1 Yes
2 Tower do the RFRWT wireless thermostat but I reckon you will find it is exactly the same product perhaps with one or two slight differences.
I seem to recall Ravenheat selling the same product under their brand name as well.
However or wherever it is fitted a wireless programmable roomstat of any manufacture for a combi such as this needs 1 Live 2 Neutral 3 common and whether connected to 4 or 5 a switch wire.
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