Hello @thedawnbefore I’ve created a little web tool to calculate expected system temperatures for a heat pump system with a heat exchanger: https://openenergymonitor.org/heatexchanger/2.html. I have written more about this over on an other thread here if you haven’t seen it already: https://community.openenergymonitor.org/t/incompetent-installers-incompetent-regulation-do-i-need-a-mim-b19n/21411/214.
It would be interesting if you could compare your measured results to those that this calculator suggests.