Experiences with brine heat pump

Well, modulating heat pumps are all well and good, but as long as it’s not cycling 30 times a day, it’s not a big deal at all. That’s what these things are designed for, and not just since yesterday. You can hardly get one smaller than 6kW. With modulating ground-source heat pumps, you always have the problem with the heat source. Everyone throws their hands up and doesn’t want to hear about any warranty when the heat pump really kicks in. They don’t modulate from 1-6kW but, for example, from 2-9kW. The economic efficiency is also questionable, as the modulating ground-source heat pump is found in the higher price range. The so-called Weishaupt (actually a Dimplex) heat pump is a fundamentally solid but simple system. You’ll be adding a few thousand on top to get a modulating model, especially if Nibe is attached.

Regarding ring trench collectors, you could check in HausbauDialog

yes, you can also find company recommendations there

I don't think modulation is necessary. I have a 5.8 KW heat pump, with a heating load calculated at about 5.5 kW (but somewhat less due to the enthalpy heat exchanger of the ventilation system), but that is calculated for -25°C. Most days in winter/spring here are closer to 0°C, which means well under half of the design load. However, I still don't have any issues with cycling – nowadays houses are so well insulated, and the screed has an incredibly high thermal capacity, so the heat pump here under these conditions only cycles about 4-5 times a day. We are now in the 6th year in the house and have very good consumption values. I don't believe a modulating heat pump would be better (annual performance factor > 6).

I would be interested in your annual consumption, we are now approaching the 1 year mark and will end up at around 1,500 kWh electricity (heating+hot water, 4 people).

We are now in the 6th year in the house and have very good consumption values. I do not believe that a modulating heat pump would be better (seasonal performance factor > 6).

Can you say a bit about the setup? Heated area, hot water storage size, hot water temperature, hysteresis, supply temperatures, etc.? Your system seems to be running really excellently! Edit: Ok, one should read page 1 first

I would be interested in your annual consumption, we are now approaching the 1-year mark and will end up at around 1,500kWh of electricity (heating + hot water, 4 people).

So much we need for just hot water in the summer for two people, if I extrapolate it. A wonder how you do it.