Planning/Preparation of a deep drilling

mea culpa: Innovation promotion is possible both in new construction and in existing buildings. Please note that the application must be submitted before the start of the project. The start of the project is defined as the conclusion of a delivery/performance contract as well as the awarding of the contract in relation to the applied heat pump. Die Erschließung der Wärmequelle gehört nicht zum Vorhabensbeginn.

Thank you very much for the quick and comprehensive answers, including regarding funding.

Although I did not find a database for the deep boreholes, I did find official maps for geothermal energy (in the "target area" the map indicates a withdrawal capacity of 55-57.5W/m).

That is indeed already good. For us, for example, it is only 39 W/m.

That is indeed quite good. For us, it is only 39 W/m, for example.

This thread by FloLiX prompted me to look into the direction of a geothermal system for our construction project.

"Good heat pump heating systems with ground heat probes (brine/water heat pump) as a heat source cost only slightly more in new builds for average-sized single-family homes than an air heat pump.

The annual operating costs of brine/water heat pumps are significantly lower compared to an air/water heat pump."

I have an offer (allegedly market leader; gross: € 6,664) with a theoretical (non-binding) preliminary examination and an extraction capacity of approx.: 55 W/m .
Hot water preparation: according to Energy Saving Ordinance 2009!

This should be known to a "market leader" => The Energy Saving Ordinance 2014 replaces its predecessor ordinances from 2002, 2004, 2007, and 2009.



Drilling: € 5,712
Connection work: € 982

How should this offer be evaluated?
Are there users in this forum with current new geothermal systems, who would like to report on their experiences?

2009 and 2014 do not differ there - therefore it does not matter and it is often done that way. I know the provider - he was still a good notch above the one we have now. You have to look at all the contingency items, there is still a big surcharge...

Official links, e.g. from KfW-Bank, Geological Service NRW, etc., should generally be allowed.
A added value would be provided for many readers. If not desired, I will refrain from these activities here in the forum!