Spontaneous improvements to underfloor heating design

Just talk to the subcontractor about whether he will lay more pipe immediately and you pay him the additional effort directly.

I say, this can be done better, sorry. The installation spacing is too large, although I consider anything under 10cm critical, since otherwise at some point the heat flux density will be exceeded. But in the living room, for example, the spacing in my opinion is due to the fact that with the smaller spacing they would exceed the maximum radiator length of 120m and would therefore need 2 circuits. So a larger manifold and thus higher costs for the general contractor. This has not much to do with energy-optimized planning. :confused:

No design temperature is specified in the DIN.

DIN here presumably refers to the heating load calculation and room temperature.

The question for you now is: what is your time frame?
If everything is tight, you probably can't do much more.

I assume the underfloor heating will be designed for a flow temperature of 35 degrees.
Actually, something about the design should be stated somewhere in your construction specifications or in your contract.

I am currently looking at the insulation values on the plan, do you also have insulation under the [Bodenplatte]?

With us, the design is also 20°C rooms; bathrooms 24°C. However, the laying distance is usually about 6.5cm. I am active in the pink forum to "optimize" the heating. I often have two heating circuits per room.
It was similar for me: at the construction site I photographed the plans. Never heard anything about the design from the main contractor heating subcontractor. Heating load calculation only on request. A lot of "secrecy" is made about it! At first the general contractor and co said: "Documents are not ready. Calculations still need to be done." Then they said: "Nothing can be changed anymore because the calculations are already done!!"...

But in the other forum it was also said: With a small laying distance, you can already run with lower flow temperatures. But the heating engineer can also ensure that the system is "optimally loaded", e.g. by ensuring that the supply lines to the radiators are not undersized. So that the amount of heat generated by the heat pump can be properly flushed into the radiators ("taken off").


why is under 10cm critical?

As written, because otherwise the limit of the heat flux density can be exceeded. What leads to a warmer surface temperature with tiled floors can possibly result in total damage to the parquet, because it cannot withstand that temperature. Doesn't have to be, but it has happened before. Laypeople like to assume that more helps more, but it's not that simple. There is a reason why it should be planned. This applies just as much in one direction as in the other... ;)