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    32 main pipe instead if 22 (or 25)

    Hello, My heat pump engineer asked me to change the main to 32mm pipe, I think I have a 22 or 25 at the moment. I made a quote with Thames water and it will cost me around 3500 pounds to do it. My question is do I need to do it? I have 4 bathrooms on 4 different levels. If yes, there will be...
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