We supply both. This is what the published figures actually say about thermal performance, security, acoustics and sightlines — across all 13 window systems in our range.
Both are European system platforms of the same tier, both are engineered to the same European standards, and both are supplied by us. Where they differ is in emphasis.
On published frame Uf values, the three best systems in our range are Schüco: AWS 90.SI+ at 0.71, AWS 90 BS.SI+ at 0.8 and AWS 75.SI+ at 0.9 W/(m²·K). The best Reynaers figure is MasterLine 10 at 0.99.
On very slim sightlines, Reynaers SlimLine 38 exists precisely for steel-look profiles and has no direct Schüco counterpart in our range — it accepts a frame Uf of 1.9 in exchange.
So the useful question is not which brand is better, but which requirement leads: lowest heat loss, or narrowest frame?
All values are frame or system figures published for the individual systems. They describe profiles — not a finished window in your opening.
| Criterion | Schüco | Reynaers |
|---|---|---|
| Best published frame Uf | AWS 90.SI+ — 0.71 W/(m²·K) AWS 90 BS.SI+ 0.8 · AWS 75.SI+ 0.9 | MasterLine 10 — 0.99 W/(m²·K) MasterLine 8 1.0 · EcoSystem 50 1.6 |
| Burglar resistance | Up to RC 3 (AWS 75.SI+, AWS 90.SI+, AWS 90 BS.SI+) RC 2 on the concealed-sash and Panorama Design systems | RC 2 to RC 3 (MasterLine 8, Concept System 77) WK 2 to WK 3 on MasterLine 10 · additionally PAS 24 |
| Acoustics | Up to 49 dB (AWS 90 BS.SI+, AWS 75.BS.SI+ WoodDesign) Single-figure values | Up to 47 (−2; −7) dB (SlimLine 68) Published with spectrum adaptation terms |
| Slim sightlines | Concealed sash on AWS 75.BS.SI+ — 66 mm exterior face width Panorama Design on AWS 75 PD.SI | SlimLine 38 — steel-look profiles, no Schüco counterpart in our range Accepts Uf 1.9 in exchange |
| Range in our program | 6 window systems AWS 75.SI+ · 75.BS.SI+ · 75.BS.SI+ WoodDesign · 75 PD.SI · 90.SI+ · 90 BS.SI+ | 7 window systems MasterLine 8 · 10 · SlimLine 38 · 68 · Concept System 59Pa · 77 · EcoSystem 50 |
| Non-insulated option | Not part of our window range | Concept System 59Pa — for interior and specific applications where thermal separation is not required |
When the specification is driven by energy performance, the Schüco AWS 90 family gives you the lowest published frame values in our range.
For renovation, heritage work or a deliberately industrial look, Reynaers SlimLine is the platform built for it.
Where slim sightlines and low heat loss both matter, the concealed-sash systems are the compromise worth looking at.
The thermal figures in this comparison are frame Uf values. Uf describes heat transfer through the frame profile. Uw describes the complete window, including the frame, glass and heat transfer around the glass edge. For a useful comparison, use the same window size, opening type, glazing and spacer. A change in glass-to-frame proportions can affect the result; a larger fixed window does not automatically have a better Uw.
For a U.S. project, confirm the rating method and units required by the specification. A European Uw value is not automatically an NFRC-rated U-factor. NFRC certification independently verifies product energy performance. Ask for the applicable product documentation and compare whole-window performance alongside the other project requirements. Our thermal-break guide explains the frame and glazing terms.
Neither brand is better across the board. On published frame Uf values the top three systems in our range are Schüco — AWS 90.SI+ at 0.71, AWS 90 BS.SI+ at 0.8 and AWS 75.SI+ at 0.9 W/(m²·K). For very slim, steel-look sightlines Reynaers SlimLine 38 has no direct Schüco counterpart in our range. The right choice follows the requirement, not the badge.
The lowest listed frame Uf in our current comparison is 0.71 W/(m²·K) for Schüco AWS 90.SI+. That gives you a frame-level starting point. To choose between Schüco and Reynaers for your opening, compare whole-window performance at the same dimensions, opening type, glazing and spacer specification. The result also needs the rating method required for your project.
Yes. Schüco AWS 75.SI+, AWS 90.SI+ and AWS 90 BS.SI+ are specified up to RC 3. On the Reynaers side, MasterLine 8 covers RC2 and RC3, MasterLine 10 covers WK2 to WK3 and Concept System 77 covers RC2 to RC3. Reynaers additionally publishes PAS 24, the British security standard, which can matter for UK-influenced specifications.
Reynaers. SlimLine 38 is built specifically for narrow steel-look profiles and accepts the higher frame Uf value of 1.9 W/(m²·K) that comes with it. There is no equivalent Schüco system in our range. Where slim sightlines and thermal performance both matter, Schüco AWS 75.BS.SI+ offers a concealed sash with a 66 mm exterior face width at Uf 1.3.
Yes, and it is common. Hardware, seals and profile geometries differ between the platforms, so units are not interchangeable, but there is nothing that prevents using one brand for windows and another for sliding or façade elements within the same building. We supply and calculate both.
Compare the same measurement and test basis. Frame Uf values and whole-window Uw values describe different things, and profile combinations affect the result. Use matching window sizes, opening types, glazing and spacers. For acoustics, check the stated Rw value and any C/Ctr correction terms together. For a U.S. specification, verify the applicable U-factor documentation and units before treating two published numbers as equivalent.
Send us your opening sizes and requirements. We calculate the Schüco and the Reynaers option side by side — with real Uw values, not brochure figures.
