ᐅ Air-to-air heat pump vs. air-to-water heat pump vs. trench ground collector – Differences
Created on: 12 Dec 2019 10:33
N
Neubau2020
Hello,
I am currently trying to decide how the heating energy should be generated.
Here in the forum, I came across the horizontal ground loop collector, which I find very interesting. In conversations with two prefabricated house suppliers, I mentioned that I am considering generating energy with a horizontal ground loop collector. Both times, the response was, "We’ve heard of horizontal ground loop collectors, but never installed one."
One offer included an air-to-water heat pump (Luxhaus KfW55), and the other included an air-to-air heat pump with controlled residential ventilation (Streif Haus KfW40). The house will have two levels, no basement, around 190 m² (2,045 sq ft), on a fairly flat plot with no special features.
I am wondering how the horizontal ground loop collector differs technically and in price from the air-to-water heat pump.
Is the technology inside the house the same, or are there other factors to consider, such as system size and design?
Is the main difference simply that instead of the external unit of the air heat pump, I install the trench and lay the pipes?
What is the price difference?
What about the long-term difference in energy consumption? The air heat pump needs to run continuously on electricity to draw in air—how does it work with geothermal energy from the horizontal ground loop in this regard?
Lastly, a question regarding the air-to-air heat pump:
The sales representative from Streif Haus said that if I wanted to switch from the air-to-air heat pump to an air-to-water heat pump, it would cost about 10,000 euros more. Is that a realistic estimate?
I am currently trying to decide how the heating energy should be generated.
Here in the forum, I came across the horizontal ground loop collector, which I find very interesting. In conversations with two prefabricated house suppliers, I mentioned that I am considering generating energy with a horizontal ground loop collector. Both times, the response was, "We’ve heard of horizontal ground loop collectors, but never installed one."
One offer included an air-to-water heat pump (Luxhaus KfW55), and the other included an air-to-air heat pump with controlled residential ventilation (Streif Haus KfW40). The house will have two levels, no basement, around 190 m² (2,045 sq ft), on a fairly flat plot with no special features.
I am wondering how the horizontal ground loop collector differs technically and in price from the air-to-water heat pump.
Is the technology inside the house the same, or are there other factors to consider, such as system size and design?
Is the main difference simply that instead of the external unit of the air heat pump, I install the trench and lay the pipes?
What is the price difference?
What about the long-term difference in energy consumption? The air heat pump needs to run continuously on electricity to draw in air—how does it work with geothermal energy from the horizontal ground loop in this regard?
Lastly, a question regarding the air-to-air heat pump:
The sales representative from Streif Haus said that if I wanted to switch from the air-to-air heat pump to an air-to-water heat pump, it would cost about 10,000 euros more. Is that a realistic estimate?
DaSch17 schrieb:
I would have roughly estimated it this way (for KfW 55 standard, 185 m² (1990 sq ft) living area) – including ready-to-use installation –:
1.) Air-to-air heat pump: 20,000 - 25,000 EUR
2.) Air-to-water heat pump including underfloor heating and controlled residential ventilation: 35,000 to 40,000 EUR
3.) Ground-source heat pump including underfloor heating, controlled residential ventilation, and drilling: 45,000 to 50,000 EUR Then I adjust from drilling to a trench collector:
1.) Air-to-air heat pump: 20,000 - 25,000 EUR
2.) Air-to-water heat pump including underfloor heating and controlled residential ventilation: 35,000 to 40,000 EUR
3.) Ground-source heat pump including underfloor heating, controlled residential ventilation, and trench collector: 33,000–38,000 EUR
My subsidy for the collector (I think about 4,500 EUR) was roughly 2,000 EUR higher than the total cost of the collector including all materials, excavation equipment, operator, etc. (around 2,500 EUR). Of course, the installation was done by myself; otherwise, the price would balance out. Also, the ground-source heat pump has a longer service life, and the collector lasts for about three lifetimes.
Tego12 schrieb:
If you do the work yourself, you can get a horizontal ground heat exchanger much cheaper... the collector might cost you about €2,500 (including materials, excavator rental, excavator operator) if you do it yourself. Tego12 schrieb:
My subsidy for the collector (I think it was €4,500) was about €2,000 higher than the total costs for the collector including all materials, excavator, excavator operator, etc. (about €2,500). Of course, installation was done by myself. I don’t understand the comparison.
Are you comparing a subsidized brine-water heat pump with a horizontal ground heat exchanger to a non-subsidized air-water heat pump?
Currently, subsidies are only percentage-based. 35% for new construction. This is also possible with an air-water heat pump.
The prices I mentioned do not take any subsidies into account.
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