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Ooh, interesting...
But does that mean your house basically has to be the same temperature throughout?
Our architects have specced two zones per floor, six in total: living room/kitchen on our ground floor, then a separate zone for each bathroom on the first and second floors.
Made sense to me because I imagine we'll want bathrooms warmer than other spaces and we'll spend more time on the ground floor, but do you think we're doing it wrong?
Like most architects they are - in the nicest possible way - generalists and not experts on heat pump tech.
Fox
dbr
Current thinking, especially for ASHP operating at low(er) flow temps, is not to zone at all, rather have the entire region inside the thermal envelope be a balanced single zone.
Unless you hermetically seal the zones from each other, the ones set to a lower temp will still be heated by the emitters in the higher-temp zones, causing the flow temp to creep up and the boiler/heat pump to work harder in an attempt to reach a set temperature, exacerbated by the now-reduced flow volume.