Hello everyone,
We have finally been living in our newly built house for two weeks now. We have underfloor heating throughout the entire house and a digital thermostat in every room. All thermostats are set to 21 degrees Celsius (70°F) throughout the house, and everything works fine overall. As soon as the thermostats reach 22 degrees Celsius (72°F), they switch off—except in the children’s room. There, we have noticed that the temperature easily rises to 23 degrees Celsius (73°F) overnight, and the floor remains constantly warm compared to the other rooms.
I have already contacted the company that installed everything for us, but it will probably take some time before I receive a response. As a curious person, I would really like to understand what could be causing this or what the reason might be.
Best regards
We have finally been living in our newly built house for two weeks now. We have underfloor heating throughout the entire house and a digital thermostat in every room. All thermostats are set to 21 degrees Celsius (70°F) throughout the house, and everything works fine overall. As soon as the thermostats reach 22 degrees Celsius (72°F), they switch off—except in the children’s room. There, we have noticed that the temperature easily rises to 23 degrees Celsius (73°F) overnight, and the floor remains constantly warm compared to the other rooms.
I have already contacted the company that installed everything for us, but it will probably take some time before I receive a response. As a curious person, I would really like to understand what could be causing this or what the reason might be.
Best regards
B
boxandroof11 Nov 2019 12:05AD1988 schrieb:
Only on the upper floor do I now notice that the floor of a room becomes relatively warm.This shows that the heating curve is set too high. Therefore, this was a good hint:Joedreck schrieb:
Please urgently look into the heating curve, hydraulic balancing, and thermal balancing.
When the heating system is correctly adjusted, the difference between the good and the bad becomes clear.
Companies that struggle with this either neglected to keep up with training or are simply "plumbers" without understanding what they are doing.
In my case, the floors only start to feel slightly warm when temperatures outside drop below freezing. At the moment, everything is cold, yet the set temperatures are reached everywhere.
Companies that struggle with this either neglected to keep up with training or are simply "plumbers" without understanding what they are doing.
In my case, the floors only start to feel slightly warm when temperatures outside drop below freezing. At the moment, everything is cold, yet the set temperatures are reached everywhere.
I want to get there as well. That’s why I have already started researching and trying to understand the whole system.
Now I at least know how to calculate the heating load to determine the required flow rate for each room. The next question is how to set everything correctly.
As far as I have seen, our flow rate changes depending on how many rooms are heated at the same time. How do you properly adjust the system when the value is always varying anyway?
Now I at least know how to calculate the heating load to determine the required flow rate for each room. The next question is how to set everything correctly.
As far as I have seen, our flow rate changes depending on how many rooms are heated at the same time. How do you properly adjust the system when the value is always varying anyway?
So, first you do the following: check how to adjust the heating curve in your system.
Then open all valves fully and wait 24 hours.
If it’s too warm everywhere, lower the heating curve step by step until one room is no longer warm enough.
Then we’ll proceed from there.
You don’t need to calculate anything here. You are balancing the system thermally. There are plenty of guides for this, which only require some understanding and patience.
Then open all valves fully and wait 24 hours.
If it’s too warm everywhere, lower the heating curve step by step until one room is no longer warm enough.
Then we’ll proceed from there.
You don’t need to calculate anything here. You are balancing the system thermally. There are plenty of guides for this, which only require some understanding and patience.
I just checked our Vaillant heating system and noticed that the heating curve is set to 1.1. Isn’t that a bit too high? According to the chart, the water temperature should be heated to 40°C (104°F) at the current outside temperature. However, it is capped at a maximum of 35°C (95°F).
Edit:// I have now seen that the water temperature is limited to 35°C (95°F).
Edit:// I have now seen that the water temperature is limited to 35°C (95°F).
B
boxandroof11 Nov 2019 17:3440 or 35° is too high. In the worst case, you should require 35° flow temperature when it’s really cold. The underfloor heating circuits need flow for this: keep thermostats permanently open. Lower the heating curve until it’s no longer too warm, then adjust the circuits. Take your time and don’t change too much at once. Notes help. I cannot provide any advice on settings for Vaillant.
Example of a heating curve in a new build: 24° flow temperature at 10° outside temperature, 30° flow temperature at -14°.
Example of a heating curve in a new build: 24° flow temperature at 10° outside temperature, 30° flow temperature at -14°.
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