In the loft of my bungalow, there are water tanks for the heating and shower, as well as a pump, 2-port valve and a manual valve to isolate the the heating coil in the hot water tank below in the airing cupboard. All of these will be removed.
The pipes to and from the current boiler in the garage are 22mm. They go up to the loft then down from the loft back into the garage where they go into the concrete floor for distribution to the radiators. At some place in the concrete, the pipes change to 15mm for distribution to the radiators. In the concrete near each radiator, there are two inspection plates which gives access to the pipes. The 15mm pipes T-off(soldered) to about 6 inches of 8mm pipes which finally connect to the radiator valves.
Is this pipe-work likely to be a problem for a condensing combi?
Keith G. Powell