Unfortunately, that doesn’t really help you much, but I’ve read a few tests and often they only feature a small selection of devices. For example, I recently got a recommendation from a colleague to look at Rotex and Tecalor. The parent company of Tecalor is the market leader in the field of climate technology, and an air-to-water heat pump comes from climate technology. I have never seen these companies in the tests so far.
We have a device from Tecalor (the parent company is Stiebel Eltron, Tecalor is a brand), a THZ 504, which is a combined unit, but so far we are quite satisfied with it; it heats the house efficiently, brings fresh air into the house, and you don’t have an outdoor unit that disturbs the neighbors.
I don’t understand that either.... there are tests for every little thing.... you can even look up ratings for doctors, but not for an 11k air-to-water heat pump.
Because the topic is complex, most people just have a heating system installed by the heating engineer of the general contractor (at least here, 75% build with a general contractor), and the devices are too expensive for a testing institute to just set up a few for testing. Even so, the BAFA list has 93 pages full of heat pumps, so it would only be a tiny slice of the market. Everyone visits a doctor or buys something from Amazon at some point, but how often does one buy a heating system? The thing just has to keep the place warm and not consume too much electricity.