The heat source controlling circuit 42 of the heating system includes a transistor 422, a current limiting resistor 424, a diode 425 and {HEAD ~ an oscillating circuit} 423 having {TAIL ~ a variable resistor} 426 
having
The heat source controlling circuit 42 of the heating system includes a transistor 422 , a current limiting resistor 424 , a diode 425 and { HEAD ~ an oscillating circuit } 423 having { TAIL ~ a variable resistor } 426
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH