Features:1adopt the latest international technology, unique large volume design in combustion chamber. 2equipped with the world brand riello burner ensure full combustion, higher efficiency and lower failure rate. 3adopt the advanced corrugated furnace design which increasing the heating area, resist its expanding after heated.4thermal conversion reach as high as 99.9%stable air supply. 5automatic control system operate easily, warming quickly. after setting, burner would automatically start on, fire, supply air and stop for keeping steady temperature.6special insulation design which minimize heat loss. 7all the technical index meet the national environmental protection I standard. Technical parameter:technical parameters 50000kcal 100000kcal 200000kcalheat output power kcalh 50000 kcalh 100000 kcalh 200000 kcalhheat efficiency % 90% 90% 90%fuel natgas natgas natgasconsumption kgh 3-6 nmh 9-12 nmh 18-24 nmhway of control auto auto autoair flow mh 8700mh 14000 mh 17400 mhtemperature rise 80-120 80-120 80-120 power source vhz 380v50hz 380v50hz 380v50hzelectric power kw 0.6kw 0.7kw 1.2kwdiameter of air outlet mm 400mm 400mm 400mmweight kg 400kg 600kg 700kgdimensionlengthwidthheight mm 14008501370 16009001400 170010001500material of frame galvanized +spray paint galvanized +spray paint galvanized +spray paintquality guarantee period one year warranty lifelong service one year warranty lifelong service one year warranty lifelong service