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I decided to make an electric furnace because it's totally silent, I may use it inside my workshop, I also may control temperature and I don't have to worry about lack of gas or wood coal.
The furnace works great, after an hour of preheating the temperature is ready to melt aluminium. I didn't test it to maximum temperature because 800 degrees of Celsius is sufficient.
An external case is a bit warm but it doesn't pose a problem in using it. I heat workshop in winter so I won't have problem with it :)
I am going to use this furnace mostly to cast aluminium, later I am going to use it on lathe.