Hello,
We have been researching heating systems online for a long time.
We are getting desperate and hope you can help me.
We are building a single-family house in Berlin Mahlsdorf.
125 m² (1,345 sq ft).
It is a 30 cm (12 inch) masonry wall (including insulation) built with Ytong system prefabricated panels.
Completely with underfloor heating and no basement.
Gable roof.
I once did a quick heating load calculation online, which was about 8.6 kW (realistic).
The builder has provided an offer for a gas condensing boiler with heat recovery.
A cost-neutral offer for an air-to-water heat pump from Thermia Atec Total 9.
With the air-to-water heat pump, we would also save on the gas connection, and we would receive a credit of 2,500 for the heat recovery.
Please help me with the decision.
If you need more details, please let me know which ones. Thank you in advance.
We have been researching heating systems online for a long time.
We are getting desperate and hope you can help me.
We are building a single-family house in Berlin Mahlsdorf.
125 m² (1,345 sq ft).
It is a 30 cm (12 inch) masonry wall (including insulation) built with Ytong system prefabricated panels.
Completely with underfloor heating and no basement.
Gable roof.
I once did a quick heating load calculation online, which was about 8.6 kW (realistic).
The builder has provided an offer for a gas condensing boiler with heat recovery.
A cost-neutral offer for an air-to-water heat pump from Thermia Atec Total 9.
With the air-to-water heat pump, we would also save on the gas connection, and we would receive a credit of 2,500 for the heat recovery.
Please help me with the decision.
If you need more details, please let me know which ones. Thank you in advance.
The sad truth is that even professionals often tend to follow the “more is better” and “more safety means fewer complaints” approach when it comes to heating system sizing... at least based on our experience.
Now I’m reading this... you get credited 2500 € and they won’t install a mechanical ventilation system with heat recovery? That’s really not ideal – I would install mechanical ventilation regardless of the heating type... just the thought of letting expensive heated air escape through the window at -10°C (14°F), especially when using an air-to-water heat pump where heating costs are high, because otherwise you can’t control humidity properly...
Go with gas and double-check whether it really needs to be 30cm (12 inches) – because it probably can’t be, at least not with Ytong blocks.
Now I’m reading this... you get credited 2500 € and they won’t install a mechanical ventilation system with heat recovery? That’s really not ideal – I would install mechanical ventilation regardless of the heating type... just the thought of letting expensive heated air escape through the window at -10°C (14°F), especially when using an air-to-water heat pump where heating costs are high, because otherwise you can’t control humidity properly...
Go with gas and double-check whether it really needs to be 30cm (12 inches) – because it probably can’t be, at least not with Ytong blocks.
Everyone is free to build however they prefer. It's a matter of personal taste. I also use 17.5cm (7 inches) aerated concrete blocks and am satisfied with them. On top of that, there is mineral wool insulation and then very solid facing bricks, which makes a significant difference.
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