Cheers Wulfie, I wasn't planning on connecting it to a boiler/radiators etc.
We are in a bungalow and have a 5kw burner in the living room. Once the room is hot if you open the door it warms the rest of the house bearing in mind we dont like hot bedrooms its adequate.
I did at one point cut a 4 inch hole in the lounge and bedroom ceiling and install an inline shower fan to suck hot air out of the lounge and into the bedroom, worked a treat but it made the bedroom too hot for us so no longer used.
For just a woodburner i'd say that it was a pricey job. Also bear in mind if you go over 5kw you need to install permanently open vents into your room which means draughts and kind of defeats the point of the burner.