ᐅ Additional Cost for Ground-Source Heat Pump Ground-Source Heat Pump Compared to Gas Condensing Boiler with Solar Integration

Good evening everyone,

Our project is gradually taking shape, and now the budget needs to become more precise. At the moment, I have three quotes: one from a solid house manufacturer, one from a general contractor, and one from a construction company/general contractor. All of them include a gas condensing boiler with solar support in the scope of work. To realistically estimate the additional cost, I am looking for experiences on how much extra I should expect to pay for a ground source heat pump with borehole drilling before deducting any government subsidies.

Does anyone have any experience with this?

Thank you very much!!

It depends.

For example, how much your contractors have estimated for the gas condensing boiler, whether the gas connection will actually be installed, and whether the underfloor heating system is designed for low flow temperatures even with a gas condensing boiler, which might avoid additional adjustments.

Then factors like ground conditions, the heating load, and many others significantly influence how much more expensive a brine-to-water heat pump would be.

Last but not least, the general willingness of the construction company to install one at all also plays a role.

The search function provides quite good guidance.

I would ask the three suppliers specifically for this item! We inquired about the costs of every possible item and were thus able to calculate our total house costs quite well using a modular approach. Most suppliers work with flat rates from a list 🙂

Thank you! I have also noticed the flat rates. It’s probably unmanageable for the providers otherwise, as the quote acceptance rate is likely no higher than 50%. For this reason, you have to choose a provider at some point. I was hoping someone would just say 10,000 and that would be that.

Ground-source heat pump drilling ~ €7,000–10,000 (depending on kW offer, etc.)
Heating system ~ €8,000–9,000
Bafa subsidy - €4,500

Gas condensing boiler ~ €2,000–4,000 (?)
Gas connection ~ €2,500
Solar system ~ €2,000 (?)

So roughly €15,000–16,000 for the ground-source heat pump if the Bafa subsidy is approved, and about €8,000 for gas. Very rough estimates—please correct me.

Great, those are good reference points!