Large furnace, a high radius and three return involved, the full combustion air heating surface high utilization, high thermal insulation materials, boilers, heat loss to a minimum! More than 90% thermal efficiency, intelligence, automatic control, with automatic temperature adjustment, over-temperature standby, low-temperature freezing winter night, etc., and to achieve automatic adjustment according to changes in outdoor temperature heating temperature function! Imported burner, atomization pressure, complete combustion, low noise! Using pressure connection structure, safe, reliable, long life, with over-temperature, water, overload, ignition failure, abnormal flame, gas boiler pressure, gas leaks and other self-protection function of multiple chains, room temperature operation of all security risks !