Windows / Aluminium Windows / Alitherm Heritage
Alitherm Heritage Aluminium Windows
The smart solution for heritage applications — slim, steel-look sightlines with modern thermal performance and enhanced security, approved for listed building renovations and proven across Victorian and Art Deco refurbishment projects throughout the UK.
Who they are
Built by Smart Systems, part of the Corialis Group
Smart Systems has grown over forty years into the UK’s leading supplier of aluminium glazing systems, manufacturing from its own facility in Yatton with an in-house powder-coating line — keeping quality and lead times in-house rather than farmed out to a third party.
40+
Years established
No.1
UK’s largest aluminium extrusion manufacturer
Yatton
In-house factory & powder-coating
C2C
Cradle to Cradle Bronze certified
Why choose Alitherm Heritage
The steel window look, without the steel window problems
Approved for listed buildings & conservation areas
Already accepted by the London Boroughs of Islington, Camden and Tower Hamlets, Watford Borough Council and Essex County Council, plus Cadw, the Welsh Government’s historic environment service.
Signature slim sightlines
A modern, like-for-like replacement for traditional steel windows and doors, designed to keep the sightlines and profile proportions planners and conservation officers expect.
A ‘B’ Energy Rating
Polyamide thermally-broken profiles deliver a U-value of 1.5 W/m²K — polyamide’s thermal conductivity is around 160 times better than steel, cutting heat loss and condensation risk.
PAS 24:2016 enhanced security
Multi-point locking with face-mounted finger-thrown locking bolts as standard, tested to the enhanced security performance standard.
Heritage-style hardware
Monkey Tail, Bulb-End and Art-Deco window and door handles echo genuine Victorian and Art Deco ironmongery, finished to match.
Built to outlast steel
Aluminium doesn’t rust, so there’s no repainting or re-varnishing — just an occasional wipe-clean, with a typical 40-year lifespan against a steel window’s 35 (source: BRE British Research Establishment).
Styles & configurations
One heritage system, five ways to open it
Alitherm Heritage windows are built as a series of horizontal modules, stacked using couplers with a specially-designed drip bar between them — so a whole multi-part elevation can be specified in one consistent, steel-look system.
Fixed
Side Hung
Top Hung
Tilt & Turn
Pivot
Colours & finishes
An unrivalled choice of colour
Alitherm Heritage is powder-coated in-house across the same four Smart Systems colour collections as the rest of the Alitherm range — filter by collection, then click a swatch for a closer look. Dual-colour capability means the interior and exterior can run different finishes.
Request a painted sample of your chosen colour before making your final decision — screen colours are a guide only.
Get a Quote in this colourTechnical specification
Alitherm Heritage at a glance
| Material | Aluminium, polyamide thermally broken |
|---|---|
| Frame depth | 47mm |
| Thermal performance | U-value 1.5 W/m²K (1.0 W/m²K using sealed unit) · WER Band B · Document L compliant |
| Glazing options | 24mm, 28mm, 32mm & 36mm sealed units |
| Finish | Single or dual-colour marine-quality polyester powder coat as standard |
| Window styles | Fixed, Single or Double Sash Side Hung, Top Hung, Tilt & Turn, Pivot |
| Performance | Air Class 4, 600Pa · Water Class 9A, 600Pa · Wind Class AE, 2400Pa |
| Side Hung vent limits | 700mm max o/a width · 300mm min o/a width · 1400mm max o/a height · 40kg max vent weight |
| Top Hung vent limits | 1400mm max o/a width · 1300mm max o/a height · 275mm min o/a height · 40kg max vent weight |
| Security | PAS 24:2016 enhanced security performance · multi-point locking with face-mounted finger-thrown locking bolts as standard |
| Weather testing | BS 6375 Part 1:2009 — Resistance to Weather |
Figures above are Smart Systems’ own published performance data for Alitherm Heritage (smartsystems.co.uk/product/132/alitherm-heritage and Smart’s Alitherm Heritage brochure, ref. IMS250AHB.201804) — both agree on every figure used here.
Security & certifications
Tested, certified, and approved for heritage projects
- PAS 24:2016 approved – enhanced security performance
- Tested to BS 6375 Part 1:2009 for resistance to weather
- Document L compliant, WER Band B
- Accepted for listed building & conservation area projects by the London Boroughs of Islington, Camden and Tower Hamlets, Watford Borough Council and Essex County Council, plus Cadw, the Welsh Government’s historic environment service
- Manufactured by Smart Systems in Yatton, Somerset – Made in Britain, Cradle to Cradle Bronze certified
Ready to spec your Alitherm Heritage windows?
Get a price on your opening, in the style and colour you need.
Get a QuoteBuying on trade terms? Apply for a trade account →