Underfloor Heating/Cooling Systems - Detailed Information and Specific Features

Easy installation of the underfloor system

Podlahové vytápění Installation of the underfloor hydronic heating/cooling system does not require any complicated building adaptation; nevertheless, specific technical requirements must be fulfilled. For example, mutual distance between the pipes is strongly affected by the type of the flooring material. Details can be found in the Technical Instruction Sheet.

Control of the underfloor system

The underfloor system can also be used for cooling (air conditioning), if the heat pump model LWRc-8kW or LWRa-8kW is used. This kind of heating system has a high capability of self-control. This means that the total output capacity is emitted within a small temperature difference between the floor surface and the room air (usually 6°C) If temperature changes by 2°C, the output capacity of the system drops by 30%,  with no manual intervention.

The capability of self-control is a great advantage, but despite of this fact, it is possible and sometimes even necessary to control the whole system. This can be done by means of wireless control kit, which includes a central portable controller, room thermostats, receivers in the distributors and thermo-electronic actuators. Using the controller, you can remotely switch over the temperatures between the heating and cooling mode, either on individual thermostats, or on all devices at once.

How the flooring material used affects the result?

The underfloor heating system is suitable for use in combination with any flooring material.

If there are multiple kinds of flooring materials used in the property, it is necessary to pay attention to the appropriate distance between the pipes. Pipe spacing that is used under wooden flooring cannot be used under floor tiles (if we do not consider the use of different temperatures of water, which is a technically feasible, but extremely complicated option). Therefore, it is important that the designer receives an accurate and definite layout of the flooring materials in the whole property yet before the underfloor heating design is prepared. Examples of major differences between the results can be found in the summary table of underfloor heating output values and correction factors relating to each of the flooring materials used, by which the table values are multiplied.

The underfloor heating structural units (usually around 20 m²) which are separated from each other and from the walls by expanding tape seal are coherently covered with tiles laid onto permanently flexible sealant. If the tile floor exceeds the size of approx. 8m in one direction, the construction joint must be running up to the surface layer, i.e. it must be done in the floor tiling too. Floating floors are not so tricky, but the rule of a well designed and constructed skirting must be applied to both types of floors.  The flooring material must be allowed to extend up freely under this skirting due to thermal expansion.

If you decide to regulate your underfloor system by manual intervention in the temperature or flow rate, please remember that it must always be done for the whole room; that means for several loops at the same time, otherwise the floor might be irreversibly damaged.