What does AFUE measure?

AFUE, or Annual Fuel Utilization Efficiency, measures the efficiency of heating appliances, specifically how effectively they convert fuel into heat over a heating season. The AFUE rating is expressed as a percentage and indicates the ratio of useful heating output to the total energy consumed, which helps consumers understand how much fuel is being efficiently used for heating purposes.

This concept is crucial for both environmental considerations and cost savings, as a higher AFUE rating signifies a more efficient furnace or boiler that uses less fuel to produce the same amount of heat. The measurement is particularly relevant for residential heating systems, which are typically used during colder months. Understanding AFUE is important for making informed decisions when selecting heating equipment and for evaluating its performance over time.