It derives the energy needed to operate the internal circuitry directly from the magnetic field of the conductor being monitored

If the contacts close but there is no amperage draw on the heater lead

Does the stem length include the threads

This MARS 32635 70W heater features a rugged

Enhanced Durability: A stainless steel tip and outer sheath protect the internal elements from thermal fatigue and corrosive flue gases

Johnson Controls R-3710-2010 Restrictor Els PW 17895 It derives the energy neededJohnson Controls R 3710 2010 Restrictor, Inline Adjustable Restrictor, Pin Valve Type, 5 32" Tube Connections, Brass, 100 Psig Maximum Pressure R 3710 2010 is the direct replacement for R 372 3