This is balcony type solar ondol heater.
It is able to produce heating in one room. And it is assistance heating. Auxiliary heat source uses electricity and is built-in.
When applying solar heat to heating, it establishes a solar air-conditioning and heating system, and in so doing energy efficiency is increased.
It establishes a solar air-conditioning and heating system - heating in the winter and providing air-conditioning in the summer. So it is uses solar energy for air-conditioning and heating.
If the solar heating mechanism is used only, better to use when there is a lot of sunshine.