Electrical heat swich without room thermostat

[Kaboo]

Hi everyone,

I am looking to install electrical heat switch with towel rail in my WC. In the wider home setup, I have HUBr and one Room Thermostat which sits inside my living room, then have 6 Wiser radiator thermostats in the various rooms and hallway. 

From my reading the manual and instructions, Electrical Heat Switch needs to be paired with a Room Thermostat? Is that correct? If so, will it occupy the only room thermostat that I have and the thermostat will need to sit inside the WC? That will be an overkill to put a pricey thermostat in a tiny WC. 

Cheers