ᐅ Wall heating systems do not reach the desired temperature

Hello everyone,

I need your help. We have the problem that we can’t get our bathroom properly warm. Due to the small underfloor heating area in the bathroom, three additional wall heaters were installed. Still, we can’t get the temperature above about 21 degrees Celsius (70°F). The calculation was based on 24 degrees Celsius (75°F). I have already switched off the EER and set the flow rate to the maximum (3 liters per minute). All other rooms easily reach their target temperature and are sometimes already at the minimum flow rate.

Do you have any other ideas on what could be done?

Thank you very much and best regards

Is this a new build?
How large is the bathroom?
What type of heating system do you have?
What do you mean by "wall heating"?
What about the other rooms?

Additionally:

Was there a hydraulic balancing done?
What are the supply and return temperatures at the current outside temperature?
What are the pipe spacing distances?

It is not unusual for the bathroom to be the problematic area. However, if it was actually designed and calculated correctly, it ideally should not be like that... ideally.

Yes, it is a newly built house. We constructed it in 2020 according to the Energy Saving Ordinance. The bathroom is just under 10 m² (108 sq ft). The house has complete underfloor heating and uses an IDM iPump ALM 2-8 as the heating system. By wall heating, I mean that additional pipes have been installed on the walls with a separate heating circuit. As mentioned, all other rooms are warm, tending to be on the warmer side. For example, the living room is around 23°C (73°F) even though I have already reduced the flow.

face26 schrieb:

Additional information:

Was there a hydraulic balancing performed?
What are the supply and return temperatures at the current outdoor temperature?
Pipe spacing?

It is not uncommon for the bathroom to be the problematic area. However, if it was actually designed and calculated properly, it shouldn’t be like that… ideally.

According to the heating technician, hydraulic balancing was done. I’m not sure about the pipe spacing right now, but I think it’s 10cm (4 inches). The supply temperature is currently 29.4°C (85°F) at 1°C (34°F) outdoor temperature.

Edit: Unfortunately, the return temperature cannot be read. It does not necessarily have to be 24°C (75°F), but 23°C (73°F) would be preferable.

Wall heating with a separate heating circuit?
If yes, what is the flow rate?
What are the lengths of the heating circuits?
Have you received a detailed design?

15cm (6 inches) spacing in the bathroom? That seems quite large. Has the same spacing been used throughout the house?
Where was the flow rate measured?
Which rooms border the bathroom? Bedroom? What temperatures are maintained there?

I am also an amateur with some self-taught knowledge, sorry for the many questions, but the more information available, the better one can at least make an educated guess.