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    Parts required Unvented system

    I'm fitting a Worcester 40CDI system only boiler with an Ariston Classico 300L unvented tank, the house is very large and will have around 200m of 22mm copper pipe and 20 rads in the radiator loop (Total of 110k btu). The questions are... 1) I'm fitting 2 Wilo gold 6 mtr head pumps...
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