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AFUE, or Annual Fuel Utilization Efficiency, is a measure of how well a boiler system uses fuel to generate heat. A higher AFUE rating means the boiler is more efficient in converting fuel into energy than a lower AFUE boiler. If you're looking to purchase a new boiler, it's important to understand AFUE ratings and how to choose the right one.AFUE ratings are expressed as a percentage and range from 80% to 98%. A boiler with an 80% AFUE rating means it only converts 80% of the fuel into energy, while a boiler with a 98% AFUE rating converts 98% of the fuel into energy. The most efficient boilers are those with the highest AFUE ratings.When choosing a boiler, it's important to consider its size and type. Boilers come in a variety of sizes and types, including gas, electric, and oil-fired. The size of the boiler depends on the amount of heat you need. For example, if you need to heat a large home, you'll need a larger boiler than if you were heating a small apartment.In addition to size and type, you should also consider the energy efficiency of the boiler. Boilers that have higher AFUE ratings are more efficient and will save you money in the long run. You should also consider the cost of installation and maintenance for the boiler.Finally, you should consider the environmental impact of the boiler. Gas-fired boilers are more efficient than electric boilers, but they can be a major source of air pollution. Oil-fired boilers are more efficient than gas-fired boilers, but they can also be a major source of air pollution.When it comes to choosing the right boiler for your home or business, it's important to understand AFUE ratings and how to choose the right one. Consider the size, type, energy efficiency, cost of installation and maintenance, as well as the environmental impact of the boiler. With this information, you can make an informed decision to ensure you get the best boiler for your needs.