Min. Efficiency 78% Max. CO emission 0.3% Wood Capacity 4.8kgs Output to room 20,000BTU (6kw) Flue Size: 150mmú¿6ísú¬ Output to water 50,000BTU (15kw) Heating 10 - 12 radiators and 185sqm Rear and Top flue outlets. 827mm(H)í-650mm(W)í-580mm(D) Net Weight 223kg.