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A 4 bathroom property will definitely need a decent incoming water supply delivering 3 bar pressure and at least 20 + litres a minute I've installed a 32 mm incoming supply on similar jobs , your current set up definitely needs upgrading to support the future demand, and a dedicated supply of at least 28mm pipework from the incoming water main to supply the unvented cylinder will be needed , I would let your chosen installer advise you on the best choice of boiler and cylinder for your home we all have our own ideas on these sort of projects. Regards Kop