I like to see the inners of other peoples boats so get posting .
Anyhow last time I was on Waterlily overnight I wired in the thermostat. I set it as best I could but to a hottish pipe. Today I lit the fire after the boat safety check and left it to see if the thermostat switched on the pump at a reasonable temp - it worked perfectly. It has switched on and off about half a dozen times today with a smallish fire going so it it working as I expected. It means we can leave the system to look after itself overnight.
Another little job done.