We need floor space in our 3rd floor bedroom renovation, and would like to move the old radiators, and replace them in another position under the windows. The old ones are too tall for this, but Hudson Reed has ones that are the right size. We want to use their radiators, has anyone tried this, are they any good. do they hook up to an existing system that is working fine? (we have complete access to the joist area in this room, the floor will be exposed for some of the project. We don't want to use under floor heating.