oven for non - metal melting , in particular silicon melting , with a housing enclosing an interior , at least one mould arranged in the interior for receiving a non - metal melt , at least one electrical heating device enclosing , at least partially , the at least one mould for influencing the temperature of the non - metal melt , and a power supply device connected in an electrically conductive manner to the at least one heating device for providing the heating device with a time - variable current i , wherein the current i has a frequency of 0 . 1 hz to 1000 hz and the current i is of a magnitude sufficient for setting a predetermined temperature of the non - metal melt , the currents in the plurality , where necessary , of heaters having a defined phase position in respect of one another .