Convector heaters heat the room under the influence of the flow and exchange of air masses. This flow can be forced (warm air can be blown out) or natural - gravitational. Convector heaters can be powered by electricity (resistance heaters) or hot water (central heating installation).
Resistance (resistance) heaters are heated by the heat generated on the resistor under the influence of current flow. This brings many advantages - ease of transport, power regulation (usually incremental) and quiet operation allow for convenient use of such heaters indoors. Resistance heaters are most often also equipped with an automatic shutdown system in the event of overheating.
15W resistance heater