1700 square meters, our company's latest out of a can be filled only 2 times a day coal, thermal efficiency of more than 85%, automatic temperature control, like your temperature, 1.5 tons of 6000 calories per square meter coal is enough, like your 3800 calories, then, a heating season of about 60 tons of coal will be enough, the average person can operate, do not need to do the license, do not need an annual inspection, the price is cheap, the Tianjin Zheng Yan Energy-saving Heating Equipment Co.