For the purpose of comparison- In the States the most common for of supplimental bathroom heat is a heater built into the exhaust fan/light unit.
This is either a fan that does NOT vent, but simply recirculated bathroom air after heating it, or an additional light socket into which an infra-red bulb (250 watt) is inserted.
Some clever folks simply install a recessed light fixture, and place an infra-red bulb in it. The parabolic reflector in these bulbs does a fine job of heating the floor below- quite nice when you step out of the shower!
Older homes (such as mine) have a space heater built into the wall, with a simple toggle switch. These units, which are little more than glorified toasters, usually have their own 115 v, 15 amp circuit.
None of these methods are usually GFCI (RCD) protected.
A fancier type of heater mounts on the wall, usually along the bottom of the wall. It has a heating element inside a finned, oil-filled tube. When hot, a small fan comes on and circulates air over the tube. The thermostat is part of the switch mounted on the unit, and is adjusted by turning the knob. This style is usually fed by a 240 volt, 20 amp circuit.
