Hi Guys/gals, just moved into a property in Wales with wet ufh, still trying to get used to it, does seem to be burning lots of oil, it's a invisible heating setup, about 10 years old, big house, the thermostats are Wlta-19 oj, 2 wire, with a small wheel and increments, the hall area today was calling for heat even though the therm was right down, outside was around 10 degrees so not cold generally, I removed the cover and selected 0 on the selector to stop it kicking in and wasting fuel, the system is on constant as this was said to be the best way to operate, I would like to change some of the thermostats to more user friendly items, need to get more familiar with the system, any advice appreciated. Dave