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Alitherm Heritage Windows

Thin steel windows are still a popular idea in the UK, but improvements to building regulations over the years mean that it’s becoming more and more difficult to be approved for use. We believe the Heritage aluminium product offers a solution to this.

Thanks to a polyamide thermal break within the slim frame, the Alitherm Heritage can provide an overall Uw-value of 1.5 when paired with high-performance double glazing. The thermal break is 160x better than steel. Fantastic for renovations where a steel replacement in no longer an option, and perfect for stone mullions.

  • Aluminium Heritage build scaled
    Aluminium Heritage in bright blue
    Aluminium Heritage build 2
    Aluminium Heritage build 3 scaled
    Aluminium Heritage on stone building
    Aluminium Heritage build 4

  • In general, Alitherm Heritage provides us with a modern solution to a traditional steel window. Better thermal efficiency, no rust and a 40 year typical lifespan. There’s no need for re-painting, or any form of serious maintenance – simply wipe down with a warm, damp cloth.

    To best achieve a thin a uniform heritage look, outward-opening casements and doors are the best way to go, although there is a slightly wider tilt-turn frame available too. Handles are black as standard, and there are many others to choose from if you require a more art-deco style, or perhaps a traditional monkey-tail. No matter which handle you choose, it will connect to a multi-point locking system within the frame. Both casements and fixed lights have been tested to PAS24.

    Adding trickle vents for background ventilation are an option – either as an additional frame piece, or as an extra section inserted above the glass unit. If you experience a noticeable amount of humidity inside your home, we recommend fitting these.

    Alitherm Heritage is especially useful for replacing windows within thin stone mullions. The incredibly slim 47mm frame depth is perfectly suited to these, and including an odd-leg (or z-section) forms a neat cover over a small part of the angled external section of a stone pillar.


  • Typical Lifespan40 years
    Lead TimeTBC
    Best U-Value1.5 W/m2K (using sealed unit 1.0 W/m2K)
    FinishesSingle or dual colour, marine quality polyester powder coated aluminium as standard
    GlazingDouble, Triple, Obscure, Laminated, Toughened
    Maximum Sizes (Width x Height)
    Sizes based on single opener
    Side Hung: 700mm x 1400mm
    Top Hung: 1400mm x 1300mm
    Maximum Weight40kg
    Manufactured inUnited Kingdom
    Frame Depth47mm
    SecurityPas 24 Compliance on request
    Performance and DurabilityAir: Class 4, 600Pa
    Water: Class 9A, 600Pa
    Wind: Class AE, 2400Pa

  • Fixed Frame

    Fixed Frame Configuration

    Side Guided

    Side Guided Configuration

    Top Guided

    Top Guided Configuration