... ,long service life . SANHE AUTO-COAL HEATING MACHINEThe features are as follows:1) Using full auto control, consistent temperature, the temperature of ... , energy saving and cost saving, reduce the heating cost as high as 30%4) Using SANHE unique furnace guarding heat system, ... and hot air walk their own way,absolutely no pollution. 6) Thermal conversion reaches as high as 80%-95%, fast warming, small ...