Experiences with brine heat pump

Where do you all live or do you have to drill through obsidian? Our 100 drilling meters cost around 5000 euros.

Can you tell me which provider you had the drilling done by? Feel free to send a PM if you’re not allowed to mention it here? Or the others?

I got 2 quotes, one from ***Geotherm and one from Bau***** Süd, and ended up with 14,000 and 18,000 (but that was the all-inclusive package)

The first one included:

Drilling and expansion work
Horizontal connection to the building
Distribution shaft
Wall penetration including core drilling

Additionally, there would be an expert report costing around 1000 euros.

I think it's cool, Tego, especially if you trust yourself to do it. But for the masses, your solution will be hard to realize, the heating installer also has to cooperate, many will probably refuse, I think. How was it for you?

As you say, it’s not a mass solution. It was my only own contribution to the house; you often want to do something yourself anyway. The 4 days were, besides the job, also quite manageable and absolutely manageable.

We built with a general contractor, so we couldn’t really choose our heating installer. But we were lucky: We made a clear agreement that I do everything up to and including the manifold (the costs include a finished insulated manifold, I only had to screw it to the wall and attach the 4 brine ends... it was a bit fiddly, but it didn’t take longer than 3 hours), the heating installer takes over from the manifold and takes care of everything including pressure testing, etc. For him, it’s exactly the same as if he connects to a borehole... At first he was skeptical, but that has since subsided... (annual performance factor >5).

Regarding the house entrance... why exactly should that be so expensive? I don't know much about drilling there now, but with the trench collector: simply put the 4 brine ends into KG pipe (2 per pipe) through the floor slab (or wall in the basement) into the house. Water pressure tight Doyma seals make everything tight (they only cost about €120 each, so a total of €240). Everything was laid before the floor slab was there... definitely much more complicated afterward.

In the purple forum, however, you now read in the southern region of Germany and Austria about a lot of companies that offer the trench collector as a package... for costs far below drilling. Then you don't need any knowledge at all, you just need a mostly undeveloped plot... In an existing garden, I wouldn’t want to do it.

@Tego: that really sounds good, back then I didn't get any offers anywhere and only knew the drillings... seems to be a really cheaper alternative. : your drilling prices are even higher than the ones I mentioned. Which report do you mean with 1000 euros?

We also have a ground source heat pump with a surface collector (7 loops of 80m each).
Planned and executed by ourselves. We simply did it over two evenings in between, while the excavator was already on site. No rocket science, quite the opposite.
You just need the space in the garden. We needed about 350m² for it.

The most complex part was the shaft for the manifold. We built it solidly and planned it quite large (2x1.5m) because we knew it would be very fiddly to connect the 14 brine ends to the manifold. The PE pipes are very stiff, after all.

Costs: Since everything was done completely in-house (my partner’s brother trained with a sanitary/heating company) and with BAFA funding, the ground source heat pump cost us only minimally more than an air-water heat pump (about €2000).
The annual performance factor is currently 4.7 (heat quantity meter available, according to the ground source heat pump itself, the annual performance factor is well above 5).

We were very curious to see if you could "see" where the surface collectors lie in the garden in the first winter. One often reads that the snow melts later there, etc. => At least in our case, this was not the case. And we had a lot of snow this year to observe it.

Two couples of friends are also spending their first winter in their new house and have an air-water heat pump. For both, the electric heating rod already turned on very often all day this winter, because we had temperatures of -10 degrees during the day (colder at night) over an extended period.

We also have a geothermal heat pump with a surface collector (7 circuits of 80m each).
Planned and executed by ourselves. We just did it in between on 2 evenings, while the excavator was on site anyway. No rocket science, quite the opposite.
You just need the space in the garden. We required about 350m² for it.

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Hats off that you did it yourself, but I wouldn’t dare to do that now....

Therefore, apples and apple prices should be compared.

: In our municipality, a water law assessment is required before you start drilling.

So, does anyone know companies that offer drilling or collectors in a package and are cheaper?

Hats off to you for doing it yourself, but I wouldn’t dare try that now....

Therefore, apples and apple prices should be compared.

: in our community, a water law expert opinion is required before you start drilling there

So does anyone have companies that offer drilling or collectors in a package and are cheaper?

An affordable drilling company was once mentioned in the newspaper here.

My brother drilled with the provider – and had no problems at all. He had offers ranging from €8,000 to €16,000. The drilling was about 2*80 meters.

Who is at fault in such accidents is always hard to say. But if you live in an area with anhydrite layers, I would keep my distance from such drilling. Even if, according to the state of the art, nothing should happen