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

Bookstar schrieb:

In the past 8 hours, the system required 50 kWh of heat demand and used 13 kWh of electricity.

The system is running efficiently, but the heat demand is huge.

That must be due to the building envelope, meaning the structure itself, not the technology, heat pump, underfloor heating, etc.

face26 schrieb:

But that then depends on the building envelope, not on the technology/heat pump/underfloor heating, etc....

I am trying to find that out. The building envelope is technically excellent and free of defects.

Have you ever used an IR camera to check so you know for sure?

Yes, there is a thermal bridge assessment (all good), a blower door test (very good), and an inspection. Nothing is missing, I’m sure of that. Measurements were also taken with an IR thermometer. The humidity level is fine, actually rather dry. So I can’t even find the slightest indication of a problem.

Well, maybe I’ll understand more in the coming days, it’s very exciting. The temperature is currently dropping by 1 degree Celsius (1.8°F) every hour, and tomorrow morning it’s expected to be -16°C (3°F). I’m sure the heat pump will fail with an error, and the energy consumption tomorrow morning will shock me 😀

And what are you comparing it to that makes you consider it poor?
You can’t compare your 250m² (2,690 sq ft) with others’ 150m² (1,615 sq ft). One has a compact box shape with insulation just shy of passive house standards, while the other has projections at the front and back, balconies, and bay windows. Ceiling height is 2.75 meters (9 feet) with good but not excessive insulation.

Unless someone leaves all the windows tilted open, of course, that would also explain it.
😉

Do you have a mechanical ventilation system with heat recovery? Maybe it’s exchanging too much air? I have mine turned down deliberately when below 0°C (32°F).