Hello,
We were quite certain that we wanted an air-to-water heat pump, but now we are considering whether a geothermal heating system might be the better option. This would cost us 2,500€ more for the permits and drilling. Is the additional 2,500€ really worth it?
Does anyone have advice that could help us with this decision?
We have also heard that geothermal systems are significantly more efficient than air-to-water heat pumps.
We would be very grateful for your tips and information.
Regards
We were quite certain that we wanted an air-to-water heat pump, but now we are considering whether a geothermal heating system might be the better option. This would cost us 2,500€ more for the permits and drilling. Is the additional 2,500€ really worth it?
Does anyone have advice that could help us with this decision?
We have also heard that geothermal systems are significantly more efficient than air-to-water heat pumps.
We would be very grateful for your tips and information.
Regards
We are currently facing this difficult decision as well. We plan to build in summer 2012 and here are some key details about the house:
Solid construction using 30cm (12 inches) Poroton bricks + 10cm (4 inches) external thermal insulation composite system (ETICS) with polystyrene
Approximately 135sqm (1450 sq ft) living area
Triple glazing
Decentralized ventilation system Schiedel AERA Comfort (without heat recovery, since we are not convinced by it; we do not want fresh air supplied through a duct system but aim to minimize heat loss from ventilation)
Roof structure with 20cm (8 inches) insulation between rafters
BRAAS roof tiles
Basement constructed as a waterproof “white tank” with 30cm (12 inches) concrete + 10cm (4 inches) perimeter insulation, floor insulation in the basement screed
Large window area facing south, with dormer windows facing north as well
Designed for 2 adults and 2-3 children
Now here are my thoughts on the heating system:
We definitely want a heat pump (so please don’t try to convince us otherwise).
a) Ground-source heat pump (Alpha Innotec) with borehole drilling (about 80m (260 ft) depth possible with 45W/m efficiency, clay subsoil)
b) Air-to-water heat pump with COP >3.5 (Alpha Innotec) in mono-variant operation
Possibly a traditional tile stove in the living-dining area as additional support during the transitional seasons.
Climatically speaking, our location is not really favorable, with rather moderate to lower average temperatures compared to climatically advantaged regions, such as southern Germany.
I am interested in what would make the most sense energy-wise, regardless of investment costs. Of course, investment costs are also important; naturally, the air-to-water heat pump alone would be the cheapest option – but would that be economical for our planned house?
We would like to achieve KfW 70 standard, which should be feasible. Do you see any chances to reach KfW 55? What would be needed for that?
Thank you very much in advance for your help!
Solid construction using 30cm (12 inches) Poroton bricks + 10cm (4 inches) external thermal insulation composite system (ETICS) with polystyrene
Approximately 135sqm (1450 sq ft) living area
Triple glazing
Decentralized ventilation system Schiedel AERA Comfort (without heat recovery, since we are not convinced by it; we do not want fresh air supplied through a duct system but aim to minimize heat loss from ventilation)
Roof structure with 20cm (8 inches) insulation between rafters
BRAAS roof tiles
Basement constructed as a waterproof “white tank” with 30cm (12 inches) concrete + 10cm (4 inches) perimeter insulation, floor insulation in the basement screed
Large window area facing south, with dormer windows facing north as well
Designed for 2 adults and 2-3 children
Now here are my thoughts on the heating system:
We definitely want a heat pump (so please don’t try to convince us otherwise).
a) Ground-source heat pump (Alpha Innotec) with borehole drilling (about 80m (260 ft) depth possible with 45W/m efficiency, clay subsoil)
b) Air-to-water heat pump with COP >3.5 (Alpha Innotec) in mono-variant operation
Possibly a traditional tile stove in the living-dining area as additional support during the transitional seasons.
Climatically speaking, our location is not really favorable, with rather moderate to lower average temperatures compared to climatically advantaged regions, such as southern Germany.
I am interested in what would make the most sense energy-wise, regardless of investment costs. Of course, investment costs are also important; naturally, the air-to-water heat pump alone would be the cheapest option – but would that be economical for our planned house?
We would like to achieve KfW 70 standard, which should be feasible. Do you see any chances to reach KfW 55? What would be needed for that?
Thank you very much in advance for your help!
Similar topics