There are several different types of boilers available, including high-efficiency units designed to help diminish high heating costs. If your heating system is more than 12 years old, you may be able to achieve substantial savings by switching to a newer high efficiency model.
Boiler Power is measured in BTUs, or British Thermal Units. This figure represents the amount of energy required to increase the temperature of one pound of water by one degree Fahrenheit. Every building has a unique BTU requirement based on its geographical location and climate.
Any boiler with an AFUE rating of 85 percent or more is considered to be a high-efficiency boiler; many of these are Energy Star-certified, which means they meet strict energy-efficiency guidelines .Condensing boilers can reach ratings of over 95 percent when used with an outdoor reset modulation feature that accounts for outdoor temperatures. Electric boilers are nearly 100 percent efficient because they produce no waste gas; they can be a good option in areas of the country where electricity costs are low.