Renew underfloor heating - what options are there?

Old underfloor heating systems are often much less efficient than modern systems and often consume significantly more energy. In addition, there are often still damages that occur during operation.
For what reasons it makes sense to renew a floor heating, or to perform a complete replacement, read here.

Problems of old floor heating

Too high flow temperature

Old heaters often work with very high flow temperatures of up to 55° C.

In contrast, modern underfloor heating generally works with flow temperatures of a maximum of 35° C. In particularly well-insulated buildings, even systems with VL temperatures of only 25° C can be used. This means a significantly lower energy consumption.

The use of modern low-temperature underfloor heating can easily save over 20% of the heat energy used compared to old models.

Poor or insufficiently planned dimensioning

Not all old floor heating systems are exactly calculated and measured. Especially in earlier times, many things were often done according to "eye-sense" and thumb-pointing.

Modern, precisely calculated underfloor heating can lead to significantly lower energy consumption and higher heating capacity.

Poor control options

The setting options for old systems are often limited. As a result, the heating from the homeowner only insufficiently regulated and adapted to the actual heating demand.

In former times, underfloor heating was mainly considered according to the motto: "Once set, and then always let go". However, more flexible controls can also significantly reduce energy consumption.

When the heating is renewed, individual room controls and thermostats can also be installed or retrofitted. This not only allows more ease of use, but also more precise control of the heating.


Underfloor heating is generally considered very sluggish. They react to temperature changes only very slowly.

This can make it necessary to freeze for a while in the event of sudden cold spells, or to use additional heaters until the underfloor heating has responded to the change and provides more heat.

Conversely, it may be too warm in individual rooms for a while, until the heater has lowered its performance.

Many new underfloor heating systems today are often much more responsive. This is especially true when capillary heating mats with a modern control system and system separation are used. In conjunction with modern control systems, this results in a very quickly reacting, well controllable and adaptable underfloor heating with very low energy consumption (minus 20 - 30 percent consumption compared to a radiator heating with the same heat generator).

Changes due to insulation

According to the EnEV there are manifold and extensive insulation regulations. Insulation during renovation of the old building results in a significantly reduced overall heat demand of the building.

After such a change in the total energy demand is the old floor heating, which was indeed designed for the old building condition, significantly oversized. In order to take into account the change in the heating demand, the underfloor heating should definitely be renewed and dimensioned smaller.

Tips & Tricks

You can easily get the old floor structure in an exchange, and simply put a new capillary heating system in mat form on the existing structure. The heating mats are then under the flooring, and are also more effective. The loss of height (additional construction height) is only about 6 - 8 mm, you can go over the thumb targeted at most sites of costs in the range of around 100 EUR per m².

Video Board: ProWarm™ underfloor heating - pumps and manifolds installation