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    Is proportional pressure mode of Grundfos UPS2 suitable for Heatrae Sadia Amptec?

    I have TRV on all of my radiators and my central heating pump is a Grundfos UPS2, the bloiler being Amptec. I have these questions: 1. Is the proportional pressure mode suitable for Amptec, or would it harm the boiler? 2. The proportional pressure mode is suitable for two pipe systems, my...
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