... centigrade degree. That is to say only to heat a temperature difference of 20-30 centigrade degree can the working temperature be ... . It can save about 30% energy compared with the steam boiler.3 Low investment of equipmentDue to the reason that the system ... -proof material production, asphalt heating, non-woven hot-rolled machine, fiber, glass hot press machine, reactor, mould, drying room, oven, and ...