Air-water heat pump current consumption and data

Wonderful news on this freezing cold sunny Monday morning (-10 degrees). The heat pump took a 5-hour break yesterday and consumed a total of only 95 kWh of heat. It drew 33 kWh of electricity in the process. And this at an average temperature of -9 degrees. It's really impressive what is possible. If only it were always like this :). Absolutely positive: It is running completely trouble-free after the last technician visit *toitoitoi*

What did I change? I measured the return flows in the upper floor with an IR thermometer and noticed a large spread. Adjusted the Tacos. Also lowered the hysteresis from 2 to 1.5.

But I think most of the savings were brought by the sun, especially the 5-hour heating break...

And now please measure this every 2 minutes after the heating has been turned off, this way you can find heating circuits that return warm water to the heat pump too quickly.

Nice to hear, but I'm putting my finger back on the wound. You have a mod. heat pump, something is wrong, otherwise it wouldn't think of shutting down at an average temperature of -9°.

nice to hear, but I’m putting my finger back on the wound. You have a modulating heat pump, something’s not right otherwise it wouldn’t think of shutting down at an average temperature of -9°.

But you must not forget that the heating system is somewhat oversized. It can’t modulate down that far because the sun was really blazing in yesterday.

As you may know, I have integrated a buffer and activated the ERR. On Friday, I increased the heating curve of the heat pump (to load the buffer) by 5K and reactivated the mixer. The heating curves from the heat pump to the mixer therefore differ by +5K. The heat pump basically runs continuously and only interrupts because of the defrost process and the utility grid lockout. The shut-off return temperature is never reached, although the ERR has been opening and closing actively due to the sunny weather inside the rooms. The heat pump modulates wonderfully and my electricity consumption was 40 kWh on Saturday at -9°C including 2x hot water. I'm curious if it will work just as well at milder temperatures...

Total household consumption yesterday: 30.2 kWh

- Lots of hot water, heating only 1 heating cycle again
- Oven on for 4 hours
- Car charged for 30 km
- Dishwasher
- Washing machine

From tomorrow we will finally be above 0 degrees, so the snow will melt, the photovoltaic system will produce electricity, and the storage will be fully charged. Then the misery with full consumption will finally come to an end.