ᐅ Heating system, something isn’t working correctly here. The hallway is always at 22°C (about 72°F).
Created on: 6 Oct 2022 08:21
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chewbacca123
Good morning everyone, I have a question and hope you can help me. We have been living in our newly built house with underfloor heating for three years now. Our heating system is a heat pump.
Basically, the radiators in our hallway are turned off, yet the temperature in the hallway is constantly around 22°C (72°F). Our bathroom, on the other hand, only reaches about 20.5°C (69°F) at the current supply temperature, so we always have to turn on the towel radiator; otherwise, it’s too cold in the bathroom in the morning, especially with a baby.
I just can’t understand why our hallway is so warm. When someone visits and opens the front door, the first comment is always: “It’s really hot in your hallway.” I agree, but what could be causing this? If energy is being wasted here, that would be a serious issue.
The valves embedded in the walls for the hallway heating are set to a minimum, and the manual controls for each area are also turned down to zero. Still, the hallway is very warm. It’s driving me crazy… Do you have any ideas?
Other rooms where we have the controls turned down to zero are pleasantly cool as expected.
Thanks.
Basically, the radiators in our hallway are turned off, yet the temperature in the hallway is constantly around 22°C (72°F). Our bathroom, on the other hand, only reaches about 20.5°C (69°F) at the current supply temperature, so we always have to turn on the towel radiator; otherwise, it’s too cold in the bathroom in the morning, especially with a baby.
I just can’t understand why our hallway is so warm. When someone visits and opens the front door, the first comment is always: “It’s really hot in your hallway.” I agree, but what could be causing this? If energy is being wasted here, that would be a serious issue.
The valves embedded in the walls for the hallway heating are set to a minimum, and the manual controls for each area are also turned down to zero. Still, the hallway is very warm. It’s driving me crazy… Do you have any ideas?
Other rooms where we have the controls turned down to zero are pleasantly cool as expected.
Thanks.
driver55 schrieb:
What are the flow rates at the heating circuit distributor (HKV)? And what exactly are the temperatures?Photos of the heating circuit distributor? Preferably of both.A
Alessandro8 Oct 2022 13:27Daniel-Sp schrieb:
Hi Alessandro
I have been thinking about this for a while.
But it’s not just about the temperature difference between flow and return, it’s also about the volume of water circulated, which determines the amount of heat delivered. What really matters for the heat output from the underfloor heating to the room is the temperature difference between the floor surface and the room air. How the floor surface temperature is achieved doesn’t really matter. Or am I missing something?
If you have any sources to support your point, please share them. I’m genuinely interested.
Best regards The water needs to release energy in the form of heat to warm a room. And this should happen where it’s needed, in this case the living room.
If you run many heating circuits through the hallway, each with its own flow and return, and a very small temperature difference, all pipes will be roughly the same temperature.
Even if you isolate the hallway, the impact is minimal.
With a temperature difference of 5°C (9°F), although the three flow pipes are warm, the three return pipes are “cold,” which lowers the average temperature and means the hallway doesn’t warm up as much.
D
Daniel-Sp8 Oct 2022 21:34Wasn't the issue about the heat output in the bathroom and that the flow was too high and the temperature difference too low?
chewbacca1239 Oct 2022 17:21Daniel-Sp schrieb:
Hello,
before simply reducing the flow, you should first measure the actual temperature of the return flow at the heating circuit manifold.
@chewbacca123
You bought an IR thermometer back then, right? Just measure the return manifold during the heating cycle.
And when turning down the flow, always keep an eye on the total flow rate. You have a large heat pump that requires a corresponding flow. If you reduce it too much, the heat pump won’t be able to get rid of the heat and will go into fault mode.
When the heating technician was there, check if they opened the bypass valve again.
I’m curious if the labeling in the heating circuit manifold got mixed up.
Best regards from Hamburg That’s true, I bought the thermometer back then. If only I knew where it is now ;-)
I’ll look for it.
I’ll report back after the plumber has been here on Tuesday. Best regards
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