What is the formula for the efficiency of a heating system?

The formula for the efficiency of a heating system is determined by comparing the amount of useful heat energy produced by the system (Output Energy) to the amount of energy consumed to produce that heat (Input Energy). This relationship is expressed as a percent to illustrate how effectively the system converts input energy into useful output energy.

Efficiency is calculated using the formula:

Efficiency = (Output Energy / Input Energy) × 100%

This means that the higher the ratio of output energy to input energy, the more efficient the heating system is. A system that converts a large portion of the energy it consumes into useful heating energy has a high efficiency rating, indicating good performance.

In contrast, other formulations provided in the question do not accurately reflect how efficiency is typically calculated in HVAC systems. They might mix up the placement of output and input, leading to incorrect interpretations of the system's effectiveness. Understanding this specific calculation helps HVAC professionals assess and improve heating system performance effectively.