Is the attic always colder than the ground floor?

Hello,

we are currently struggling with our heating. It gets nicely warm everywhere for us. On the ground floor and in the heated basement room alike... around 21-22 degrees. Only in the attic do we have significantly lower temperatures in all rooms... usually a 2-degree difference. This is unpleasant because a) it is too cold and b) it also affects the bathroom.

We have already tried various things. Adjusted the heating curve, the factory service did a firmware update, hydraulic balancing was done again... but the problem remains the same. The attic stays permanently 2 degrees cooler than the other floors. The heating technician said that this is normal because there are many windows and it always gets cooler in the attic. He said we should simply increase the flow temperature. But that can’t be the solution, right? Although this leads to a higher room temperature in the attic, we then have to turn down the temperature on the ground floor because otherwise, it becomes unbearable. The 2-degree difference always remains the same. We have massive ceilings and walls, underfloor heating everywhere. Thermostats are fully turned up.

Is this really normal, or is the heating technician just trying to make us accept this because he is out of ideas? How is it for you? Do you also have such differences?

Hi,

Room thermostats fully turned up.

???
Does that mean you don’t have ERR but just thermostats? And since they are fully turned up, you basically have no heating control except for the flow temperature control of the heating system?
And the flow temperature is so low that with full water flow on the ground floor you just barely reach 21 °C?

And you’re surprised????

You really need to give the boiler a bit more fire. The perfect balancing, where you get the whole house to the right temperature with all the radiators fully turned up, you won’t have in reality.

What flow temperature are you running?

And the ERR has exactly the purpose to offer each room slightly more heat than needed by increasing the flow temperature a bit. The ERR then does the final fine-tuning.

Best regards,

Andreas

Maybe I am wrong. It is probably individual room controllers after all. The description is as follows:

Room thermostat with thermal feedback

[*]Suitable for all types of heating, e.g. gas, water, electric heating with central/individual room control

[*]Adjustment controller with mechanical adjustment limitation or lock

Appearance see attachment.

The flow temperature is currently set to 35 degrees. Before, it was set to 32 degrees, which resulted in 21 degrees room temperature at level 6. We now had to set the controller from 6 to 4... with that we now reach 21.5 - 21.7 degrees room temperature, depending on the room. On the top floor, all controllers are set to 6... there the temperature stays at 20.8 degrees.

I do not understand the connection... in this constellation, we should be getting roughly the same warmth on all floors. How do the 2-degree differences between the ground floor and the top floor come about?

Do you perhaps have information about the installation spacing of the heating coils in the underfloor heating? Maybe photos from the construction phase? Perhaps the spacing is tighter at the bottom than at the top. With 30 °C flow temperature, we get all rooms above 20 °C at the current outside temperatures, it tends to be warmer at the top. (Energieeinsparverordnung 2016 Bau)

You are writing here about a degree of temperature difference. Then just increase the flow temperature a bit more, set the controllers below to 3 and above to 6, and you will have it warm upstairs as well.

Depending on the construction type, it is logical that more temperature is lost upstairs. The ground floor still has a fully heated attic above it, resulting in less heat loss.

At level 6 and just 21 degrees, I consider it too low. Also, I would adjust the valves of the individual heating circuits, which you haven't mentioned yet. Then increase those of the [OG].
Best regards in brief