Kömmerling 76 MD Zero has become an architectural favorite in Spain. Its concealed-sash design makes an opening window read as fixed glazing from the street. That delivers crisp facade lines and a larger light opening than you get from conventional windows.
Built on the highly efficient 76 mm centrally sealed platform, the system marries minimalist styling with first-rate thermal insulation. A natural fit for modern and high-tech projects.
Brand
Kömmerling — European leader in PVC profile production with over 125 years of history. Their windows combine German precision with maximum energy efficiency, making them the best choice for projects requiring uncompromising quality.
More about KömmerlingTechnical Specifications
A designer "hidden sash" system. From the outside the window appears as a single pane of glass with no surrounding frame, pulling the maximum amount of light into the home — a perfect match for contemporary minimalist villas.
Core system specifications:
Glazing and infill choices:
Maximum size limits:
Tested performance values:
Documentation
A designer "hidden sash" system. From the outside the window appears as a single pane of glass with no surrounding frame, pulling the maximum amount of light into the home — a perfect match for contemporary minimalist villas.
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 Kömmerling 76 MD Zero stacks up against the closest matches from other brands.
| Specification | Kömmerling 76 MD ZeroThis profile | WDS 76 MD (76 mm) | Rehau Synego | Schüco LivIng 82 |
|---|---|---|---|---|
| Brand | Kömmerling | WDS | REHAU | Schüco |
| Material | PVC | PVC | PVC | PVC |
| Profile depth | 76 mm | 76mm | 80mm | 82mm |
| Chambers | — | 6 chambers | 7 chambers | 7 chambers |
| Glass unit, max | up to 50 mm | up to 48mm | up to 51mm | up to 52mm |
| Thermal (Uw) | ≤ 0.87 | 0.92 | 0.94 | 0.8 |
| Sound (Rw, dB) | ≈ 45 Rw(dB) | ≈45 Rw(dB) | ≈46 Rw(dB) | ≈47 Rw(dB) |
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FAQs
The Zero runs a 76 mm build-in depth with a 6-chamber profile and 3 sealing circuits (central seal included). Tested figures are a frame value of Uf 1.2 W/m²K and a window value down to Uw ≤ 0.87 W/(m²·K), earning an A+ energy rating. Weathertightness is rated watertightness 9A and air permeability Class 4.
The 76 MD Zero accepts glazing units up to 50 mm thick, so triple glazing fits comfortably. The hidden sash is paired with STV dry-bonding technology: the glass pane is bonded into the sash so the glazing itself stiffens the leaf. This stops the sash from sagging over time and supports the slim concealed-sash geometry without heavier reinforcement showing.
Leaf size is capped at 2400 mm tall and 1400 mm wide, so oversized panels fall outside its range. Security stops at RC2 burglary resistance, so it isn't a high-security solution. Acoustically it reaches up to 48 dB — good, but for the highest noise loads the deeper 88 MD (≈ 50 Rw dB) is the stronger pick.
Both share the 76 mm depth, 6 chambers and 3 sealing circuits. The difference is the concealed sash and the colder-rated value: Zero reaches Uw ≤ 0.87 versus the Xtrem 76 MD's ≤ 1.0 W/(m²·K). For a fully visible sash at a lower price, the Xtrem 76 MD (from €540) is the sibling; Zero (from €580) buys the hidden-sash look.
Viewed from outside, the sash is fully hidden behind the frame, giving the visual impression of a fixed window. Because the visible profile width is minimised, the daylight aperture grows for the same overall opening. It pairs the maximum glazing area with a single-pane appearance, which is why it suits contemporary minimalist villas.
The profile uses an advanced PVC available in a matte or glossy finish, so the concealed-sash facade can read as either understated or reflective. On exposure, the system is rated for wind loads up to Class C5, making it suitable for demanding facades while keeping its slim, single-pane exterior line.
