It's thought to be 5770 degrees Kelvin, which is the surface temperature for the sun.
No.
The solar panel pumps are not working,then may be solar panel copper tubes block,may be water not store in feed water tank.
There are two types of solar furnaces: The first is a mini one which is just a mirror. Reflect the sun's energy to heat up a pot of tea or cook some sausages The second is a huge array of...
France
It depends on the type of furnace and the manufacturer.