ᐅ Air-to-water heat pump – smart thermostat

This is what it looks like... and if anything, only on radiators... definitely not on a low-temperature underfloor heating system... and I assume you’re referring to something like that in the house since you mentioned an air-to-water heat pump...

Forget about it quickly and just have the standard basic parts installed for 10 euros on the wall... you won’t use them again after the initial setup anyway...

Sebastian79 schrieb:
No matter the manufacturer: An ERR thermostat has no place in a modern house...

I wouldn’t agree with that as a general rule. Especially in well-insulated houses with large window areas (solar gain) or a decorative fireplace (which also provides some heat), it can sometimes make sense, as a hydraulic balancing cannot account for these factors. I notice this in our kitchen—when I cook on several burners at once, the room (24sqm (258 sq ft) with the door always open) gets noticeably warmer.

I contacted Vaillant and received the response that Nest and Netatmo do not have the necessary intelligence for the complex air-to-water heat pump system. These controllers are better suited for apartments with gas boilers. As a suitable and "intelligent enough" alternative, the representative mentioned the Vaillant Multimatic 700. I looked into it and, to be honest, I don’t see it as much smarter than the others. In addition, it’s twice as expensive and twice as unattractive :/

@Saruss:

Actually, your examples clearly show the impracticality—and possibly your lack of understanding.

How is such a slow-responding heating system supposed to react to something like your cooking activities? Or to the fireplace? In those cases, you simply open a window, and that’s it—whether with or without a thermostat makes no real difference.

A thermostat cannot lower the temperature inside the house on its own—that only works in the advertising for "smart and connected heating systems."

Sebastian79 schrieb:
@Saruss:

Actually, your examples precisely highlight the pointlessness—and possibly your lack of understanding.

How is such a slow-reacting heating system supposed to respond to something like your cooking activity? Or the fireplace? The straightforward solution is simply to open a window, with or without a thermostat—that makes no difference at all.

A thermostat cannot lower the temperature in the house—that only works in the advertising of "smart and connected heating systems."

Your argument is incorrect. When I cook and the heating circuit shuts off 1–2 times due to the increased temperature, I save energy (compared to just ventilating away the excess heat), and the warmth gets distributed. The indoor temperature doesn’t drop suddenly (it’s only a matter of a few degrees), but I avoid unnecessarily adding extra energy to the house. The situation with windows is much more extreme—half the house might get enough sun to heat (since heating loads are low!), but the north side would still get too cold, for example, in the bathroom. I also recall that especially well-insulated buildings are required to have Energy Efficiency Ratio (EER) certifications according to KfW standards, and I don’t think that’s just for show.

Wrong assumption, you can get rid of that nonsense.

And you save energy if it shuts off the heating circuit because the air was warmed? That’s a foolish assumption—just like thinking you lose a lot of energy by airing out the room quickly. Since air is the worst heat carrier, it is replaced, while the warmed floor and walls remain at their normal temperature.

Besides, your thermostat has a hysteresis, so normally nothing much would happen from cooking. Or is the unit located right next to the stove?

But as I said, shutting off the circuits doesn’t help you at all...