Stylish Saltfire CS5 Multi Fuel Inset Stove 5kW. The Saltfire CS5 5kW Inset Stove can fit into a standard UK fireplace opening or can be built in higher up in the wall for a more contemporary feel. The CS5 is a multi-fuel cassette stove able to efficiently burn wood logs or smokeless coal - the ashes will fall through the grate and into the ash pan which easily lifts out for emptying.