The Xtract™ heat exchanger optimizes the transfer of heat from the extremely hot gases to the water, making the E-Classic 2400 one of the cleanest and most efficient ways to heat with wood. Utilizing biomass fuel, the E-Classic 2400 can provide a comfortable, even heat to multiple buildings and workshops. It can also heat water and replace multiple indoor wood stoves. Burning wood, a totally renewable resource, can significantly reduce your carbon footprint compared to heating with nonrenewable fuels.