Choosing the right windows is one of the most crucial decisions when building or renovating a home, as it can impact your living comfort for decades to come. As experts in window systems, we’ve prepared a detailed MB77 HS review to help you make an informed decision. The MB-77HS system is one of the most advanced solutions available in 2025, but does it truly deliver on all the manufacturer’s promises?
Over the past three months, we’ve tested this HST window under various conditions, examining every aspect of its performance – from energy efficiency to user comfort. In this comprehensive analysis, we’ll examine the technical specifications, configuration options, real-world energy performance, and safety features of the MB-77HS system. Our goal? To help you decide whether this solution is worth its price tag and if it’s the right fit for your home.

Technical Specifications and Innovations

Examining the technical specifications of the MB-77HS system, we notice impressive structural parameters. The system offers a frame depth of 174 mm in the 2-track version and 271 mm in the 3-track variant. The 77 mm sash depth allows for glazing packages ranging from 13.5 to 58.5 mm.
Here are the key technical parameters of the system:

What particularly caught our attention during testing was the system’s construction capabilities. The MB-77HS allows for impressive glazing installations up to 3.2 m in height and 3.3 m in width, with a maximum sash weight of 600 kg.
Among the innovative solutions, we highlight:

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• Proper preparation of the wall opening maintaining 90° angles (diagonal difference tolerance up to 1 cm)
• Use of load-bearing thresholds ensuring stable load transfer
• Application of appropriate steel anchors or stainless steel bolts

The system also offers advanced customization options, including:

Parameter	Value
Water tightness	Class 9A, EN 12208
Air permeability	Class 4
Wind resistance	Class C4/B4