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