Mulberry Stoker Insert NB 6.5kw (Taperback)The Mulbery stove was one of the first inset stove to grace the market and has more or less been unchanged since it launch, the tapered back allow this unit to be installed were other unit may not be suitable and the the external width of the fire box means it is ideal for fireplaces opening slightly less than 400mm wide. Don't be fooled into thinking that because of the tapered firebox the heat out put will be lower than some of it rivals, believe us