Hi All,
As mentioned in the title, I have a Panasonic Aquarea (KIT-AQC12HE8) split heat pump for my home.
The issue I’m experiencing is that when the heat pump starts preparing the DHW, I can see that the DHW tank’s temperature begins to rise — but at the same time, the buffer tank’s temperature also increases.
This was not really a problem back when the puffer tank contained hot water for my underfloor heating. However, now that the puffer tank is used for supplying cold water (~10 °C) to the fan coils, this temperature rise is quite noticeable.
I’ve also attached a graph from Home Assistant. In the graph, “Tank” refers to the DHW tank, and “Zone 1” refers to the buffer tank.
A few weeks ago, I reported this to Panasonic maintenance. They concluded that the diverter valve was the likely cause, so they replaced it under warranty and also cleaned the filters (which were not particularly dirty).
Now I’m turning to you for advice — maybe some of you have experienced the same thing or could share a few tips on how to solve it.
Looking forward to your feedback!