Properly vent underfloor heating

If an underfloor heating is installed, the system must be filled, flushed, and vented before commissioning. Only in this way will the floor become evenly warm, and the underfloor heating can heat efficiently and energy-saving.

Why an Underfloor Heating must be vented

Variotherm exclusively uses aluminium multi-layer composite pipes, which are 100% oxygen diffusion tight. This means that no air can penetrate the heating pipes during operation. Thus, the underfloor heating from Variotherm is maintenance free after filling, flushing, and venting.

How to properly vent an underfloor heating system

Connecting, filling, flushing, and venting of the heating system are carried out by an installer. The flushing and filling station is connected to the two KFE valves (boiler filling and draining valve) of the heating circuit manifold. This station consists of a powerful pump and a tank filled with treated water according to ÖNORM H 5195-1 or VDI 2035. If all shut-off valves and valves on the heating circuit manifold are correctly set, the flushing and filling station can be switched on. The treated water is pushed through the supply line through the heating circuits and thoroughly flushed. The specialist fills and vents each heating circuit until the entire system is free of air inclusions. If no air bubbles are visible in the water tank, the underfloor heating is completely vented. Once the heating system is flushed and vented, the specialist performs the hydraulic balancing. The heating water is then optimally distributed in all rooms, and it becomes evenly warm.