Can the Gas Safe engineers let me know (not the favourite boiler) but the best boiler for quality, reliable, and physical size. It is for a replacement FE system with approx 4 single rads, 3 double rads, 2 large towel rails. It also needs to be very compact no more than 400 x 300 max and flue is through the side wall and extended to go up. Existing is an Ideal logic, but not sure they are really reliable and do not have stainless heat exchangers. Recomendations please and anyone cover Bucks