Hello, we are currently planning our single-family house of 165 m² (1,777 sq ft) in the Sauerland region.
We want to build using 36.5 or 42.5 cm (14.4 or 16.7 inches) hollow bricks without additional insulation, as we are not fans of external thermal insulation composite systems (ETICS). Underfloor heating is planned, probably no ventilation system, as it is too expensive.
Since the village is not connected to the natural gas network and we have no basement, therefore no space for, for example, pellet storage, we have to install a heat pump.
A ground source heat pump would cost €4,500 more after deducting the BAFa subsidy compared to an air source heat pump.
I have also often read that heat pumps do not make sense with monolithic construction.
What would you recommend?
We want to build using 36.5 or 42.5 cm (14.4 or 16.7 inches) hollow bricks without additional insulation, as we are not fans of external thermal insulation composite systems (ETICS). Underfloor heating is planned, probably no ventilation system, as it is too expensive.
Since the village is not connected to the natural gas network and we have no basement, therefore no space for, for example, pellet storage, we have to install a heat pump.
A ground source heat pump would cost €4,500 more after deducting the BAFa subsidy compared to an air source heat pump.
I have also often read that heat pumps do not make sense with monolithic construction.
What would you recommend?
I really had to laugh when I read the original poster’s text. Where did you get that from? Honestly, I approached the topic of air-to-water heat pumps with some prejudice myself. My assumption was that the outdoor unit would often freeze in winter, and you’d have to live without heating or rely on electric resistance heating for 1-2 weeks until a technician arrives. We proactively set the electric heater to turn off in case of an outdoor unit malfunction for both water heating and space heating. Our construction coordinator specified the air-to-water heat pump for us; in his projects, he only installs the Alpha Innotec 70 something model. He said it gives him the least trouble, so that’s what we chose.
The underfloor heating has been running without any issues for one month now. Well, winter is still ahead, but just in case, we also have the fireplace.
Regarding the monolithic construction, air-to-water heat pump, photovoltaics, geothermal heat exchanger, and centrally controlled residential ventilation, I can say from my experience that it’s a good combination.
The meter was installed on July 21, and since then we have consumed 13xx kWh and produced 28xx kWh (140 m² (1507 sq ft) living area and 70 m² (753 sq ft) basement).
The system is 8.7 kWp and currently has no battery storage (that will be added at the end of February). I have an all-electric car which I mostly charge at home and drive about 70 km (43 miles) per day. Just to give some context to these figures.
The underfloor heating has been running without any issues for one month now. Well, winter is still ahead, but just in case, we also have the fireplace.
Regarding the monolithic construction, air-to-water heat pump, photovoltaics, geothermal heat exchanger, and centrally controlled residential ventilation, I can say from my experience that it’s a good combination.
The meter was installed on July 21, and since then we have consumed 13xx kWh and produced 28xx kWh (140 m² (1507 sq ft) living area and 70 m² (753 sq ft) basement).
The system is 8.7 kWp and currently has no battery storage (that will be added at the end of February). I have an all-electric car which I mostly charge at home and drive about 70 km (43 miles) per day. Just to give some context to these figures.
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boxandroof5 Nov 2019 08:42There is no gas connection, this might have been overlooked. The discussion only makes sense if the gas tank is taken into account.
If the region is expected to have a lot of snow and cold temperatures, geothermal energy should be considered instead of an air-to-water heat pump. This means a horizontal ground loop collector or, if necessary, the more expensive drilling option, which eliminates the need for an outdoor unit.
If the region is expected to have a lot of snow and cold temperatures, geothermal energy should be considered instead of an air-to-water heat pump. This means a horizontal ground loop collector or, if necessary, the more expensive drilling option, which eliminates the need for an outdoor unit.
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boxandroof5 Nov 2019 08:54Zaba12 schrieb:
My assumption was that the outdoor unit tends to ice up in winter, and then you have to go 1-2 weeks without heating or rely on the electric heating rods until a technician arrives. It's quite bold to install such a unit on your house anyway.
Zaba12 schrieb:
8.7 kWp system size without storage yet (which will be added at the end of February). Didn't you recently refer to calculations showing that photovoltaic storage systems are not cost-effective? What made you change your mind?
boxandroof schrieb:
Very bold to put a unit like that next to the house anyway
Didn’t you recently refer to calculations showing that photovoltaic storage systems don’t pay off? What made you change your mind? That’s true. But I still have plenty of budget left. I want to use it up.
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boxandroof5 Nov 2019 09:06I didn't expect any other answer.
Specifically:
Our children live in a monolithic house built to energy-saving regulation standards, made of 30cm (12 inches) Ytong blocks with plaster, and heat it using a geothermal heat pump and a Junkers air-to-water heat pump. After initial setup issues, it now operates smoothly and at costs per square meter comparable to ours; we heat a similar style house with gas. (Energy costs of 6.00 euros per square meter per year, theirs for electricity, ours for electricity and gas.)
A mechanical ventilation system with heat recovery is not necessary. The houses are ventilated through regelAir vents and exhaust via Maico or similar exhaust fans in the bathroom.
Our children live in a monolithic house built to energy-saving regulation standards, made of 30cm (12 inches) Ytong blocks with plaster, and heat it using a geothermal heat pump and a Junkers air-to-water heat pump. After initial setup issues, it now operates smoothly and at costs per square meter comparable to ours; we heat a similar style house with gas. (Energy costs of 6.00 euros per square meter per year, theirs for electricity, ours for electricity and gas.)
A mechanical ventilation system with heat recovery is not necessary. The houses are ventilated through regelAir vents and exhaust via Maico or similar exhaust fans in the bathroom.
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