Hello,
we are currently struggling with our heating system. It is warm everywhere in the house—both on the ground floor and in the heated basement room—around 21-22°C (70-72°F). However, the temperature in all rooms in the attic is noticeably lower, usually about 2°C (3.6°F) difference. This is problematic because a) it is too cold and b) it also affects the bathroom.
We have already tried various measures. We adjusted the heating curve, the manufacturer’s service performed a firmware update, and the hydraulic balancing was done again... but the problem remains the same. The attic stays consistently about 2°C (3.6°F) cooler than the other floors. The heating technician said this is normal because of the many windows and that it always tends to be cooler in the attic. He advised us to simply increase the supply water temperature. But that can’t be the solution, right? Although this raises the temperature in the attic, we then have to lower the temperature on the ground floor because otherwise it becomes too hot. The 2°C (3.6°F) difference always stays the same. We have solid ceilings and walls, underfloor heating everywhere, and the room thermostats turned up fully.
Is this really normal, or is the heating technician just trying to sell us that because he has no other ideas? What is your experience? Do you also have such temperature differences?
we are currently struggling with our heating system. It is warm everywhere in the house—both on the ground floor and in the heated basement room—around 21-22°C (70-72°F). However, the temperature in all rooms in the attic is noticeably lower, usually about 2°C (3.6°F) difference. This is problematic because a) it is too cold and b) it also affects the bathroom.
We have already tried various measures. We adjusted the heating curve, the manufacturer’s service performed a firmware update, and the hydraulic balancing was done again... but the problem remains the same. The attic stays consistently about 2°C (3.6°F) cooler than the other floors. The heating technician said this is normal because of the many windows and that it always tends to be cooler in the attic. He advised us to simply increase the supply water temperature. But that can’t be the solution, right? Although this raises the temperature in the attic, we then have to lower the temperature on the ground floor because otherwise it becomes too hot. The 2°C (3.6°F) difference always stays the same. We have solid ceilings and walls, underfloor heating everywhere, and the room thermostats turned up fully.
Is this really normal, or is the heating technician just trying to sell us that because he has no other ideas? What is your experience? Do you also have such temperature differences?
Hi,
???
Does that mean you don’t have room temperature controllers (RTCs) but only thermostats? And by turning them all the way up, you basically have no heating control other than the heating system’s supply temperature regulation?
And the supply temperature is set so low that even at full water flow on the ground floor you only reach about 21°C (70°F)?
And you’re surprised????
You need to give the boiler a bit more fire to work with. In reality, you won’t get a perfect balance where the whole house reaches the right temperature with every radiator fully turned up.
What supply temperature are you running?
The purpose of the RTC is exactly that you set the supply temperature a bit higher so you "offer" each room slightly more heat than needed. The RTC then does the final fine adjustment.
Best regards,
Andreas
Nafetsm schrieb:
Room thermostats turned all the way up.
???
Does that mean you don’t have room temperature controllers (RTCs) but only thermostats? And by turning them all the way up, you basically have no heating control other than the heating system’s supply temperature regulation?
And the supply temperature is set so low that even at full water flow on the ground floor you only reach about 21°C (70°F)?
And you’re surprised????
You need to give the boiler a bit more fire to work with. In reality, you won’t get a perfect balance where the whole house reaches the right temperature with every radiator fully turned up.
What supply temperature are you running?
The purpose of the RTC is exactly that you set the supply temperature a bit higher so you "offer" each room slightly more heat than needed. The RTC then does the final fine adjustment.
Best regards,
Andreas
Maybe I’m wrong. It’s probably individual room controllers after all. The description is as follows:
Room thermostat with thermal feedback
The flow temperature is currently set to 35 degrees Celsius (95°F). Previously, it was set to 32 degrees Celsius (90°F), which resulted in a room temperature of 21 degrees Celsius (70°F) at level 6. We now had to lower the controller from 6 to 4... this achieves room temperatures of 21.5 to 21.7 degrees Celsius (70.7 to 71.1°F), depending on the room. In the attic, all controllers are set to 6... the temperature there stays at 20.8 degrees Celsius (69.4°F).
I don’t understand the connection... with this setup, we should get roughly the same warmth on all floors. How do the 2-degree difference between the ground floor and the attic come about?
Room thermostat with thermal feedback
- Suitable for all heating types, e.g., gas, water, electric heating with central or individual room control
- Adjustment control with mechanical limit or lock
The flow temperature is currently set to 35 degrees Celsius (95°F). Previously, it was set to 32 degrees Celsius (90°F), which resulted in a room temperature of 21 degrees Celsius (70°F) at level 6. We now had to lower the controller from 6 to 4... this achieves room temperatures of 21.5 to 21.7 degrees Celsius (70.7 to 71.1°F), depending on the room. In the attic, all controllers are set to 6... the temperature there stays at 20.8 degrees Celsius (69.4°F).
I don’t understand the connection... with this setup, we should get roughly the same warmth on all floors. How do the 2-degree difference between the ground floor and the attic come about?
K
Knallkörper6 Mar 2017 23:35Do you have any information about the installation spacing of the heating pipes in the underfloor heating? Maybe some photos from the construction phase? It could be that the pipes are laid closer together at the bottom than at the top. With a supply temperature of 30°C (86°F), we are able to heat all rooms to over 20°C (68°F) at the current outside temperatures, with the upper areas generally being warmer. (Energy Saving Ordinance 2016 construction)
markus27037 Mar 2017 06:15You’re talking about a one-degree temperature difference. Then just increase the supply temperature a bit, set the controllers downstairs to 3 and upstairs to 6, and you’ll have warmth upstairs as well.
Depending on the construction type, it’s logical that more heat is lost upstairs. The ground floor still has a fully heated attic above it, so there is less heat loss.
Depending on the construction type, it’s logical that more heat is lost upstairs. The ground floor still has a fully heated attic above it, so there is less heat loss.
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