Product information

Product Description

Alitherm Heritage HD is designed to provide a solution where heritage projects require a larger opening sash size than offered by a standard Alitherm Heritage casement window.

The Alitherm Heritage range is designed to meet the needs of refurbishment and renewal projects, particularly in sensitive planning areas. Ideal for Victorian, Edwardian and Art Deco projects, its range of windows is proven in a wide range of renovation, refurbishment and heritage projects across the UK, providing a modern, high-performance replacement for traditional steel windows and doors.

Suitable for side hung, top hung and fixed windows, Alitherm Heritage HD features the same traditional aesthetics and slim sightlines the range is recognised for. The system incorporates Sterling hinges and new longer locking rods that allow opening sash sizes to be increased to meet the specified requirements of individual projects.

Our Alitherm Heritage ranges are available with a full suite of hardware options, with products specifically designed to match window furniture that is synonymous with Victorian and Art Deco styles – including ‘Monkey Tail’ and ‘Bulb’ options.

Technical Performance

Window Energy RatingB
U Value1.5 W/m2K (using 1.0 W/m2K centre pane)
Frame Depth52mm
Glass24mm, 28mm, 32mm & 42mm (depending on profile selection)
Document L CompliantYes
Security TestingPAS 24:2016

Design Limitations

Window Type

For sizes outside of these parameters, contact Smart Technical Support.

Design limitations tested to PAS 24 are noted below. Maximum design limitation outside of these dimensions are in the process of being tested.

Max Width (mm)
Max Height (mm)
Max Weight (kg)
Side Hung (PAS 24)600140040
Side Hung838*1750**55
Top Hung (PAS 24)1400130040
Top Hung1750**2500*180
Window Type

Design limitations tested to PAS 24 are noted below. Maximum design limitation outside of these dimensions are in the process of being tested.

Air Permeability Classification
Watertightness Classification
Wind Resistance Classification
Side Hung (PAS 24)Class 4Class 7AClass AE2400
Side HungTBATBATBA
Top Hung (PAS 24)Class 4Class 7AClass AE2400
Top HungTBATBATBA

*Subject to approval and further testing.

**New espagnolette required. Check availability with your supplier.

BrandAlitherm
MaterialAluminium Polyamide
Dual ColourYes
Thermally BrokenYes
NBS AvailableYes
WER RatingA+
Document L CompliantYes
KitemarkYes