Kömmerling Xtrem 76 AD takes the well-loved 76 series a step further, engineered expressly for sun-drenched regions like Spain. Its PVC formula contains dedicated S-class stabilizers that keep the profile from warping in intense heat. With a 76 mm installation depth, the system delivers outstanding insulation that keeps interiors cool and trims air conditioning bills.
Slim frames admit more Mediterranean daylight, while two circuits of premium sealing dependably shut out dust and noise. This is the "gold standard" for those wanting German quality tailored to the Spanish sun.
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 versatile pick engineered for the Spanish sun. Its dedicated PVC formula brushes off high temperatures and won't yellow as the years pass — the "sweet spot" for anyone after reliable German windows who'd rather not pay for features they'll never use.
Core system specifications:
Glazing and infill choices:
Maximum size limits:
Tested performance values:
Documentation
A versatile pick engineered for the Spanish sun. Its dedicated PVC formula brushes off high temperatures and won't yellow as the years pass — the "sweet spot" for anyone after reliable German windows who'd rather not pay for features they'll never use.
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 Xtrem 76 AD stacks up against the closest matches from other brands.
| Specification | Kömmerling Xtrem 76 ADThis profile | WDS 76 MD (76 mm) | Rehau Synego | Veka Softline 82 |
|---|---|---|---|---|
| Brand | Kömmerling | WDS | REHAU | VEKA |
| 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) | ≤ 0.9 | 0.92 | 0.94 | 1.0 |
| Sound (Rw, dB) | ≈ 44 Rw(dB) | ≈45 Rw(dB) | ≈46 Rw(dB) | ≈47 Rw(dB) |
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FAQs
It runs a 76 mm build-in depth with a 5-chamber profile and an AD twin-circuit (two co-extruded seals). The measured frame value is Uf 1.0 W/m²K, with whole-window Uw ≤ 1.1 W/(m²·K) and energy class A. A reinforced steel core sits inside to offset thermal expansion when fitting dark laminated colours.
The 76 mm depth opens the glazing rebate to up to 50 mm, enough for a robust double-chamber insulating unit. Kömmerling recommends pairing it with a selective glass such as Guardian Sun so solar gain is reflected rather than absorbed — the practical route to its ≈ 44 Rw (up to 46 dB) acoustic and Uw ≤ 1.1 thermal figures.
Stay within a tallest leaf of 2400 mm white / 2300 mm coloured and a widest leaf of 1500 mm. Tested classes cap it at air permeability Class 4, watertightness E2250, wind load C5 and burglary resistance RC2. For larger spans, heavier sashes or higher security you would step up to a different system.
No. At Uw ≤ 1.1 W/(m²·K) and Uf 1.0 it is class A but not passive-house territory. For markedly lower values you would move to the Xtrem 76 MD (≤ 1.0), the 76 MD Zero (≤ 0.87) or the 88 mm 88 MD (≤ 0.72). The 76 AD is the efficient mainstream pick, not the ultra-low-energy ceiling.
Both share the same 76 mm Xtrem PVC body and 50 mm glazing, but differ in chambers and sealing:
The Xtrem compound is an S-class PVC with raised titanium dioxide content to shield against intense sun, so the profile resists yellowing and embrittlement and its AD seals resist sun-drying. Dark laminated finishes run hotter, which is why the frame carries a reinforced steel section to absorb that thermal expansion and keep the sash dimensionally stable.
