A typical residential heating system using pure fuel to generate heat, circulating it through a community of ducts and vents, might be categorized by its effectivity. Older fashions, sometimes called normal, convert a particular share of the gas’s power into usable warmth. The Annual Gas Utilization Effectivity (AFUE) score quantifies this conversion. As an example, a unit with an AFUE of 80% transforms 80% of the fuel into warmth, whereas the remaining 20% is misplaced, sometimes via the flue.
Such heating methods have been as soon as commonplace, offering an economical answer for a lot of householders. Their sturdy design and comparatively easy mechanics made them dependable and simple to keep up. Nonetheless, with growing power prices and a rising consciousness of environmental impression, these methods are being outmoded by extra environment friendly options. Whereas the preliminary buy worth is perhaps decrease in comparison with high-efficiency fashions, the long-term operational bills might be increased attributable to elevated gas consumption.
