ᐅ Wall heating systems do not reach the desired temperature

Created on: 8 Dec 2021 20:22
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EdelStoff
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
schubert799 Dec 2021 06:55
The 21 degrees Celsius (70°F) measurement is correct, right?
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EdelStoff
9 Dec 2021 07:26
What do you mean by correctly measured? There is a thermometer hanging in the bathroom.
face269 Dec 2021 07:57
EdelStoff schrieb:

What do you mean by correctly measured? There is a thermometer hanging in the bathroom.

Have you checked it with another thermometer?
Is it hanging on an exterior or interior wall?
At what height?
Have you measured the temperature in a different location?

The question is certainly valid.
Mycraft9 Dec 2021 08:16
Perform a hydraulic balancing instead of just adjusting the heating circuits randomly. Otherwise, you risk disrupting the entire hydraulic system, and the rooms won’t heat properly.

It’s also possible that the heating circuit pump cannot deliver the required flow rates.

Do you have individual room controllers? If so, disconnect them or open all of them, and then carry out the hydraulic balancing.
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driver55
9 Dec 2021 09:20
face26 schrieb:

But maybe in the end it turns out to be easier to put an additional heater in the bathroom
He already did that with the wall-mounted heaters…

What are the dimensions of the heating coils? Diameter and wall thickness? (Straws?)
face269 Dec 2021 09:27
Mycraft schrieb:

Perform a hydraulic balancing instead of just adjusting any heating circuits. Otherwise, you risk disrupting the entire hydraulics and nothing will get warm.

It’s possible that the heating circuit pump can’t deliver the required flow rates.

Do you have individual room controllers? If yes, then disconnect them or open them all, and then perform the hydraulic balancing.

Hydraulic balancing is definitely the right measure.

The original poster has throttled the other rooms, yet they still warm up. The bathroom has a flow rate of 3 liters per minute in the underfloor heating circuit. That doesn’t sound like there isn’t enough flow available, does it?

I understood that the ERR (energy regulation valve) has already been fully opened by the original poster.
driver55 schrieb:

He has already done that with the wall heating…

Yes, I also find it strange. With a design temperature of 35°C (95°F), it should actually work as mentioned.