[assuming you mean "not the transmitter box]. It's the 'transmitter box' which contains the temperature sensor, so you couldn't use the other bits of the system without it.I want to use the prog room stat with the screen, bot the transmiter box.
Given that you have the required cable in place, that would certainly be the simplest (and, IMO, most sensible) course. It's not as if standard wired thermostats are very expensive - you'll probably make a profit if you can sell the wireless one!If i cant use it i may sell it on gumtree and get a wired unit.
Kind Regards, John