ᐅ Air-to-Water Heat Pump: Current Consumption and Data

I will continue working on the analysis. Thermal bridges should not occur due to the construction method. In winter, at -15°C (5°F), I checked the critical spots inside with an 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°C (57°F).

The underfloor heating was used for the last time on May 8th. HDD was 0.5.
Current annual consumption is 3200 kWh of heat including hot water.

Bookstar schrieb:

I’m currently running a supply temperature of 29.5 degrees and a return setpoint of 25.4 degrees. The outside temperature is 8 degrees. This results in about 22.5 degrees inside the house.

If your insulation is adequate and your underfloor heating is reasonably well designed, you can lower the return setpoint by about one degree with a proper hydraulic balancing while maintaining the same indoor temperature. So it’s time to do the thermal balancing in November!

A direct comparison from my place: same type of bricks as you, 200m2 (2,150 sq ft) without a basement, just about reaching KfW55 standard. At 9 degrees outside temperature, the return setpoint is 24.3 degrees and the house is almost too warm. So not below 22.5 degrees anywhere, with some rooms above 23 degrees.

Currently, I’ve lowered the heating curve by one degree again because the house was too warm.

Do you have all the shading devices / external blinds lowered during the day to keep the sun out?

Oetzberger schrieb:

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

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, this is roughly how I imagine your house now. It doesn’t seem to have any thermal bridges.