Air-to-water heat pump without buffer storage | Heating installer refers to building energy law requirement

Since we didn’t want to start a minor war because of the ERRs, we agreed with the Heizi on "zones" in which similar temperatures are to be controllable. That means we have a total of three ERRs: one ERR for everything related to living (i.e. cooking, eating, office, children's room, etc.), one for bathrooms (= somewhat warmer), and the third for sleeping (= somewhat cooler).

In practice, we don’t really use the things (you really don’t need them), but I didn’t feel like having skirmishes with the red tape. And those few E(eu)RR(o) were worth it to me ;)

Really? Hmm, then we probably have multi-room zones :oops:

If nothing helps, have 25 liters of buffer storage installed. I think the efficiency loss is so small that I’d rather accept it than argue with the heater forever.