A low water sensor within the vessel is connected to a relay coil with contacts interrupting {HEAD ~ the flow} of electrical energy to {TAIL ~ the heating element} when water is beneath the level of the sensor 
A low water sensor within the vessel is connected to a relay coil with contacts interrupting { HEAD ~ the flow } of electrical energy to { TAIL ~ the heating element } when water is beneath the level of the sensor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH