Our boiler is currently in the smallest bedroom in a cupboard. There is also an immersion tank in there. The bathroom is next door and I was thinking about buying a boiler that would go on the wall in there instead. What boiler would you recommend (the space is only 43cm wide). We have 2 bathrooms - one on the third floor so the pressure needs to get up to there. Would it also be very expensive and do we still need the immersion tank? Thanks