The Australian range of TTS heaters come in 4 models from Derby Heat Banks to suit different conditions.
The image above explains the sizing and kilowatt hours for each heater.
A further note below explains how large a room can be heated by each model and measurements taking in the ceiling height as well as the room's floor dimensions, thus measuring the approximate volume of air that can be heated by each model. Climate can also make a difference to volume of air that can be comfortably warmed by the TTS heaters. Heating similar size areas can also depend on the level of the building insulation, furnishings, wall types, floor coverings and even the house aspect.