Making aluminium melting Electric Furnace

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 perfectly, 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 :)