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

Alessandro schrieb:

I can understand the need to check it. I also visit the heating system at least five times a day.
My wife is even more annoyed by this than I am 🙄
Apart from the faulty sensor, the system is actually performing very well in terms of consumption, @Zaba12!

Here is my current status update:
In the past few days (always around freezing point), I had a daily consumption of 20–28 kWh including domestic hot water.
COP always between 4.0 and 4.6
SPF currently at 4.3

But here’s the thing! My heating curve is terribly high:

18°C (64°F) = 30°C (86°F) flow temperature
0°C (32°F) = 35°C (95°F) flow temperature
-15°C (5°F) = 38°C (100°F) flow temperature

This is really not what you would expect from a new build, but your hydraulic system probably can’t do better. Considering the heating curve, the consumption is still moderate...

OWLer schrieb:

We already discussed this topic in your thread, didn’t we? Your bathroom has too short a pipe spacing, and with the high-temperature heat pump (HTHP), there is a risk that the heat pump will start cycling again because the return flow rises too quickly and strongly due to the short heating circuit.

Wasn’t the general consensus that you could significantly lower the supply temperature if you make the bathroom cooler or use an electric high-temperature heat pump?

No, we didn’t.
The HTHP has its own heating circuit.
My idea now was to connect the HTHP in series (on the return flow) to the bathroom heating circuit, so that it would at least still provide some heat.

Daniel-Sp schrieb:

This is really unworthy of a new build, but it seems your hydraulics can’t do more. For the heating curve, the consumption is still moderate...

I’m willing to accept that for a warm bath 😉

What bothers me more at the moment than the heat pump is the humidity in the bathroom. After showering, I have to ventilate enough for the temperature to drop by 2°C (3.6°F) and for the relative humidity to stay below 60%.

I hope this really is due to the residual moisture in the new build. It has definitely improved a bit so far.

Alessandro schrieb:

I’m willing to accept that for a warm bath 😉
What bothers me more right now than the heat pump is the humidity in the bathroom. After showering, I have to ventilate so that the temperature drops by 2°C (3.6°F) and the relative humidity stays below 60%.
I hope this is really due to the residual moisture from the new build. It has definitely improved a bit already.

No mechanical ventilation system (or other ventilation concept)?

Nope, my wife didn’t want that at first.
Now she would like to have either a central or decentralized ventilation system for the bedrooms and bathrooms! 😡 🙄
The problem, as always, is that everything is already finished! I don’t have a suspended ceiling. For a decentralized ventilation system, the electrical wiring is missing, and a central system for the entire upper floor only makes sense in the attic.
However, since I have a cold roof, that will be difficult. I don’t know of any mechanical ventilation system with heat recovery that can operate at such low ambient temperatures...

That said, the air quality is almost perfect everywhere, and technically a mechanical ventilation system wouldn’t be necessary.
Except for the humidity in the bathroom, I don’t see any reason for it.

Alessandro schrieb:

However, since I have an unventilated cold roof, that will be difficult. I am not aware of any controlled residential ventilation systems that can operate at such low ambient temperatures...

In our case, it will be insulated and fully enclosed.