Energy efficiency is key when choosing a heating appliance. Higher efficiency lowers bills and reduces environmental impact. The SP34 is Canada P-4 approved at 70.18%/70.07% AFUE, delivering 20,500 BTU/hr for both natural gas and LP. With efficiency ratings of 67.14% for natural gas and 68.91% for LP, the SP34 is a cost-effective and eco-friendly home upgrade.