1.Adopt the special three -backward stock ,the dust can be removed automatically in the heat exchanger . 2.Auto-alarm functions and automatic protection device . 3.ventilator and fan can start and stop automatically . 4. automatically control wind input and output.automatically control the temperature . 5. There are two temperature control systems ;computer controlled and digit-controlled . 6. special designing of heat preservation to ensure the lowest heat wastage . 7. The firebox has been specially designed with much longer service life ,apllied to vartious kindsof coal ,heat efficiency amount to 90% 8. this machine unifies burning and heat transfer together ,special indirect heating technology ,smoke and air walk their own way . 9. Heat efficiency amounts to 80%-90% warming up fast ,small volume ,easy setting ,high reliability ,low price .