Efficiency (AFUE) Furnaces are rated by the Annual Fuel Utilization Efficiency (AFUE) ratio, which is the percent of heat produced for every dollar of fuel consumed. Like the miles-per-gallon rating on your automobile, the higher the AFUE rating, the lower your fuel costs.

Is 80% AFUE High-efficiency?

An 80% AFUE for a gas furnace, for example, means the furnace outputs 80 BTUs of useful heat for every 100 BTUs of natural gas it burns. The remainder may be wasted heat in the exhaust. Furnaces with 90% or higher AFUE are considered high-efficiency in the HVAC industry.

What is 90% AFUE?

AFUE (Annual Fuel Utilization Efficiency) is a type of percent rating that indicates how much of the heat goes toward heating your home and how much is wasted. If the rating is 90%, then 90% goes toward heating your home and 10% is wasted.

How is AFUE calculated?

The AFUE percentage is calculated by dividing the amount of fuel supplied to the heater by the amount of heat produced by the unit (usually in Btu). The higher the AFUE rating, the lower your fuel costs. AFUE is used to display the energy of many types of combustion appliances, including: Furnaces.

Why do gas furnace efficiencies jump from 80% to 90%?

Why do gas furnace efficiencies jump from 80% to 90%? Efficiencies over 80% cause condensation but the flue gas is still too hot for PVC vent pipe until the efficiency reaches 90%.

What type of furnaces are high efficiency with AFUE ratings above 90 %?

AFUE represents the percentage of fuel consumed by a furnace that actually contributes to useable heat versus the amount lost in the combustion process. A standard efficiency furnace has an AFUE of 80 percent or less, while condensing furnaces with an AFUE of 90 percent or above are considered high-efficiency models.

How much fuel does an 80 AFUE furnace burn?

80 AFUE rating furnace produces 792,960,000 J burning $9,12 of fuel. 94 AFUE rating furnace produces 958,348,800 J burning $9,12 of fuel. For an average home and an average heating season, here are the total 1-year costs of running a gas furnace: 80 AFUE furnace will burn through $1,213.37 worth of natural gas.

Which is the best AFUE modulating boiler system?

System 2000 significantly outperforms the 95 AFUE modulating condensing boiler and al other systems tested from around the globe. Our unique purge control strategy, low mass design, and high performance water heating system results in the top rating, and virtually eliminates the effects of oversizing.

Is the AFUE for a hot water boiler accurate?

U.S. Department of Energy lab results 1: AFUE is inaccurate, especially for boilers that make hot water. This chart shows types of boilers and annual efficiency from a Department of Energy laboratory study to help identify better performing heating systems.

Is the flue loss of a furnace included in AFUE?

AFUE doesn’t include the heat losses of the duct system or piping, which can be as much as 35% of the energy for output of the furnace when ducts are located in the attic, garage, or other partially conditioned or unconditioned space. An all-electric furnace or boiler has no flue loss through a chimney.