Ok. I tried a pipe stat on the 22mm hot water supply to the current bathroom job. Idea being it was a quick and basic means of detecting heat ( eg someone running the bath / shower / basin ) so that would bring on the large mirror demister pad. Crap hysteresis and pretty unreliable.
Question....
How much additional electronics are involved to just make the cable off to a thermistor instead and have that operate a solid state relay / similar to control the demister ? Can I get a 230v thermistor to save going low voltage DC control and the associated electronics etc as this needs to be left behind for the customer and not rocket science to repair / maintain ?
Thanks in advance.