Good morning, I am currently building a single-family house to KfW55 standard with a general contractor, approximately 120 sqm (1,290 sq ft) over two floors. The price includes underfloor heating with a pipe spacing of 15 cm (6 inches), and 10 cm (4 inches) spacing in the bathroom. In many threads, a pipe spacing of 10 cm (4 inches) is recommended for all rooms. This requires about 3 m (10 feet) more piping per square meter. In your experience, what additional cost per square meter should I expect if the pipe spacing is reduced from 15 cm (6 inches) to 10 cm (4 inches)? I am waiting for the offer from the general contractor but would just like to know what the cost increase might be based on your experience. Once I have the offer, I will share the actual additional costs with you.
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Raiweired2 May 2022 15:37The contract does not mention the handover or inspection of any calculations. It states that a Buderus 196i-AR13 heat pump will be installed and that underfloor heating will be installed on the ground floor and upper floor, with a pipe spacing of 15 cm (6 inches) and 10 cm (4 inches) in the bathroom.
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Deliverer2 May 2022 15:44If that is the case, you will have to pay extra for a good system. The general contractor (GC) has no interest in this, since for most buyers, it probably only matters whether the house gets warm.
You might be able to use as a bargaining chip that, after accurate calculations, a smaller heat pump can be installed, and that the ERR and buffer tank can be omitted.
So, in the end, the costs are at least lower for the GC. How much of that savings will be passed on to you remains to be seen...
You might be able to use as a bargaining chip that, after accurate calculations, a smaller heat pump can be installed, and that the ERR and buffer tank can be omitted.
So, in the end, the costs are at least lower for the GC. How much of that savings will be passed on to you remains to be seen...
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Neubau20222 May 2022 19:40Raiweired schrieb:
The contract does not mention handing over or reviewing any calculations. It states that a Buderus 196i-AR13 heat pump will be installed and that underfloor heating will be installed on the ground floor and upper floor, with pipe spacing of 15cm (6 inches) and 10cm (4 inches) in the bathroom. This way, the general contractor avoids performing the heating load calculation. The question is whether they actually did one. Our underfloor heating is currently being installed as well. I spoke to the workers today. According to them, there are 26 heating circuits for 141 m² (1,518 sq ft) with an average pipe spacing of 10cm (4 inches). A hydraulic balancing will also be carried out.
I think that, along with the slab foundation, these are the two things you don’t want to have to redo.
Do you have an independent construction supervisor you can ask for advice?
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