Company Lüumel, trench collector

Now my initial questions have led me to a completely different but certainly important topic, electricity tariffs. Luckily, my house is not scheduled to be built until March, so I still have some time to deal with it. As a saver, I probably have to.

I guess you keep a pretty exact record of your consumption, how would you estimate the ratio of low to high tariff with a heat pump (LT 10:00 pm to 6:00 am)? Do you think the following blocking times could be problematic? (currently renting, 2 people, recently had a baby, so hardly any experience with such values)

"all devices are subject to the following blocking times daily:
8:00 am to 9:00 am
10:30 am to 12:00 pm
5:30 pm to 7:00 pm"

The idea from Sebastian79 with an intermediate meter would at least be a cost-effective alternative. On the internet, I found significantly cheaper heat meters (around €150). So for the purpose of recording and evaluation, you could certainly set up something for around €300.

Phew... you ask questions. I have set up my heat pump independently of lockdown periods or any tariffs. Of course, I have adapted it to our personal routines. Generally, I have my domestic hot water times during the lockdown periods (early morning and evening) or shortly before, that you posted. Whether that is the same for you, no idea. It certainly depends on how long you shower, whether you take a lot of baths, whether it is always at the same time, when you go to work, etc. The two of us mainly shower (usually one in the morning, one in the evening) and only our little one is occasionally in the bathtub. From that point of view, I can currently narrow down our domestic hot water heating times very much. I think I have reduced the domestic hot water heating times on weekdays to under 1 hour per day. Normally, it is probably more like 2-3 hours. During the domestic hot water times, domestic hot water heating has priority, and the heating circuits are not supplied. Therefore, the domestic hot water times should be as short as possible. If you now heat domestic hot water from 4:30 pm to 5:30 pm, for example, this means you have no heating from 4:30 pm to 7:00 pm including the lockdown period. That is not nice, but in an insulated house with underfloor heating, it is not dramatic either. However, if you need a lot of hot water between 5:30 pm and 7:00 pm, the heating of course cannot produce any new heating, and you will have cold water in the bathtub. However, I once read here in the forum that the lockdown periods only apply in exceptional situations and that this has never happened before. Whether that is really the case or varies from provider to provider, I have no idea. Since our heating runs continuously, and I have not programmed different temperature curves for day and night, the (heating) electricity consumption should be relatively constant throughout the day. In summer, of course, only for the domestic hot water times. But I always only record in the evening, so I cannot analyze consumption between 10 pm and 6 am and between 6 am and 10 pm based on my figures. Theoretically, however, you could heat more between 10 pm and 6 am than necessary and then heat less during the day. Whether that really saves money certainly depends on the difference between HT and NT.

@Musketier:
Can the ground uplift/subsidence of 20-30cm (really in this magnitude?) be explained solely by ground freezing? That would be a glaring + fundamental technical system flaw? How do the manufacturers comment on this, or how should this construction-related issue be resolved damage-free by the manufacturer?

Is the thing with the blackout periods really still being enforced in Germany? It only works if you have two electricity meters anyway - I'm calculating it right now, but I can't quite see that it really pays off. Especially in the first 2 years there are still fluctuations... that's why I only planned the second meter for space reasons, but for now I'll just take a tariff for general electricity.

As written above, the company found that there is not enough refrigerant. Therefore, the heat pump draws all its energy only from the first part of the loops, as the state of the refrigerant is already changing there. With an originally filled 5.7kg of refrigerant, about 1kg was added. Whether this actually helps, we will see this winter. Otherwise, there will be another defect report, as then a planning error is likely.

Is the trench collector from Lüumel also a direct evaporator or brine collector? You really can't compare them properly and thus not the experience values from Musketier - which rather read as alarming...