The Discovery II slow combustion wood fireplace celebrates the 25th anniversary of the best-selling 3100 Millenium wood stove. The unique design features an integrated wood storage area, together with all the Quadra-Fire features and technology… Burn time of up to 10 hours, Average efficiency of 71% and peak efficiency of 83%, Emissions of 1.4g/kg , Heating capacity of up to 27sq