DID YOU KNOW?
AFUE stands for Annual Fuel Utilization Efficiency, and is expressed as a percentage of how energy efficient the heating system is. A higher AFUE means higher efficiency.
BTUH stands for British Thermal Units per Hour and is used to measure the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. The BTUH should be determined by an HVAC professional.
* Sizing application is provided as an example only. Consult your local Lennox dealer for actual requirements.
** Optional conversion kit available for propane applications.