Boiler Repair and Installation
Boilers are available in two efficiency ranges: around 80 percent for standard conventional boilers, and percentages in the 90s for energy-efficient condensing units.
The dividing line between these efficiency ranges is based on the boilers ability to withstand condensing flue gases. Condensing flue gases, which occur in high-efficiency boilers, require special design considerations to tolerate the corrosive effects of the condensation. Boiler efficiency is defined as how much of the heating value of the fuel is being converted to useful heat.
Condensing boilers absorb more heat from combustion gases, allowing the water vapor to condense and therefore providing increased efficiency. Any hydrocarbon fuel burned in a boiler, whether it is propane, natural gas, or fuel oil, produces water vapor during the combustion process.
Conventional boilers are non-condensing boilers with materials that cannot tolerate the corrosive properties of condensing flue or stack gases. Conventional boilers operate around 80 percent efficiency, compared to over 90 percent efficiency for condensing efficient boilers. Other factors also influence boiler efficiency, including boiler shell losses, piping losses, and cycling losses.