I have a new NIBE pump (S735) that replaced my old, also NIBE (Fighter 640P) pump. It's a bit more silent than the older one usually, but sometimes it starts what sounds like a jet engine which is pretty loud. I can hear it from upstairs, far away from the pump, coming from the vents. I am not sure what it's doing when it makes that noise but it made me a bit upset with it, as initially I had hoped for a quieter house, and the pump was pretty expensive!
Especially now with all the integrated circuits and sensors, we can have a clear picture on the products if we could all share these data.
I’m looking to get a heat pump too and was leaning towards the NIBE make that these data seem to validate. (They’re incredibly silent too!)