ᐅ Hydraulic Balancing of Underfloor Heating Systems

Hello everyone,

I have underfloor heating, but one room is not getting warm. After unscrewing the actuators for the individual room control, the situation improved slightly. However, the flow rate is still too low. Can I adjust it somehow on the transparent flow meters? It is a Pipelife underfloor heating manifold. The valves for the actuators are on the return flow and are now fully open. The glass tubes are on the supply side – this is where I would need to make adjustments (since the valves where the actuators were are fully open).

Is this possible? And if so, how? Thanks in advance to everyone who can help!

Just call a plumber....

They have already been there; everyone says something different...

If every plumber tells you something different, you are probably asking the wrong questions. The answers from a competent plumber would likely be (order may vary):

1. You don't need to adjust anything there.
2. Sure, you can do that—use a radiator key to turn the flow meters.
3. Why do you want to adjust it on the supply side? Better open all the flow meters on the supply side fully and regulate the flow rate on the return side.
4. I’d be happy to do that for you, but it will cost 500€.

Someone is trying to save money

I have now spoken with Pipelife after three installers gave me ten different suggestions (my personal favorite: tear everything out again). The flow rate on the supply line can be adjusted using a SW5 bleed key. In colder areas, increase it slightly until the return flow of the problematic room is as warm as the returns of the other circuits. That makes sense and is logical.