to solve !!!get a kenlow thermal switch -insert the probe into the top hose and supply power(NEG/POSITIVE VIA A RELAY PREFERABLY )OR USE YOUR LOOM IF YOU HAVE POWER AND RETURN(EARTH)-set the dial to whatever temp u you req'r-water heats up sensor(probe ) picks up tempratuer and kicks in -job done forever and a day-guru7001/2 e bay-old school stuff AGAIN-LOL