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.
BeHaElJa schrieb:
570 € is quite affordable – of course, it depends on your ground conditions Lexmaul79 schrieb:
I assume that’s just for the drilling – there are quite a few additional costs on top of that All in, we paid 7,126 euros for the entire drilling – for a 7.8 kW system.
This included site setup including transport of equipment to and from the site, drilling, backfilling, 95 l (3.3 gallons) of brine filling, container plus removal of the excavation material, compression ring seal, connection of the double U-pipe probe, and shut-off device for the supply line. All works related to the drilling were covered by this.
No idea if this was cheap or expensive. It was the company our general contractor recommended based on good previous experience. From our perspective, they did a good job.
Lexmaul79 schrieb:
I'm just surprised because every type of ground offers different extraction capacity – also depends on how many boreholes are made.
We are aiming for just one borehole and are currently assuming 140 m (460 feet), but we still need to wait for the heating load calculation.
With the BAFA bonus, a brine borehole really makes sense now. .I'm not entirely sure – but for us, 120 m (390 feet) was once mentioned.
BAFA subsidy?
I believe it is either a new scheme from 2015, relates to subsidies for existing buildings, or is regionally limited (NRW – although I doubt that if it comes from BAFA).
Since April 1, 2015, new buildings are also eligible for a subsidy of €4500 for installing particularly efficient brine-water heat pumps (annual performance factor > 4.5) or those with a higher system efficiency (no exact definition available – this information is missing on the BAFA website). The problem is often that certain systems are not listed on the BAFA approved list because, for example, they are too new.
S
Sebastian7912 Apr 2015 12:46Give us an update – although in the end, only something in writing from them really matters to me. It’s about a lot of money...
Pump manufacturer: the new pump will be available in June and certified in August.
Bafa: yes! BUT – you can submit the application with a note stating that the certificate will be provided later. Payment will, of course, only be made afterward. Additionally, they emphasized a few other points: the well driller must be WS120-2 certified and have insurance coverage against drilling damage without a deductible. Otherwise, the usual requirements apply.
We are starting to wonder whether it is wise to install such a brand-new device. As is well known, early problems tend to occur more frequently with mechanical engineers.
Bafa: yes! BUT – you can submit the application with a note stating that the certificate will be provided later. Payment will, of course, only be made afterward. Additionally, they emphasized a few other points: the well driller must be WS120-2 certified and have insurance coverage against drilling damage without a deductible. Otherwise, the usual requirements apply.
We are starting to wonder whether it is wise to install such a brand-new device. As is well known, early problems tend to occur more frequently with mechanical engineers.