Underfloor heating is rustling - what can this be?

In many cases, disturbing noises from the floor heating are a real pain. The constant noise can be very grueling, but a cause is often not easy to find. Read here what all the noise in the lines can cause, and how to fix it.

Creation possibilities for noise noise

Too high flow

Basically, one can assume that most of the noise is probably due to too high or an unadapted flow rate inside the heating tubes. This is often the main cause of flow noise.

If the flow rate in the underfloor heating is too high, there may be noisy noises.

This problem can usually be solved by correct hydraulic balancing. This is also true when it gurgles in individual tubes.

Air in the system

The flow noise in the air in the system sound a bit different than too high speeds. In many cases, air in the pipes can also cause noisy noises.

Modern underfloor heating systems are usually equipped with automatic ventilation systems today. This is not always the case, in addition, automatic vents do not always work perfectly. Above all, the automatic venting always takes some time to actually help effectively.

A manual bleeding can therefore be a remedial measure that you can certainly try.

Not enough water

After venting and otherwise at regular intervals, water should be added to the underfloor heating system. If there is too little water in the pipes, this can also lead to flow noise.

Whenever you need to top up the amount of water and where you can replenish the water, ask your local heating contractor who is familiar with their type of system. Otherwise, you can also contact the manufacturer of the system.

The amount of water to be replenished usually results from the required pressure, which the system requires. This can be read on a display.
However, always make sure that the boiler circuit and heating circuits are not separate circuits in their system.

Rare cases

Noise from the distributor

Noise can also come from the distribution box in rare cases. Depending on the building materials used in the house can often take place a very good sound transmission through the walls. This is especially true where individual parts of the heating system have not been mounted sufficiently sound-decoupled.

Pump failures can also be the cause of noise in the lines. The pump may also be set incorrectly. Such settings can only be checked and corrected by the heating contractor.

Tips & Tricks

An indication of incorrect pump settings may be that a pump "clocks" - so permanently on and off again. As a rule, this must not be the case with underfloor heating systems. And of course you should also make sure that the pump does not run at full load during normal heating - this can also generate noise in the lines. In this case - assuming the pump is undamaged - the pump capacity is incorrectly selected (too small).