ᐅ Underfloor Heating – Heating Circuit Remains Too Cold

Hello everyone,

I came across this forum while looking for explanations or instructions regarding my underfloor heating system and hope to get some help. My landlord is not responding, and the issue is becoming quite frustrating.

Here is the situation.

There is underfloor heating throughout the entire semi-detached house. The house is connected to a larger system that also serves other apartments and houses. In our semi-detached house, there are three distribution manifolds (basement, ground floor, upper floor). Basically, everything works as it should, except for one guest room in the basement. This room takes an extremely long time to warm up. Four days ago, we set the temperature to 22°C (72°F) because guests were coming. After two days, the room reached 20°C (68°F), but unfortunately, it has not warmed any further than 20.6°C (69°F) even after another two days.

After I increased the heating circuits in the basement, the temperature in the guest room actually dropped again. I assume this is because the cold water from the other rooms is cooling down the water in the guest room circuit.

My questions for you are:
What adjustment options do I have?
Where can I, for example, set the flow rate?
What could be the reason that the room does not reach the set temperature?

Thanks in advance

Hello,
What is your flow rate? I can’t read it from the photo. Can you increase the flow rate?
What is the return temperature of the respective heating circuit, and what about the other heating circuits?
For which room temperature was the underfloor heating in this room designed?
Regards

Bewohner0815 schrieb:

After I turned on the additional heating circuits in the basement, the temperature in the guest room actually dropped further. I assume this is because the cold water from the other rooms is cooling down the water in the guest room again.

My first guess would be that either
- the supply pipes are undersized
- the heating pump is undersized and can no longer handle the additional basement circuits
- different temperatures were assumed for the basement rooms during the heat load calculation (were they always planned as living space or only later adapted by you?)

In any of these cases, as a tenant, there is little you can do. The fact that the temperature drops as soon as you add other basement rooms does suggest that the flow for the entire basement is not adequate.
One more thing... what are the other basement rooms used for and what kind of partition walls do you have? A warm room next to unheated rooms loses a lot of heat through the walls. In that case, the calculated heat load would of course no longer be correct.

Is the actuator for Basement 1 intentionally positioned off? In my system, when the actuator is removed, the flow is initially zero.

In my system, the flow remains open when the actuator is removed.