I went to customer who has under floor heating where the thermostats and double pole isolators were causing problems. 2 had burnt out one was busy in the process of melting (i can smell burning!). Did the usual checks, then temporarily connected the under floor heating load just to see the current draw. 18 amps at one stat point and and 21 amps going through another. That's either a lot of under floor heating or there is some other fault. At these 2 point there are 2 pairs of cables going down to the under floor heating (2.5mm flat coming in to supply it). I was wondering does anyone know anywhere where I can get a 2 zone thermostat. in other words one stat, with 2 switching points so the load can be switched by 2 contacts rather than the entire load going through one.