if u have a problem with the cold water, then it dont matter bout the boiler make etc. It could be something simple as water hammer. U'l still get hot water cos this will be from the cylinder and tanks so the flow wont change. this could to do the pipes not been clipped correctly on your pipework ad it moving due to mains pressure. it wont make noise wen turning on hot water cos the pressure wont b high (because of head of water pressure etc.)
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