The automatic heating system sensor is a diode placed in a waterproof tube as shown in the figure. The circuit has the trigger point set at P1 acting on a relay that controls the heating element. The heating speed is set in P2. For the low voltage sector, the circuit already has its own source. The heating element can be commercial or made with 470 ohms to 1.2k wire resistor with 10 W dissipation.
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