High Efficiency Oil Boiler
A high efficiency oil boiler is a water heating unit fired with oil that has high efficiency, up to 92% for some models. These boilers use condensing technology to wring out all the heat possible from the exhaust gases.
Look for Energy Star labels, and efficiency ratings greater than 88%, even up to 92%. Efficiency is rated as Annual Fuel Utilization Efficiency (AFUE). There are fewer models of high-efficiency oil boilers available than gas because gas is a more common heating fuel than oil across North America as a whole.
By using 4% less oil than a standard model, these boilers reduce your energy bills and your greenhouse gas emissions.
High-efficiency condensing boilers are so efficient, capturing so much of the heat of combustion, that their flue gas is low enough temperature to go out through a plastic pipe without melting it. It's amazing to think of a combustion appliance with a plastic chimney!