ᐅ Trench Collector Ground Source Heat Pump or Air Source Heat Pump?
Created on: 1 Mar 2015 10:25
L
Legurit
Hello everyone,
We had our first meeting with the builder yesterday. He quickly dismissed the heating topic since there is no gas connection but gave us some contact addresses.
The house has roughly 190 m² (2,045 sq ft) of living space and a heating demand of 6,600 kWh/year, or about 6 kW heating load.
So far, we have planned to install a ground-source heat pump with a horizontal collector, but the builder rightly pointed out that he would prefer some maneuvering space around the house. In the pink forum, there is a community advocating for DIY horizontal collectors, saying that the trenches including materials could be done for around €2,000. Including the heat pump gross price of €10,000, that would be €12,000 total. An air-source heat pump would cost at least that much for the unit alone.
Unfortunately, we are already a bit overwhelmed with the house planning and are not sure if we would trust ourselves to do the DIY installation. Does anyone have experience with the costs when contracting out the trenching and pipe laying?
As for consumption, we found a factor of about 1.5. So the air-source heat pump would be around 50% more expensive to operate than the ground-source heat pump, but we wouldn’t have to dig (in absolute terms, about €180 per year). We are also unsure whether having a photovoltaic system would be beneficial or not (we are skeptical).
Thanks for your experiences and advice.
We had our first meeting with the builder yesterday. He quickly dismissed the heating topic since there is no gas connection but gave us some contact addresses.
The house has roughly 190 m² (2,045 sq ft) of living space and a heating demand of 6,600 kWh/year, or about 6 kW heating load.
So far, we have planned to install a ground-source heat pump with a horizontal collector, but the builder rightly pointed out that he would prefer some maneuvering space around the house. In the pink forum, there is a community advocating for DIY horizontal collectors, saying that the trenches including materials could be done for around €2,000. Including the heat pump gross price of €10,000, that would be €12,000 total. An air-source heat pump would cost at least that much for the unit alone.
Unfortunately, we are already a bit overwhelmed with the house planning and are not sure if we would trust ourselves to do the DIY installation. Does anyone have experience with the costs when contracting out the trenching and pipe laying?
As for consumption, we found a factor of about 1.5. So the air-source heat pump would be around 50% more expensive to operate than the ground-source heat pump, but we wouldn’t have to dig (in absolute terms, about €180 per year). We are also unsure whether having a photovoltaic system would be beneficial or not (we are skeptical).
Thanks for your experiences and advice.
B
bratwurst11 Apr 2015 10:33oleda222 schrieb:
We are starting to install the collector on Thursday. I will report back on how time-consuming it was.So, are there any updates yet?
BeHaElJa schrieb:
We are now leaning again towards a ground-source heat pump – we have requested 3 quotes and I’m curious to see the results. One well driller quoted €875 net per kW, which means about €80,000 for us – just for the drilling and probe.Lexmaul79 schrieb:
Per kW? Drilling meters are usually charged, aren’t they...?@Lexmaul79
Our drilling company also based the invoice on 7.80 kW. It is clear that this corresponds to a certain number of drilling meters in the end.
@BeHa
We were quoted €570 plus VAT per kW.
S
Sebastian7911 Apr 2015 14:08I'm just surprised because every ground type offers different heat extraction capacity – also depends on how many boreholes are needed.
We are aiming for only one borehole and are currently planning for 140 m (460 feet), but still need to wait for the heating load calculation.
With the BAFA subsidy, a brine borehole really is worthwhile now.
We are aiming for only one borehole and are currently planning for 140 m (460 feet), but still need to wait for the heating load calculation.
With the BAFA subsidy, a brine borehole really is worthwhile now.
S
Sebastian7911 Apr 2015 14:18I assume this is only for the drilling – there will be additional ancillary costs.
bratwurst schrieb:
So, any insights yet?The topic is a bit complex to fully explain here without links, so if you’re interested, you might want to look for information in another specialized forum—it should be quite easy to find.
Overall, it went better than expected. Whether it actually works, I’ll know once the house is built. However, the feedback from other trench diggers is so positive that I’m optimistic it will work out for me as well.