WDS 7S — when the window becomes part of the décor. This series is made for people who refuse to trade beauty for energy efficiency. Its defining trait is the Soft Line design: gently rounded frame and sash contours lend the window a soft, refined look and shed any "office plastic" vibe.
Why WDS 7S outperforms standard options:
A perfect fit for bedrooms, children's rooms, and living rooms where warmth and visual balance count.
Brand
WDS — modern window systems combining European quality and affordable prices. The manufacturer uses German technology and strict quality control, offering a wide range of profiles: from economical 5S to flagship 8S at Passivhaus level.
More about WDSTechnical Specifications
Beauty with no trade-offs. A 6-chamber system with Soft Line styling for sophisticated interiors.
Engineering Specifications:
Glass Filling Choices:
Largest Build Sizes:
Tested Performance:
Documentation
Beauty with no trade-offs. A 6-chamber system with Soft Line styling for sophisticated interiors.
For a standard 2-sash tilt-and-turn window (1200 × 1400 mm) with basic double-glazed unit.
Alternative solutions from other manufacturers
Side by side
How WDS 7S (70 mm) stacks up against the closest matches from other brands.
| Specification | WDS 7S (70 mm)This profile | Rehau Brillant-Design 70 | Kömmerling EuroFutur Elegance | Cortizo A 70 |
|---|---|---|---|---|
| Brand | WDS | REHAU | Kömmerling | Cortizo |
| Material | PVC | PVC | PVC | PVC |
| Profile depth | 70mm | 70mm | 70 mm | 70 mm |
| Chambers | 6 chambers | 5 chambers | — | — |
| Glass unit, max | up to 40mm | up to 42mm | up to 39 mm | up to 40 mm |
| Thermal (Uw) | 1.2 | 1.2 | ≤ 1.1 | ≤ 1.1 |
| Sound (Rw, dB) | ≈42 Rw(dB) | ≈43 Rw(dB) | ≈ 40 Rw(dB) | ≈ 46 Rw(dB) |
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FAQs
WDS 7S is a 70 mm, 6-chamber PVC system with a 113 mm profile height. Sealing uses 2 contours of TPV gasket that stay flexible down to -40°C, and the steel insert is a closed or heavy-duty U-shaped reinforcement up to 2.0 mm. The external wall meets Class B gauge, balancing price against weld-seam strength.
The frame reaches Uf ~1.1 W/m²K and the finished window Uw ≤ 1.2 W/(m²·K) (energy rating A), with installed heat resistance Ro up to 0.90–1.04 m²°C/W depending on reinforcement and glass. Sound damping is Rw up to 36–38 dB at the profile, with the full unit rated around 42 dB.
The 70 mm depth accepts a glass unit up to 40 mm — enough for double-chamber units with multifunctional or energy-saving panes and argon filling. The thicker, gas-filled cavity is what lets WDS 7S hit its Uw ≤ 1.2 and ~42 dB figures. Bead profiles come in a classic or rounded version.
Honest limits to keep in mind:
Within the 70 mm line, WDS 7S (Uw ≤ 1.2, ~42 dB) tops WDS 6S (Uw ≤ 1.3, ~40 dB) and the 60 mm WDS 5S (5-chamber, Uw ≤ 1.4, ~38 dB). Stepping up, the 76 mm WDS 76 AD/MD (Uw ≤ 1.1 / 0.92) and 82 mm WDS 8S (Uw ≤ 0.88) take larger glass units up to 48–52 mm.
It is tested to Class 4 air permeability — strong airtightness under heavy wind — and Class 8A watertightness per DIN EN 12208, the highest standard rating. Combined with the twin -40°C-rated TPV seals, the system holds up to driving rain and high pressure, suiting exposed coastal and high-rise locations.
