Experiences with brine heat pump

If you have an architect, can’t they just pull one out of their sleeve? The drilling company came from their contacts for us. All other inquiries were similarly priced or significantly more expensive. Why change a known entity then? We knew each other, and the process was smooth.

We do it the same way. He knows all the aforementioned. The heating installer sees the brine heat pump and wants to offer the drilling as well. He can go ahead, but he won’t get the contract for it.

The drillers have their pros and cons as in any other industry. We need 110m; some can’t drill beyond 100m and then offer 2x 65m. That’s obviously more expensive and less efficient. Others are price breakers, but then you don’t really know what you’re getting (basically one-line offers). We are now going with the “quality leader” (one drilling, PE100-RC pipe, calculated brine instead of just throwing in 30%, grouting material 2.4W). The other offers are good as a negotiation basis though.

Regarding the topic of “one contact person.” I consider that unnecessary for brine drilling; the interface between driller and heating guy is clearly definable. Apart from that, my “one contact person” is the architect anyway—the coordination of the trades is his responsibility.

Well, for example, we are not allowed to drill deeper than 100m.

Water protection area and the authority have "closed" it off. So we get 2 x 80. We also have to pour in the "expensive" stuff because of [Wasserschutzgebiet IIIA] (~€600 extra).

Regards
Markus

I can't imagine a borehole costing €5,000.

We had two offers that were between €10,000-12,000 (for 12kW extraction capacity) - but that was in 2009.
Everything was included there, application/request to the water management authority, drilling samples, disposal of flushing sludge, pressure test, backfilling...

Today, a new building has a heating load of 5-6kW. And even that is still exaggerated, because the heating load calculation depicts extremes and, for example, does not consider solar gains.
For a 6kW heating load, you need about 4.6kW extraction capacity...
You were offered nonsense, it's that simple. You have to kick people so they actually calculate instead of just blindly offering something. Although the drillers are decent, all of them looked up the extraction capacity on site in the geo NRW maps instead of just estimating roughly. But you can forget the heating engineers; they all design too big (and the probe correspondingly too deep).

Well, for example, we are not allowed to drill deeper than 100m.

Water protection area and the authority has "sealed" it. So we get 2 x 80. We also have to pour in the "expensive" stuff because of water protection area IIIA (~€600 extra).

Regards Markus

that's just how it is. location, after all. it was the same with the Räuber, he also had a thread about it

The drilling itself is not that expensive for me. The surcharge for the water protection stuff alone is 600€ net. They also charge for the connection to the house including the wall breakthrough (including the Doyma seal) (here I will have the excavation done by my deep construction contractor).

Edit: It also always depends on what is included (probe trench for the house entry, house entry itself...). Additional protection for the probe may be required in my case. That then costs an extra charge from 13 meters depth. We'll see.

Regards Markus

Yes, that's what I mean, what's inside. The drilling alone doesn't help, it also has to be connected, and just for that you can charge 3,000 euros. Then drilling with VAT is just under 10,000, plus other things (distribution shaft), and you're back at the dreaded 15,000 euros.

Those who drilled so cheaply here, could someone from you post an offer? I just don't believe it, sorry..