What system have you got at present, and what size boiler? If not a combi, and not near 35kW then extensive pipework mods beckons, and 35kW may well need 28mm gas pipe from the meter, so a lot of work if the boiler is not near and the gas pipe is not up to spec.... You will also need a condensate drain you don't currently have. The differential cost of the boiler will be swallowed up in the installation cost several times over - when we did this a few months ago there were lots of Worcester Bosch recommendations - potential for 10yr guarantee which will be a selling point.
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