Underfloor heating - with which disadvantages you have to reckon

Underfloor heating is a heating system that generates a very pleasant room heat. In addition to its numerous advantages, however, one must also have some disadvantages in the case of underfloor heating systems. What these are and how they can be compensated, read here.


The installation is, if the underfloor heating miteingebaut equal to the new building, usually quite unproblematic. However, subsequent installation is often associated with high costs, and often brings with it problems.


The conversion of an existing radiator heating requires a considerable effort, which does not always justified justified in the old building. The partial conversion of the building is often even more complicated, since in many cases a separate heating circuit for underfloor heating must be created, otherwise the flow temperatures do not match.

Simpler systems, such as retrofit thin-bed underfloor heating, are often problematic on larger surfaces, and are actually intended for single rooms only. Only a few thin-bed systems are actually designed for full heating.

In electrical underfloor heating, although the installation is often unproblematic, but the operating costs are very high. In addition, the electric underfloor heating is not intended as a full heating system, but only to additional temperature control of the floor.

Maintenance and maintenance costs

Repairs to underfloor heating systems are complicated because the heating system is under the laid flooring and in most cases embedded in a floating screed. Pipe replacement is very costly on many systems.

Renovations of old floor heating systems can generally only be carried out at very high cost. But they are often necessary after a few years of operation, since many of the plastic pipes used can clog over time. They must then be exchanged.

The obstruction is due to the so-called scouring of the underfloor heating: The oxygen entering through the plastic pipes corrodes the steel parts of the system and this corrosion causes the sludge that clogs the pipes. The thinner the pipes of the underfloor heating, the greater the danger.

However, the installation of a plate heat exchanger can at least reduce this risk.

Limited choice of floor coverings

On a floor heating make only floor coverings that have a correspondingly high heat transfer value. These are for example tiles. Carpeting and many other floor coverings are not suitable for underfloor heating.

Thus, the selection is often severely limited, and many design options can not be realized.

heating capacity

Underfloor heating systems must be sufficiently dimensioned and carefully planned to ensure that the required heating demand can be met in any case.

Especially in the modern low-temperature systems, which work with very limited flow temperatures, there is this risk.

In addition, however, one has to put up with every underfloor heating that the room temperature on the floor heating can be increased only very slowly. So you have to plan accordingly with correspondingly long heating times.

Advantages and disadvantages at a glance

  • Underfloor heating creates a pleasant indoor climate and a uniform heating in the room
  • Modern underfloor heating systems are very efficient, because they mainly work with radiant heat - these advantages are only available with a few types of heating (such as infrared heating or tiled stoves)
  • However, retrofitting is problematic, as well as repairs or renovations on many systems extremely expensive
  • too low a dimensioned floor heating leads to constant freezing and a very unpleasant feeling, but can only be dimensioned higher at great expense
  • Floor heating systems react very slowly in the event of sudden cold spells

Tips & Tricks

It used to be that underfloor heating could cause "fat legs" and even varicose veins. These disadvantages no longer apply to modern underfloor heating systems - they only applied to systems that worked with sometimes extremely high surface temperatures.

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