my plumber installed a new immersion cylinder for me and advised me to put a thermostat on the pipe. Currently the immersion is wired via an immersion switch. Neutral and earth wiring i understand. I have one live wire feeding the switch and two live wires going from the switch to the immersion, one for sink and one for bath. Iwas just wondering how to wire in the stat. It has three terminals marked C, 1 and 2.