ᐅ Underfloor heating warm even when turned off – cold even when turned on
Created on: 20 Nov 2024 22:19
C
chrbrnr
Hello everyone,
I recently bought a house. After the purchase, I noticed something strange. Maybe someone here has an idea what could be causing it.
It is a house built in 1992, with underfloor heating on the ground floor (plus a small radiator in the bathroom) and conventional radiators on the upper floor. The gas boiler is from 2014.
Until the beginning of this week, the heating was in hot water operation only, without heating. All underfloor heating circuits were turned off. Still, in the study (north side, standard window) the floor temperature was 24°C (75°F), while in the bedroom (south side, window plus patio door) on the other side of the hallway it was only 14°C (57°F). In the living room (south side, two patio doors, three windows) the temperature was around 19°C (66°F).
Since midweek, the heating is operating in both heating and hot water mode. The heating circuit for the bedroom is slightly open. For the study, it is still completely off. The floor temperature in the study has risen to a cozy 27°C (81°F). In the bedroom, it only increased to 15°C (59°F).
The valves are controlled by the usual plastic caps, so nothing smart. The valve stems move freely as far as I could see after removing the caps.
I cannot rule out that the labeling of the circuits is incorrect. That would definitely be a possible explanation for the behavior after switching on the heating.
What I wonder is: how can such temperature differences occur when the heating function is turned off, and why do they increase so much when the heating is switched on?
Best regards
I recently bought a house. After the purchase, I noticed something strange. Maybe someone here has an idea what could be causing it.
It is a house built in 1992, with underfloor heating on the ground floor (plus a small radiator in the bathroom) and conventional radiators on the upper floor. The gas boiler is from 2014.
Until the beginning of this week, the heating was in hot water operation only, without heating. All underfloor heating circuits were turned off. Still, in the study (north side, standard window) the floor temperature was 24°C (75°F), while in the bedroom (south side, window plus patio door) on the other side of the hallway it was only 14°C (57°F). In the living room (south side, two patio doors, three windows) the temperature was around 19°C (66°F).
Since midweek, the heating is operating in both heating and hot water mode. The heating circuit for the bedroom is slightly open. For the study, it is still completely off. The floor temperature in the study has risen to a cozy 27°C (81°F). In the bedroom, it only increased to 15°C (59°F).
The valves are controlled by the usual plastic caps, so nothing smart. The valve stems move freely as far as I could see after removing the caps.
I cannot rule out that the labeling of the circuits is incorrect. That would definitely be a possible explanation for the behavior after switching on the heating.
What I wonder is: how can such temperature differences occur when the heating function is turned off, and why do they increase so much when the heating is switched on?
Best regards
Musketier schrieb:
Maybe you should post a picture of the manual regulator; that might help. I’d be happy to do that once I’m “over there” again. I’m still sitting in the old apartment right now.
The parts look roughly like in this picture. Unfortunately, behind the picture there’s only a message saying "The classified ad is no longer available," and there’s no larger version of the image.
Below that is a thermostat valve with an M30x1.5 thread, like those on a standard radiator, only here it’s on the heating circuit manifold for the underfloor heating. However, I can’t use a regular radiator thermostat head because it would open or close depending on the temperature inside the wall box where the regulators are located. Instead, I need a thermostat knob that statically controls the flow.
For now, I just want a simple, pragmatic solution to get through the winter and then take a closer look at the entire heating system next year.