{HEAD ~ The heat source controlling circuit} of the heating system includes {TAIL ~ at least an oscillating circuit}, a transistor and a diode for controlling the heating frequency of the heating mechanism 
includes
{ HEAD ~ The heat source controlling circuit } of the heating system includes { TAIL ~ at least an oscillating circuit } , a transistor and a diode for controlling the heating frequency of the heating mechanism
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH