The 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% efficiencysaving money by burning less fuel. The standard 7-day 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 componentsproving its built to last. Please call or visit us in our show room for more information.