Overview The new Trekker pellet insert with Efficient Energy (E2) technology is the most powerful and efficient insert ever designed by Quadra-Fire. E2 technology helps achieve 83.2% efficiency—saving money by burning less fuel. The standard 7-day wireless programmable thermostat, 52 lb hopper and easy-clean cast iron firepot ensure this pellet insert is easy to operate. And these efficient pellet-burning inserts are the only inserts available with cast iron construction on all major components—proving it’s built to last. Quick Specs BTUs: Up to 51,000 Input Heating Capacity: Up to 2,900 sq ft BTU 16,400 - 51,000 Input Width 32 in. Height 29-3/4 in. Depth 28-1/8 in. Weight 425 lbs. Heating Capacity 1,300 - 2,900 sq ft. Hopper Capacity 52 lbs. Glass Type Ceramic Efficiency 83.0% EPA Certified Yes