What is the efficiency?
First of all, there is a distinct difference between combustion efficiency and thermal efficiency. Combustion efficiency is determined by the percentage of fuel converted to usable energy given sufficient combustion air. In our tube heaters, we provide sufficient excess air to achieve complete combustion; therefore, 99.9% of all combustible constituents of fuel is converted to carbon dioxide and/or water vapor, and nitrogen (excluding trace compounds). Thermal efficiency directly measures the flue losses based on CO2% in flue gas and flue gas temperature. For example, the LTU Series’ CO2% is 7-8.9% and the flue temperatures are below 350°F, which complies with the American National Standard. Given these two facts, the thermal efficiency of our tube heaters is 75 to 83%, depending on the model. We feel that while thermal efficiency is a good measure for forced air heating systems, it is not the best measure for a radiant heating system. We think the best measure for a radiant system is
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