Groundwater as a geothermal energy source

Hello everyone!

Today, through an acquaintance, I became aware of this interesting heating technology! Since in our town (where I will build my house next year - land available) there is a high groundwater level, his brother built his house 5 years ago with exactly this heating technology. Namely at a depth of ~7 meters and an average temperature of 15°C! Until now, deep drilling (70 - 100 m) and surface collectors have always been familiar to me, but I had never heard or read about a variant that uses groundwater until now! How come? Is it too unprofitable (cost-benefit compared to other heating technologies), too expensive, too unknown? At first glance, it sounds very interesting to me and for my property (400 sqm)! What do you know about this heating technology?

Cheers!

That you will probably not be allowed to do that. And if you are, then with regular proof that you do not contaminate the groundwater.... and the costs.

Our heating engineer also has the system listed on his website. Quote: Water is drawn from a well by a feed pump and made available to the house heating (domestic hot water, comfort underfloor heating) through the heat pump, to then be returned in a cooled state to the injection well.

Exactly, draw and swallow wells. However, you need a special permit, and the system is not cheap.

In addition, the wells can silt up – you do not acquire a worry-free package with it, although it is very efficient.

That is something you probably won't be allowed to do. And if you are, it will come with regular proof that you are not contaminating the groundwater... and the costs.

What kind of nonsense is that? Seriously, if you have no idea, then please be quiet.

Groundwater heat pumps are common practice; I have one myself and am very satisfied. Nothing gets contaminated, nor do I have to provide any proof. The only requirement is the permit from the mining authority, which the well driller takes care of.

Two wells are drilled, in my case 4-12m deep, one is a suction well and the other a discharge well. Water is drawn in, energy is extracted through a heat exchanger to supply the heat pump. Instead of air, there is only water here, which then flows back into the well.

Presumably BeHaElJa was thinking of drinking water. That would of course not be allowed; drilling is only permitted up to the first water-retaining layer.

Whether this is feasible for your property you have to clarify with an executing company, they look at the GW plans (GW status and flow direction) and conduct test drillings with pumping trials to see if it is worthwhile for you.