ᐅ Underfloor heating: actual supply temperature remains constant

Hello,

During the screed heating program, the set supply temperature of the underfloor heating was 35 degrees on May 4, 40 degrees on May 6, 43 degrees on May 7, and 45 degrees on May 8, which is intended to remain the highest setting. However, the actual supply temperature has only increased from 36 degrees to 38 degrees since May 4. Is this normal?

Thank you.

Good morning,
a bit more information would be helpful, as this is not normal.

What type of heating system is installed? How much area is being heated?

We had a similar issue once in a multi-family building. The client tried to use a heat pump for drying the screed. However, the electric heating element had not yet been installed, so the heat pump simply couldn’t provide enough supply temperature. The solution was an additional electric heater.

Be glad. I would keep the temperature as is if this is a new build.

For functional heating, the current recommendation is to only reach the maximum design temperature of the underfloor heating system, as this is better for the screed. In new builds, the maximum supply temperature is 35°C (95°F) or preferably even lower. I have also often read general recommendations/heating protocols suggesting heating up to 55°C (131°F) – but that is outdated.

By the way, screed drying is formally something different, but even then the temperature is not increased.

I personally set mine to only 28°C (82°F) because that was calculated as the maximum supply temperature.

Without further information, it is only speculation why your heating system cannot go above that. It initially sounds like a heat pump. In that case, it would be completely normal.