ᐅ Adjusting the Flow Rate of Underfloor Heating with an Air Source Heat Pump
Created on: 27 Dec 2025 15:28
D
delbau
Hello everyone,
We have been living for some time now in our well-insulated house with an air source heat pump and underfloor heating. We have properly set up the air source heat pump and have turned off the thermostats.
However, one room is always too warm while another is too cold.
Therefore, I would like to slightly adjust the flow rate of the underfloor heating.
That means increasing it in the cold room and decreasing it in the warm room.
It seems that this can be done using the small tubes on the supply line.
One of the tubes had the square section broken off at the top from the start, which was done by the heating installer.
I have now carefully tried to adjust the flow by turning it, but the tube does not move, and I am worried about breaking it.
Am I correct in assuming that the tube must really be turned using the square section?
Can it be damaged mechanically like that? I would rather avoid causing a water leak :-)
We have been living for some time now in our well-insulated house with an air source heat pump and underfloor heating. We have properly set up the air source heat pump and have turned off the thermostats.
However, one room is always too warm while another is too cold.
Therefore, I would like to slightly adjust the flow rate of the underfloor heating.
That means increasing it in the cold room and decreasing it in the warm room.
It seems that this can be done using the small tubes on the supply line.
One of the tubes had the square section broken off at the top from the start, which was done by the heating installer.
I have now carefully tried to adjust the flow by turning it, but the tube does not move, and I am worried about breaking it.
Am I correct in assuming that the tube must really be turned using the square section?
Can it be damaged mechanically like that? I would rather avoid causing a water leak :-)
R
RotorMotor30 Dec 2025 07:55Normally, the actuators are clipped in place. They can be easily removed and reattached for adjustment.
I set the actuators to “open” a few years ago, and the thermostats are additionally set to 30 degrees Celsius (86°F). I have configured the heat pump to maintain a constant temperature, which generally works well. Only two rooms need adjustment—one is too warm, the other too cold.
Thank you for your help!
Thank you for your help!
R
RotorMotor30 Dec 2025 09:23Do the actuators still consume electricity?
Most actuators are powered when the thermostat is set to 30 degrees Celsius (86°F).
At 1-2W per actuator and 20 actuators, that could add up to a significant amount.
I would recommend checking this and setting the thermostats to frost protection instead.
Most actuators are powered when the thermostat is set to 30 degrees Celsius (86°F).
At 1-2W per actuator and 20 actuators, that could add up to a significant amount.
I would recommend checking this and setting the thermostats to frost protection instead.
RotorMotor schrieb:
Do the actuators still consume electricity?
Most actuators are powered when the thermostat is set to 30 degrees Celsius (86°F).
At 1-2W per actuator and 20 actuators, that adds up to quite a bit.
I would check that and rather set the thermostats to frost protection mode. Currently, these are powered while in the open position.
Actually, disconnecting them would make sense, but I’m a bit hesitant to work with 230V and don’t want to make a mistake :-)
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