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Gas hot water central heating

I am after installing Gas heated hot water central heating using radiators. I have gas heated hot water at present (natural gas). I would like three radiators installed on the ground floor. The pipes will need to be lagged in a conduit, and run around the outside of the concrete slab, entering the house through the walls. I attach a plan showing the layout, with radiators marked with an X I would like a condensing boiler. Regards Tony