WDS 8S — Investment in uncompromising comfort. This is the most capable system in our lineup, built for energy-efficient cottages and passive houses (Passivhaus). With an 82 mm installation width and 6 chambers, it surpasses Europe's most demanding heat-retention standards.
MD Technology (Triple Seal Systems):
What sets this system apart is its third (central) sealing circuit. It splits the gap between frame and sash into two chambers:
With WDS 8S you gain the qualities of premium German brands (Veka 82, Salamander bluEvolution) while saving as much as 30% of your budget.
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
Energy-saving at its finest. An 82 mm profile with a third sealing contour for those who won't compromise.
Engineering Specifications:
Glass Filling Choices:
Tested Performance:
Documentation
Energy-saving at its finest. An 82 mm profile with a third sealing contour for those who won't compromise.
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 8S stacks up against the closest matches from other brands.
| Specification | WDS 8SThis profile | Kömmerling 76 MD Zero | Rehau Geneo | Schüco LivIng 82 |
|---|---|---|---|---|
| Brand | WDS | Kömmerling | REHAU | Schüco |
| Material | PVC | PVC | PVC | PVC |
| Profile depth | 82mm | 76 mm | 86mm | 82mm |
| Chambers | 6 chambers | — | 6 chambers | 7 chambers |
| Glass unit, max | 44 mm / 52 mm | up to 50 mm | up to 53mm | up to 52mm |
| Thermal (Uw) | 0.88 | ≤ 0.87 | 0.85 | 0.8 |
| Sound (Rw, dB) | ≈48 Rw(dB) | ≈ 45 Rw(dB) | ≈50 Rw(dB) | ≈47 Rw(dB) |
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FAQs
The WDS 8S is the brand's deepest PVC window, with an 82 mm mounting depth, a 6-chamber frame and sash, and a 115 mm profile height. Its standout feature is a 3-contour gasket system, the added middle seal markedly lifting both heat and noise insulation. The external wall is Class A (per DSTU) for top stiffness and durable weld seams.
It reaches an A++ energy rating and a whole-window value of Uw ≤ 0.88 W/(m²·K). The profile alone holds Uf 1.0 W/m²K, with a heat resistance value of Ro 1.07 m²°C/W — among the best figures on the market. Airtightness is Class 4 and watertightness Class 9A, making it a passive-house-leaning system rather than a standard window.
The 82 mm depth accepts a glass unit of 44 mm (up to 52 mm overall), and the suggested setup is a double-chamber energy-saving unit at 44 mm with argon — that is, triple glazing. The deep frame and third seal exist to host this thick, multi-pane fill; pairing the 8S with a thin single-chamber package wastes its thermal headroom.
It is the most expensive window in the range at €580–720, so its depth and 3-contour sealing only pay off where heat loss truly matters. Skip it if:
Both are A++, 6-chamber systems, but the 8S goes deeper at 82 mm versus the 76 MD's 76 mm, pushing thermal protection from Uw ≤ 0.92 down to Uw ≤ 0.88 W/(m²·K) and sound insulation from ≈45 to ≈48 Rw(dB). The 8S is the flagship; the 76 MD (€520–630) is the near-equal step below the €580–720 8S.
The WDS 7S is a strong 70 mm, 6-chamber A-rated profile at Uw ≤ 1.2 W/(m²·K) and ≈42 Rw(dB), capped at a 40 mm glass unit. The 8S steps up to 82 mm, an A++ rating, Uw ≤ 0.88, ≈48 Rw(dB) and a 44 mm triple-glazed unit. Choose the 8S when you want the deepest, quietest, warmest option rather than a mid-range workhorse.
