FAQ

• Heating film – primarily for floating floors or dry-build systems (OSB, Fermacell).
• Heating mat – self-adhesive mesh with a heating cable, designed for installation under tiles in adhesive / levelling compound.
• The mat is more robust; the film is thinner and provides more even radiant heating over the surface.

• LARX carbon films: 60 / 100 / 150 / 180 W/m².
• Heating mats: 160–180 W/m² depending on the type.
• The right power rating depends on the room, floor covering, and the building’s heat loss.

• Surface temperature typically 35–45 °C (depending on output and control settings).
• Controlled by a thermostat with a floor sensor.

• Widths: 0.5 / 0.8 / 1.0 m. Length can be shortened along the marked cut lines.
• Examples:
  • LARX-CF100W050S → 100 W/m², width 0.5 m
  • LARX-CF060W050S → 60 W/m², width 0.5 m

• Approximately 5 cm between loops.
• With a 0.5 m mat width, this is roughly 10 m of cable per 1 m mat length (approx., depending on output).

• Approximate guidance by output:
  • 60 W/m² → approx. 880 Ω/m²
  • 100 W/m² → approx. 530 Ω/m²
  • 150 W/m² → approx. 350 Ω/m²
• Exact values are in the technical datasheet. Measure resistance before, during, and after installation for warranty purposes.

• Yes in bathrooms / wet areas – install an earthed shielding mesh / copper grid above the film.
• The film does not have a dedicated PE conductor.
• In dry rooms it is not mandatory, but it is recommended (EMC).

• A smooth, dry, solid, and level surface. Avoid sharp unevenness.
• Recommended 0.2 mm PE separation foil below and above the heating film, especially under floating floors.

1. Subfloor (concrete / OSB / anhydrite)
2. 0.2 mm PE foil
3. LARX carbon heating film
4. 0.2 mm PE foil
5. Floor covering (laminate, vinyl, engineered floating wood)

1. Thermal insulation (e.g., EPS)
2. LARX film
3. PE foil (water protection)
4. Anhydrite / concrete (min. 3 cm above the film)
5. Floor covering (tiles, glued vinyl)

No. They are laid loose and fixed with tape (textile / butyl) to prevent shifting during installation.

230 V AC, no transformer required.

• Recommended protection: 10 A / 16 A depending on circuit load.
• Cables: up to 10 A → Cu 1.5 mm²; above 10 A → Cu 2.5 mm² (consider length and voltage drop).

Yes, as long as the total does not exceed the thermostat current limit (typically 16 A ≈ 3,600 W). Higher loads via a contactor/relay.

• LARX Wi-Fi Thermostat – smart control via app.
• LARX TOUCH – touch control with weekly schedule.
• Input for an NTC floor sensor (usually 10 kΩ @ 25 °C).

• Laminate / wood: 27–30 °C
• Vinyl: 30–32 °C
• Tiles: up to 35 °C

A properly configured thermostat prevents overheating.

Not recommended. Under heavy, non-ventilated furniture there is a risk of local overheating. Install only in free, ventilated zones.

Response time 5–15 min, full comfort typically within ~30 min (depending on the build-up).

With correct installation, 30+ years maintenance-free (no moving parts).

• Measure resistance and compare with the catalogue (tolerance ± 5 %).
• Briefly connect (1–2 min) – even heating across the surface.
• After installation, measure again and record it in the warranty card.

• Check the thermostat, sensor, and circuit protection.
• There must be 230 V at the terminals.
• Measure resistance – an open circuit (∞) indicates a damaged conductor → contact service.

Warning: do not attempt to repair the film by DIY soldering.

Yes. It can be supplied from inverters (ideally with surplus-control logic). Suitable in combination with a battery and control system (e.g., Loxone).

Yes. Each room/circuit has its own thermostat and sensor; a higher-level system can coordinate zones according to schedules/priorities.

• Classic – standard for typical installations.
• Grounded – conductive shielding layer (better EMC, protection).
• Tough – reinforced construction for higher durability, suitable also under screed.

• Power [W] = output per m² × area (e.g., 10 m² × 100 W/m² = 1,000 W).
• Consumption can be measured by a plug-in wattmeter or a smart thermostat / Loxone.

The symmetric film design ensures minimal EMF. In bathrooms, an earthed shielding mesh can be added.

• Cable mat: min. 5× the cable diameter (approx. 5 cm).
• Film: gentle bending is possible, but the conductive strips must not be kinked or broken.

• Yes, only at the marked cut points (typically every ~25 cm).
• Never cut across the conductors!