ᐅ Comparison of Geothermal Heat Pump and Air-to-Water Heat Pump
Created on: 8 Aug 2020 22:33
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mjammjammjam
Starting point: In the builder’s cost estimate, an air-to-water heat pump Nibe F2040 with a 180-liter (48-gallon) hot water tank is listed. Additionally, there are electric towel radiators and appropriate insulation to meet KfW-40 house standards. This package is supposed to cost us €13,900.
After some research, I found out that ground source heat pumps have a higher annual performance factor. According to the builder’s catalog, the air-to-water heat pump has a COP of 3.6, while the ground source heat pump has at least 4.5. In this case, it is a Nibe 1255.
Even though I don’t yet know the potential price for the 1255 from the builder, I would like to ask,
I look forward to your answers, as a non-expert I feel a bit lost here (at least I do right now)...
After some research, I found out that ground source heat pumps have a higher annual performance factor. According to the builder’s catalog, the air-to-water heat pump has a COP of 3.6, while the ground source heat pump has at least 4.5. In this case, it is a Nibe 1255.
Even though I don’t yet know the potential price for the 1255 from the builder, I would like to ask,
- what you paid for any borehole drilling for the ground loops?
- how the running costs compare between air-to-water and ground source heat pumps
- what you had to pay for your eligible Nibe units
I look forward to your answers, as a non-expert I feel a bit lost here (at least I do right now)...
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mjammjammjam9 Aug 2020 14:35At the moment, I am having great difficulty estimating the financial effort required for these trench collectors.
Ötzi Ötztaler schrieb:
That is incorrect. Almost every manufacturer now offers an air-to-water heat pump with an annual performance factor (seasonal COP) of 4.5 or higher in most climate zones. Nibe, Wolf, Viessmann, Alpha Innotec/Novelan, and so on. That surprises me. I have a Novelan, a modulating unit, very new and efficient, but according to the manufacturer's specifications it does not reach 4.5. Where is the mistake?
Joedreck schrieb:
Because he had bad experiences.
A ground-source water heat pump can be affordable if you install the source yourself using a trench collector. I wouldn’t say bad experiences. It’s simply uneconomical unless you do the installation yourself. I’ve also learned that gas systems don’t always require collectors. For wooden houses, apparently, they are not needed, and then gas is unbeatable in cost.
Even so, you can save quite a bit of money and rely on very dependable technology. Unfortunately, heat pumps are still somewhat behind in this regard.
With gas, you don’t have to worry about legionella, the water is always boiling hot, and if the supply temperature needs to be a few degrees higher, that’s no problem at all.
With a heat pump—good luck!
mjammjammjam schrieb:
At the moment, I’m having a hard time estimating the financial effort required for these trench collectors.This also requires thorough planning and obtaining quotations. So it depends heavily on your specific situation. Therefore, it is very individual and not suitable for everyone.Bookstar schrieb:
I wouldn’t say I had bad experiences. It’s just not cost-effective if you don’t install it yourself. I also learned that gas isn’t always required with solar collectors. With wooden houses, they’re apparently not necessary, and then gas is unbeatable in terms of cost.
But even so, it saves a good amount of money and uses very reliable technology. Heat pumps are unfortunately still somewhat behind in that regard.
With gas, you also don’t have the issue of legionella, you always get boiling hot water, and if the supply temperature needs to be a few degrees higher, that’s no problem at all.
With heat pumps, good luck! Saying that heat pumps are unreliable is simply not true. Legionella is only an issue with heat pumps in cases of severe planning errors.
Where you are 100% right: gas is more fault-tolerant.
Ötzi Ötztaler9 Aug 2020 17:03
Bookstar schrieb:
I have a Novelan, a modulating unit, very new and efficient, but it doesn’t reach the 4.5 coefficient of performance according to the manufacturer’s specifications. What could be the problem? Your unit probably doesn’t use R290 as the refrigerant. Try searching for Novelan LADV or Alpha Innotec LWDV. I didn’t say that “every current modulating unit reaches 4.5,” but nowadays you can find at least one specific model from nearly every major manufacturer. Often these are unfortunately in a higher capacity range, but for example, Nibe also offers suitable options for average-sized houses.
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