Air-water heat pump current consumption and data

So I am continuing with the analysis. Thermal bridges should not occur due to the type of construction. In winter at -15 degrees, I checked the critical spots indoors with the IR thermometer. I couldn't find anything unusual, except that the ring beam and concrete surfaces were a few degrees colder than the masonry. But that is normal. Nothing was below 14 degrees.

The underfloor heating ran for the last time with us on 08.05. BDT was 0.5. Current annual consumption 3200kWh heat including hot water.

I am currently running supply temperature at 29.5 degrees and return setpoint is 25.4 degrees. Outside temperature is 8 degrees. With that, we achieve around 22.5 degrees inside the house.

If your insulation is good and your underfloor heating is reasonably properly designed, then with a proper hydraulic balancing you can lower the return setpoint by one degree at the same indoor temperature. So get started on the thermal balancing in November!

Direct comparison for me: Same bricks as you, 200m2 without a basement, barely reached kfw55, at 9 degrees outside temperature the return setpoint is 24.3 degrees and with that the house is almost too warm. So never below 22.5 degrees, some rooms above 23 degrees.

Currently, I have lowered the heating curve by another degree because it was too warm inside the house.

Do you have all the shading / blinds down during the day to keep the sun outside?

Do you have all the shading / blinds down during the day to keep the sun outside?

We don't have anything like that. We have shutters and small windows. The sun doesn't shine often, and when it does, not much gets in.

OK, so this is roughly how I imagine your house now. It doesn’t look like there are any thermal bridges.