Why is it important to perfom a thermal shock in underfloor heating system?

In recent years, more and more homes are built with the underfloor heating system, both for esthetic reasons and for energy savings. This system is in fact able to transmit and spread heat homogeneously from the bottom up, in contrast to radiators that release heat in a more limited area. In spite of a considerable initial cost, the underfloor system can ensure an energy saving equal to 25% in one year. Moreover, it is reduced the formation of dust harmful to health that are invevitably created with radiators and fancoil.
The radiant screed is one of the key elements in the efficiency of the underfloor heating system. It must comply with several requirements such as flatness, high mechanical strength, dimensional stability and high thermal conductivity in order to ensure heat transmission. An underfloor heating systems must be realized properly by professionals in the sector to avoid unpleasant inconveniences after posing the floor (parquet or tiles), for example raising or swelling due to too much residual humidity.

The rule EN UNI 1264-4:2021 relating to the design and implementation requirements for floor, ceiling and wall heating/cooling systems, establishes that each underfloor heating system must undergo in the initial start-up phase a thermal shock that reproduces the future thermal changes and that ensures the stabilization of the screed. The process is regulated by this standard and provides for a gradual increase in the temperature of the water circulating in the pipes to be maintained for several days. The purpose is to eliminate the residual moisture and check the correct construction of the screed and avoid subsequent cracking during or after laying the floors.
To do this you obviously need to use a high-degree of control heating system, but often it happens that in the building where you are performing the work there is still no gas connection. And this is where screed heating pumps come into play, that is, electric boilers to be temporarily connected to the plant. These pumps, thanks to a specific function, are able to circulate hot water in the floor system in full autonomy for several hours, according to the methods indicated by the legislation.

The New screed heating pump (SKU 70863) that Tecnogas offers you is portable system (weight 33 kg) ideal for hot testing of thermal systems. The thermal system is fully assembled and wired both electrically and hydraulically. The device is adjustable from 1 to 13 kW, it is equipped with circulation pump and prepared for the production of low and high temperature water. The tank has a maximum capacity of 5 l and the capacity of the expansion vessel is equal to 8 l . At the end, it is possible to export a report in which are summarized all steps of stabilization process of the pump. This report must be attached to technical documentation regarding the system and delivered to the customer as required by law EN UNI 1264-4.

If you want receive more information about the new screed heating pump, contact our Export Dept.