Specifications Min. Efficiency 70% 670mm(h)íß480mm(w)íß430mm(d) Max. Co emission 0.3% Wood capacity 1.5kgs Output to room 20, 000btu (6kw) Flue size: 125mmú¿5ísú¬ Heating 55sqm Net weight 89kg Non boiler type Rear and top flue outlets. 670mm(h)íß480mm(w)íß430mm(d) Net weight 89kg.