What is the typical exhaust gas temperature range for a high-efficiency furnace?

The typical exhaust gas temperature range for a high-efficiency furnace is between 100 degrees Fahrenheit and 150 degrees Fahrenheit. This range is significant because high-efficiency furnaces are designed to extract more heat from the combustion process, which results in lower exhaust temperatures compared to traditional systems.

High-efficiency furnaces utilize condensing technology, which means they can capture and use the heat from water vapor in the flue gases. This leads to the lower operating temperatures observed in the exhaust. A temperature within this range indicates an efficient operation, as it signifies that the furnace is maximizing energy use while minimizing heat loss. Furthermore, exhaust temperatures that are too low can lead to condensation, which may cause corrosion issues, while temperatures that are too high can indicate inefficiencies or potential problems with the system.

Understanding this temperature range is crucial as it helps in assessing the performance and condition of a furnace during inspection. It serves as a benchmark for identifying whether a high-efficiency furnace is operating within expected parameters.