G3 Unvented cylinder installer req Wakefield area

[imbiz77]

Hi, Looking at getting a new boiler with an unvented cylinder fitted. Our current system is an old gravity fed. Flow rate is 20l with a 1.5 bar. Its a 4 bedroom house with 2 bathrooms and 9 rads with an additional 3 rooms in the loft sometime in the future . Our first floor bathroom is very small and have decided to loose a bedroom in order to accommodate a bigger bathroom. This is where the cylinder will go.
My question is would our microbore be sufficient or will it need taking out?

Thank you