Its a wall mounted switch also its in a room about 2m sq the fuse holder that you push in is burnt and inside the switch is all deformed where the fuse sits and the fuse is discolured on the ends.
Hi I had a water tank fitted last year its on economy 7 with 3kw immersion heater running on 13amp switch have noticed switch has started to get hot and melt have changed it for new one but that gets warm on the fuse cover do I need to change the type of switch.