The latest addition to Jøtul's award-winning cast iron and steel line of woodstoves, the Jøtul F 35 Rockwood is the perfect small heater for your house or camp. Utilizing Jøtul non-catalytic technology, the Jøtul F 35 Rockwood achieves a low 1.2 grams/hr emission rate and an efficiency of LHV 73.67% HHV 68.5%