Convection heaters, as the name suggests, work with air convection currents that flow through the units and come into contact with the heat sources. Convection, in a nutshell, basically the transfer of heat caused by molecules in fluid substances like gases and liquids. It works much like an oven, though of course it won’t cook you until you’re well-done.
Thus, these heaters work by heating up air and allowing it to rise, thereby letting cool air take its place. The heaters will then keep heating up air, continuing the cycle until all the air in the space has been heated. This means that convection heaters work with the natural movements of air molecules vis-a-vis temperature.
Unlike fan forced heaters, which also rely on air to spread heat, convection heaters have a quieter operation because they do not use a fan. These heaters are also not like convection heaters, since convection heaters work by directly heating objects and surfaces, and cannot heat air. Like these two other types of heaters, however, at the heart of convection heaters are various heat sources.