heating curve

  1. H

    Viessmann 222-f heating curve & other things

    Hi all, this is my first post so I apologise if this has been discussed. I have looked. Also apologise for very long post! I’ll be amazed if anyone actually reads this let alone answers the questions but it’s worth a shot! … We had a Viessmann 222-f fitted to our conversion house. It’s an old...
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