Wall heaters do not reach the desired temperature

I am grateful for any help.

Exactly, three additional 2 sqm wall heating elements have been installed. They have a flow rate of 1 l/min. I changed the spacing to 10 cm. I just checked the design. The underfloor heating in the bathroom is 110 meters; unfortunately, I don’t have the length for the wall heating elements. I read the flow rate on the heating circuit distributor. The bathroom is adjacent to the HWS, which currently has 22 degrees; no other room, so only exterior walls.

It looks roughly like this, only the pipes for the wall heating are thinner and have an extra circuit:

How? All three WHs in the bathroom as an extra circuit? I think that would be rather unfavorable. That would be three short circuits.

Have you already tried to increase the flow rate of the WH?

Bathroom, as mentioned, is usually the problem area. There is usually nothing under the shower/bathtub, but a lot of exterior wall area plus roof.
What’s strange is that you already considered WHs and it was probably designed for 24 degrees (calculated).
Are you running the temperatures (flow temperature) as assumed in the design calculation?

No, all three WH are connected to one circuit. I can set the flow rate of the WH to max and observe. In the calculation, I don't find any heating curve or similar, only the maximum design temperature, which is 35°C at -11.6°C AT.

Mmh. So 24 degrees in the bathroom is basically really intense. I wonder if you can even manage that. Keep in mind that now you have to wait 24 hours to see if it makes any difference.

If I were you, I would also go looking for errors. But maybe in the end it turns out that it’s easier to put an additional heater in the bathroom. A small fan heater with a timer and/or remote control. In the end usually better than cranking up the whole system unnecessarily just because of the bathroom.

I mean, I could also suggest putting up/hanging an infrared heater now. but it's not really the right thing. We also have about 10sqm, of which 7 (the numbers are +/-) have underfloor heating. Without any additional requests regarding the distances. And it's nice and warm when we want. These heating loops on the walls in addition should also make the bathroom boil. The flow is open… :confused:

Yes, so with a setting of 35 degrees on NAT and additional WH, there should definitely be more. More than 21 for sure.