Why heating devices are always placed under a window? If the windows are not properly insulated, the heat doesn’t just go out the window?
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Another factor is that if you have windows on one side of a room and a radiator on another side then the hot air above the radiator will rise, and the cold air by the window will fall, setting up a powerful convection current. This will result in a cold draught across the floor which is extremely unpleasant.
You like the heater by the windows just because you have the most heat loss there.
If you increase the temperature then you need to add energy everywhere to raise the temperature.
If you are keeping the temperature constant the energy the heater is relating only needs to compensate for the energy that has escaped out.
If you have perfect isolation no heating is needed to keep the temperature. So heating abounding is all about replacing the heat the escape.
So if the goal is to have the same temperature everywhere in the building you like to put the heater where the energy escape else the will become colder there. If you heat it there you can keep the whole room at a quite constant temperature.
IF you are happy to have it colder in the location where the windows are you can put the heater somewhere else. Then you have a temperature gradient in the house. It will require less energy as the heat loss depends on the temperature difference between the inside and outside. If you then want to keep it warm enough at the windows you need to have it warmer in the center,
The result is if you like to have a constant temperature in the house put the heater where the heat loss is the largest.
Heat rises, creating a barrier against the outside cold. Even if the window isn’t well insulated and some heat escapes, it’s a better solution than the frigid air getting into the room, and the warm air having to compete to warm the room. Also, condensation is caused, and it’s better to keep that against the glass, and in an area where there is movement of air.
The natural convection mentioned by u/saywherefore applies to any heating device, the unpleasant draft is intensified greatly if a flame heater like a gas or wood burning heater is used. No curtains on the window please!
The flames consume air and the air will be drawn from the nearest fresh air source, quite a strong air current can be felt this way. If the fresh air is coming from under the door across the room the whole room can feel chilly.
Placing the flame heater under the window and **opening the window** just a tiny bit draws fresh air for the flames to consume from the window and so prevents drafts from other sources and also preserves the natural convection present with any heater. Also improves air quality in the room by insuring that the room air isn’t consumed by the flame heater.
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