ᐅ Spontaneous Adjustments to Underfloor Heating Design

Hello everyone,

I had a chance to take a look at our heating plan on the construction site. The subcontractor’s subcontractor will be installing the underfloor heating next week.

Now to the question:
Do you see any major mistakes here, or just things that could be quickly clarified with the tradespeople on site?
Generally, I don’t have much say regarding the underfloor heating, so I wasn’t involved in the planning. However, I hope to work out one or two minor details directly with the workers on site.

So far, I’d only try to convince them to install the underfloor heating beneath the bathtub as well (acrylic on screed / showers are embedded in the screed). Or is making a last-minute adjustment a bad idea because it could mess everything up?

Any other tips? Should I try to negotiate anything about spacing?

Thanks a lot and best regards

KingJulien

Why didn’t you have any input there?
Purchase from a developer?
What supply temperature was the heating system designed for?

Otherwise, there are clear differences in the heating circuit lengths; the bathroom already requires additional heating according to the plan.

Based on the pipe spacing, I’m guessing it’s a gas boiler...

If for any reason a heat pump is planned to be installed for heating in the future, the pipe spacing will make it difficult to achieve low flow temperatures.

KingJulien schrieb:

Do you see any major mistakes here, or just things that could be quickly clarified with the contractors?

Why such large spacing for the pipe installation? For future-proofing, 10cm (4 inches) or 5/7.5cm (2/3 inches) for bathrooms would be better — suitable for a heat pump.
Designing living areas for only 20 degrees Celsius (68°F) seems too low to me.

For comparison: For my KFW 55 apartment with 120sqm (1,292 sqft), I currently have 15 circuits. Pipe spacing between 7.5 and 10cm (3 and 4 inches). That amounts to around 1,500m (4,920 ft) of underfloor heating pipe — you have 900m (2,950 ft).

Guys... don’t stress me out. This is for a heat pump! 😱
No time right now, I’ll reply in more detail later.

T_im_Norden schrieb:

Why didn’t you have any say in that?
Developer purchase?

Large prefabricated house manufacturer. When I asked about the heating system design, they just said "according to some DIN standard."
It feels like they hardly let you get involved in the technical details. It’s a bit odd when someone shows interest 😉

T_im_Norden schrieb:

What supply temperature was the heating system planned for?

No idea... is that specified in the DIN?

nordanney schrieb:

Why such large pipe spacing?

Probably according to DIN...

So, underfloor heating under the bathtub: worth trying?

Could we possibly reduce the pipe spacing overall a bit, while keeping roughly the same ratio? Although honestly, I don’t think there’s much chance. The planning is basically finished, it would only be possible through the installers now.

nordanney schrieb:

only 20 degrees

That’s probably too cool for me as well. Our electricity consumption might not be very good with that.
Although I’m hoping to distribute a good amount of heat in the house with the (storage) wood stove.