Solar heat pump / what to watch for in the offer (single-family house, new construction, KFW70)

Especially with heat pumps, every setting should be considered three times... so operation via PC etc. is rather uninteresting... because once the system is running properly, you shouldn’t tinker with it anymore...

Hello,

Especially with heat pumps, every setting should be considered three times... so operating them via PC etc. is rather uninteresting... because once the system is running properly, you shouldn’t change anything anymore...

You can’t say that often enough; thank you! However, I would like to extend this to all systems whose settings require a professional.

This, nowadays, unrestrained urge to experiment of potential builders is rarely productive and usually necessitates the professional to come out again; mostly on holidays or weekends

Rhenish greetings

It is possible to integrate useful functions under certain circumstances... but this is rarely done. For example, controlling underfloor heating based on the weather forecast to overcome inertia...

..... The control purely based on outside temperature absolutely cannot manage that....

Correct, therefore nested controls are basically standard today! The outside temperature based control usually represents the rough guideline. Room-specific ERR represent the room-specific, actual conditions. Additional system return temperature monitoring/control influences, for example, the performance output in case of gas condensing boilers and heat pumps when modulating! However, everything requires adequate planning/dimensioning (heating load, room heating loads, heating surfaces, hydraulics)! Whether considering weather forecasts can offset deficits in the fundamentals, I rather doubt!
Best regards.

... so if there are very large glazed areas, control via the weather forecast is an absolute must, as the heating load and thus the room temperature at +5° with wind and rain is greater than at -10° with bright sunshine. A control based purely on the outside temperature absolutely cannot achieve this.

Hello,

I have a somewhat different opinion on this. The self-regulating effect of underfloor heating should not be overestimated, but it does contribute to temperature equalization to some extent, as the heat is transferred somewhat to the "shady" rooms. Secondly, the controlled residential ventilation also helps to balance things out to some degree. And, this is also a prerequisite for targeted planning, shading plays a major role – especially with a lot of glass.

Before I start fiddling here with weather-forecast-based control and some iPhone apps, I simply lower the blinds when there is strong sunlight – or if necessary, controlled by a sensor. We, with a southwest orientation, also have a lot of glass on this side and we simply manage with blinds. Together with the self-regulating effect of underfloor heating and controlled residential ventilation, this works very well.

Best regards