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

And it runs without electricity, powered only by air and care?

seat88 schrieb:

I offer 0.0, gas heating...
(remaining words)

Finally, someone who prefers cold showers!

halmi schrieb:

And it runs without electricity, just on air and love?

... and still produces hot water ;-)

nordanney schrieb:

I provide about 1 to 1.2 kWh per day – one shower per day, rarely more than one. I can finally join the conversation now that the heat pump has been running for a while.

OK, we definitely use more hot water, but that is quite a significant difference. What could be the reason for that? We have the hot water temperature set to 50°C (122°F), and I don’t want it any lower.

Bookstar schrieb:

OK, we definitely use more hot water, but that's a significant difference. What could explain that? We have the hot water temperature set to 50 degrees Celsius (122°F), and I don’t want it any lower.

I have no idea why that is. Adding to the difficulty, the heating pipes in my basement are not insulated yet, so consumption will probably decrease over time.
I have a Panasonic 5 kW heat pump and a 500-liter (132-gallon) hot water tank. Temperature is set at 50 degrees Celsius (122°F) – it reheats whenever it drops below 46 degrees Celsius (115°F).

Bookstar schrieb:

We have set the hot water temperature to 50°C (122°F); I don’t want it any lower than that.

At what point does it get too cold for you, and what hysteresis do you use?
We currently have it set at 43°C ± 7°C (109°F ± 13°F), and so far, I’ve never run out of hot water.
Let’s see how it goes in winter, when showers are generally longer and hotter. I might need to adjust it again then.

How have you set up your hot water circulation? This can also be a significant energy consumer.

As winter approaches again, I am experimenting with a few things. I have a 100L (about 26 gallons) parallel storage tank, a mixing valve, and a high-temperature heat pump (HTHP). This is now the second heating season ahead of me.

Since I have been wondering why manufacturers recommend such hydraulic configurations to minimize cycling and increase running time, I reset all settings and the hydraulics back to "factory settings."

Specifically, this means:

Heating curve for underfloor heating:
18°C (64°F) = 22°C (72°F) return temperature
0°C (32°F) = 27°C (81°F) return temperature
-15°C (5°F) = 30°C (86°F) return temperature

Heat pump heating curve set 5K (Kelvin) above the underfloor heating curve:
18°C (64°F) = 27°C (81°F) return temperature
0°C (32°F) = 32°C (90°F) return temperature
-15°C (5°F) = 35°C (95°F) return temperature

The mixing valve is active!
The primary circuit pump (UWP) is set to proportional pressure, with ERR (flow rate control) enabled.
Compressor capacity reduced.

In the last two days, with outdoor temperatures somewhere between 7–11°C (45–52°F), I have had cycle times of about 3 hours, even though the underfloor heating flow rate controlled by the ERR was between 1200 and 600 liters per minute (320–160 gallons per minute).

Last year, cycle times at similar outdoor temperatures were about 25 minutes!