We had decided on a brine / water heat pump Vitocall (333-G). This pump has a very high level of performance (COP = 4.6) and has a low-power high-efficiency DC pump. This achieves the pump at the BAFA currently promoting the highest support posts.
Very positive is that the heating load calculation shows that our house needs a heat load of 4.09 kW. That is, a small geothermal plant at 5.9 kW is sufficient for our house. Originally a plant was planned at 7.8 kW, which leads ultimately to a significant reduction in costs.
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