FAQs Underfloor heating

Answer
Since “heat source” radiant heating utilises such a large surface area, thermal comfort can be achieved at lower temperatures compared to “concentrated” heat sources such as radiators. An even floor surface temperature provides a comfortable energy spread. For this reason, the room temperature can be set up to 2 degrees (°C) lower. This saves up to 12% of energy consumption.

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Answer
Within a lightweight system the pipe is fixed to the PS-insulation due to the omega shape of the heat emission plate. In addition, the width and thickness of the heat emission plate are designed to provide optimised performance. The heat emission plates have pre-determinated breaking points, which allow tool-free mounting.

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Answer
Our recommendation for achieving a hydraulic balance comprises a cross-reference to the general technical guidelines and norms which form part of every installer’s training. In particular, the hydraulic balance for single sections (apartments) must be viewed as a general concept. The pipe diameter, size of circulation pumps and – depending on the need – the use of riser and throttle valves should be taken into consideration.

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Answer
There is no clear answer to this question. Since the installation of both, the heating and electric system represent totally different areas of expertise, it can be assumed that in most cases the electric wiring of the room thermostats and actuators will be performed by the electricians in charge of the building. In such a case the components will be provided by the craftsman in charge. However, the control systems offered by Uponor (“Uponor radio room control” and “Uponor room wired control”) can be installed by the installation engineer, since these elements operate at a low voltage level. Only the 230V power outlet in the manifold cabinet must be provided by an electrician.

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Answer
If the planning and mounting of pipe lengths differ significantly, i.e. there are different heating loop lengths, an additional calculation should be conducted for the throttle pre-settings. In line with German standard DIN 18380, this task should be performed by the installation company in charge. You will find the required form enclosed with the mounting instruction for the Uponor manifold, or in the Uponor product catalogue.

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Answer
Peripheral and expansion joints are required for any screed, with or without radiant heating! German standard DIN 18560, part 2 “Screeds and heating screeds on insulation layers” explicitly, states the following: “The screed joints drawing must be provided by the construction designer…”. Within the heating screed’s surface, 3 types of joints must to be taken into consideration.
Peripheral joints must be equipped with edging strips along enclosing walls or other building elements, such as door frames. Edging strips should absorb the extension of the screed body and provide sound protection for other parts of the building.
Expansion joints filled with elastic material within the screed fields separate the screed at their full diameter and absorb length extensions.
Shrinking joints are cut into the freshly mounted screed using a trowel at a maximum depth of about 1/3 of the layer. The shrinking joint provides stress release during the screeds drying period. Afterwards, these joints can be closed as long as they are not in a door area. In such a case, the shrinking joint should be moved up to the floor surface.
It is important that a joint plan be formulated for the radiant heating system in order to adjust the heating loops to the joint areas, since expansion joints can be crossed by supply lines only. At this point, the heating pipes must be equipped with protection pipes or coatings of ca. 30 cm.
The extension joints must be transferred to the floor covering. An early stage clarification of the joint layout is required if the floor covering should consist of stone plates or tiles, since the arrangement and mounting of these affects the joints’ position.

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Answer
Normally, pipes made of PE-X (cross-linked polyethylene) are used in radiant heating systems. These must comply with the radiant heating requirements according to German standard DIN 4726 and DIN ES ISO 15875 1-5. A corresponding certificate must be provided by the manufacturer if a DIN CERTCO certification or DIN print plus a registration number are not imprinted on the pipe. DIN CERTCO certification guarantees product quality with respect to the designated field of application, as well the manufacturer’s own testing and frequent external third-party examination. This is conducted by a neutral institution licensed by the certification authorities. Uponor has DIN CERTCO certification for all of the pipes it offers.

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Answer
Uponor pipes with an oxygen diffusion barrier are manufactured from peroxide cross-linked polyethylene (PE-Xa) using the Engel method. A 0.1 mm, specially developed foil ensures the diffusion tightness of Uponor pipes, using the Engel method in accordance with German standard DIN 4726. The foil is protected against scratching and external impacts by a coating of linked PE. For this reason, measures such as a system split or the use of a corrosion inhibitor are unnecessary. According to DIN 4726, a plastic pipe is defined as diffusion-tight if the oxygen intake (applying the test conditions) is <= 0.1 g/(m³.d).
The Uponor PE-Xa pipe achieves a value lower than 0.005 g/(m³.d). Thus, corrosion due to the use of Uponor PE-Xa pipes can be excluded. When evaluating the corrosion of the internal steel parts of a heating system, it should be borne in mind that every connection within the system which is not welded or soldered allows oxygen intake.
Furthermore, all PE-X pipes provided by Uponor within the radiant heating system are in compliance with a high standard in line with (or even more than meeting the requirements of) all applicable laws.

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