Underfloor heating: Which system is right for you?
Underfloor heating has long been established as a tried-and-tested and comfortable form of heating in residential and commercial buildings. Compared to conventional radiators, it heats surfaces evenly and operates at lower flow temperatures – this conserves resources and noticeably improves living comfort.
There are essentially two types of system: electric and water-based underfloor heating.
Both have their merits – the choice depends on the building, its use and the requirements.
Electric systems use heating mats or cables installed directly beneath the floor covering. They are quick to install, versatile and particularly suitable for smaller areas, bathroom renovations or as a supplementary solution in individual rooms.
Water-based systems circulate heated water through pipes within the floor structure. They are the system of choice for larger areas and entire buildings – and reach their full potential when combined with modern heat pumps, solar thermal systems or district heating. Because they operate efficiently even at low flow temperatures, they are a compelling solution both economically and environmentally.
fermacell® gypsum fibre products have a proven track record spanning decades – offering natural materials, planning reliability and structural integrity. In response to changes in energy supply, increasing demands for efficiency and the desire for resource-efficient construction, fermacell® has developed the perfect solution: the Therm25™ element – a dry screed element that combines load distribution and underfloor heating in a single, efficient solution.
Compatible with all existing and new systems, ideal for use with heat pumps
SinceThe heating tube is milled directly into the element, ensuring maximum heat output thanks to a uniform layer, and a slimmer, more robust design
Installed as a dry lay, ready for immediate use, no drying time required; subsequent trades can resume work after 24 hours
FloorUnderfloor heating in drywall construction presents planners with specific challenges: limited installation height, sound insulation to the standard required for floor slabs separating dwellings, short construction times, and the question of which heating system to choose. The Therm25™ element provides a proven solution to all of these challenges — with a single element designed for the most common applications in new builds and refurbishments.
The heating tube is milled directly into the element – a uniform layer that conducts heat upwards immediately and evenly.
Slim-line designs from 25 mm – ideal for refurbishments and modernisation projects with limited installation height.
Installed dry, no drying time required. Subsequent work can begin after 24 hours.
Compatible with heat pumps, district heating and existing systems. Suitable for all common types of flooring.
Depending on the construction, fire resistance ratings of up to F90 can be achieved.
Can be installed using a floating method – including at the level of apartment partition ceilings with a slim dry-construction system.
Free installation plan for fermacell® Therm25™
With our bespoke installation plan, you will receive the following free of charge:
Customised installation plan
Calculation of heating output per room
List of materials with quantities
Floor plan for easy implementation
Three variants. A solution for every application.
Depending on the requirements for sound insulation, fire protection, installation height and substrate, there are three certified installation options for the Therm25™ system.
Therm25™ panel with plasterboard on top
Construction: Therm25™ panel with a macell® gypsum fibreboard (10 mm) bonded and secured over the entire surface on the top side.
Features:
The quickest and easiest way to set up
Suitable for use in all building classes and application areas AWB 1–4
Fire resistance rating F60 achieved; up to F90 with additional layers
The most cost-effective solution – excellent value for money
Ideal for new builds and refurbishments
Therm25™ panel with plasterboard on the underside and a skim coat on the top
Construction: fermacell® gypsum fibreboard (10 mm) fully bonded and secured to the underside, Therm25™ element, fully skim-coated on the top.
Features:
Very high heating output thanks to optimised heat transfer
Particularly suitable for very soft insulation materials
Suitable for use in all building classes and application areas AWB 1–4
Ideal when maximum efficiency of the underfloor heating is required
Therm25™ panel installed directly onto the substrate
Installation: The Therm25™ panel is bonded over its entire surface to a level, load-bearing substrate, with a full-surface skim coat applied to the top.
Features:
Extremely slim overall design: 25 mm
Areas of application AWB 1–2
Particularly suitable for renovation projects where headroom is severely limited