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Room thermostats

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!