Tunnel Stove with a back boiler...???

Hi,
I have recently got planning permission and will soon be starting the building process. We have currently an open plan design- kitchen/living/dining room about 6.7m wide and 11.4m in length. We have put in a back to back fireplace. We were thinking of putting in a large tunnel stove which would divide the kitchen/ dining and the living room yet still leaving it open plan and because I love tunnel stoves! My partner wants to put in a back boiler to heat the water. I cant find many tunnel stoves that are also a back boiler. I used a website to work out we would need a stove of 14kw to heat the room as it is very large. Does anyone know would it be feasible to get a tunnel stove big enough and that would be a back boiler and where we could look? Any info would be greatly appreciated! Neither of us know much about the praticalities so maybe its not possible!! Thanks