ᐅ Experiences with Groundwater Heat Pumps?

Hello everyone,

Has anyone installed or obtained approval for a groundwater heat pump? Are there any experiences with this technology? Can you provide any recommendations? It was just suggested to me as an alternative to a propane tank / natural gas / air-to-water heat pump.

Thank you very much for your responses!

Best regards,

Leon

Hello,

Leon schrieb:
...has anyone installed or received approval for a groundwater heat pump? Are there any experiences so far? Can any recommendations be given? It was just suggested to me as an alternative to liquid gas tank / natural gas / air-to-water heat pump.

Only wood, pellets, and oil are missing ;-)
With a warm water heat pump, if the conditions are right, it is usually possible to achieve a higher seasonal performance factor compared to, for example, a brine heat pump, since the source temperature is higher. This is despite the higher energy consumption of the source pump.
However, it particularly depends on the water quality and the capacity of the production well (subsoil, groundwater level). Well-suited locations include, for example, river plains. Here, too, approval from the local water authority is required. If sufficient water quality is not ensured, production and/or injection wells tend to suffer from issues such as iron deposits relatively early. Then the situation looks rather problematic.
In general, heat pumps require specific conditions that must be guaranteed. Without adequate or any planning, the project can quickly become a money pit.

The higher the actual demand (power, energy) for heating and hot water, the more important a high seasonal performance factor becomes (moderately to well-insulated buildings, cold climate locations). For very well-insulated buildings and mild locations, the considerable effort of source development can often be avoided by opting for an air-source heat pump instead.
Natural gas is also an option; however, the consumption (kWh) is higher than the demand, while with a heat pump it is the other way around. Condensing gas boilers are usually inexpensive to purchase, but one must not forget the sometimes significant connection costs.
Liquid gas is not necessarily a favorite because the fuel price can be significantly higher compared to, for example, natural gas. Also, very low minimum modulation values (minimum output) are often not achievable.

Best regards

Not that I understood much of it... but thanks anyway for the detailed text. From what I could gather, without optimal conditions I would have to pay quite a bit, which (in my opinion) implies that I am better off with an air-source heat pump, solar panels for water heating, and a wood stove.

Leon schrieb:
..., which in my opinion implies that I am better off with an air-source heat pump + solar for water heating + wood stove.

This is an ideal scenario that does not automatically prove to be cost-effective. A combination of weekends with partially competing requirements rarely results in a sensible system efficiency ratio. The additional investment or financing cost usually has a less favorable relationship to the benefits. In many cases, the concept is not even effectively managed over a weekend, let alone a mix of various components. Technically, almost everything can be connected, but unfortunately this often does not make much sense.

Best regards

Okay, so what should I do now? Does my architect calculate the energy demand and thus determine the most cost-effective heating method? Or should an energy consultant be involved? On a different note and with honesty: Is anything really more cost-effective than KfW 70? I mean, sure, it's better for the environment and all, but can that actually be measured in numbers with a connected payback of the costs over the next 20-30 years? Thanks for your answers!

Leon schrieb:
Okay, so what should I do now? Will my architect calculate the energy demand and thus determine the most cost-effective heating system? Or should an energy consultant be consulted?

Neither option is likely to be effective. Neither architects nor energy consultants typically have training in building services engineering (HVAC). These gaps have been partially recognized. Some universities of applied sciences have started expanding their civil engineering programs to include building services engineering, at least to some extent and covering the basics. How this will translate into practical results remains to be seen.
If you want to be certain, it is best to involve a specialist who is familiar with small-scale systems and combines experience as a building services engineer, energy consultant, and, for example, civil engineer.
If you have questions, feel free to contact me by email or private message.

Leon schrieb:
...Something else, and honestly: Is anything more economical than KfW 70 at all?

This is a very valid question but difficult to answer reliably without specific project data.
The fact is, many people chase so-called “grants” without fully understanding them ;-) What is often overlooked: Who actually gives something away? ;-)
Subsidies come with conditions that initially require higher investments (capital requirements for this) ;-) Often, the consumption costs that look good on paper are not actually achieved! That’s unfortunate, considering the significant upfront investments made! Theoretically “calculated” certificates, such as KfW proofs, are not a guarantee of economic viability for the individual operator.
As I also work as an appraiser, I could write a book about disappointed homeowners ;-)

Leon schrieb:
...So clearly, for the green conscience...

That usually only becomes obvious afterwards, when your own economic viability has more or less failed ;-)

Best regards