The 4.1 - 4.6 m2 (or 700 watts) Hotwire Under Tile Heating Kit is perfect for heating smaller rooms like bathrooms and ensuites, laundries, mud rooms or even kitchens. It is quite easy to install and full video instructions are available. Hotwire even offer a network of installers across Australia if you want to employ someone to help.
Under Tile Heating is installed immediately under your tiles. Head over to the In Screed Heating products if you are installing a Sand and Cement screed or polished concrete floor. Under Tile Heating offers a quick heat-up time of normally less than an hour. As the heating element is only 4mm thick it really doesn't add to your floor height as the element is absorbed into the tile glue.
If your tiler would prefer they can also install a layer of tile glue or floor leveller to bring the floor back to a perfect level.
You can download the installation manual here.