Just because life's never simple, the thermostat on the wall conked out. We have a (soon to be replaced with a better system) hot air heating thingy, and the thermostat switches a 24V circuit feeding a relay, so a low current. Looking at Screwfix, the cheap and cheerful types seem to quote serious currents and some specify 230V AC, while others specify batteries.
Now, I can understand that some might be doing some fancy things and need a mains feed to operate but am I right in guessing that a battery operated version that quotes '2 wire installation' should simply operate as a temperature sensitive switch and do the job I need or is there something more subtle here?
I did notice a 24V version quoted as being the thing for hot air heating on TLC but I can't spare three days to wait in for it to be delivered this week and it's a lot simpler to scoot over to screwfix etc!