An inefficient boiler can keep your house warm – but in doing so, it sends a large portion of the money you spend on fuel right up the chimney. The inefficient boiler simply doesn’t convert enough of your fuel into useful heat. It not only wastes heat while it’s operating, but it also loses more heat up the chimney when cooling down after it shuts off.
Today’s high-efficiency boilers are not only smaller and more compact, but they also convert more of the fuel you buy into the heat needed for comfort. Your fuel bills will be lower compared to an inefficient unit because more of the heat is extracted and used to heat your home. A minimal amount of heat is lost up the chimney.