I have one bathroom which back onto a shower room and at the end of both there is the airing cupboard (if that makes any sense). I would like to install underfloor heating such as the devimat system and this needs a fused spur and a controller/thermostat outside the bathrooms (e.g. airing cupboard). In the airing cupboard there is an switch (no fuse) for the 3kW immersion heater which comes off its own circuit from the consumer unit in the garage. Now I never use the immersion heater and would be fairly happy to not have one. But does anyone have any better suggestions??? The Devimat installation data implies up to 16A although I only need 5 sqm for both bathrooms at 100W/sqm. Could I get away with a suitable fcu spur off the immersion heater? Alternatively, could I install a multi-pole switch such that the circuit powered either the immersion or the underfloor heating? Thanks in advance.