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Crittall® vs Smart Heritage Aluminium: A 2026 Comparison
Crittall® vs Smart Heritage Aluminium: A 2026 Comparison
Category: Buying Guide / Comparisons
Reading Time: 6 Minutes
| Authenticity | Genuine Crittall® Steel wins. |
| Cost | Aluminium Crittall style windows win (much cheaper). |
| Warmth | Aluminium wins (thermally broken profiles). |
| Maintenance | Aluminium wins (no rust, no painting). |
While Smart Heritage aluminium windows are a relatively modern innovation, the style they replicate has been around for over a century. Genuine Crittall® windows span three centuries of architecture, starting in 1884.
However, modern homeowners often face a dilemma: choose the authentic (but expensive and high-maintenance) steel, or the modern, cost-effective replacement crittall windows made from aluminium?
Table of Contents
1. The Difference at a Glance
Crittall® Windows are the genuine article, made from steel since 1884. They are the authentic choice for the heritage, industrial, and Art Deco look.
Smart Heritage Windows (often called Smarts Heritage) are a modern, aluminium-framed alternative. They are designed to closely replicate the slim profiles of steel but with the benefits of modern aluminium construction.
2. Head-to-Head: The 4 Rounds
Performance Battle
Crittall® (Steel)
Conductive Material.
Steel naturally conducts cold. Older units often suffer from condensation and heat loss.
Smart Heritage (Aluminium)
Thermally Broken.
Uses polyamide breaks (160x better insulation than steel). Can save ~£95/year in fuel costs.
🏆 Winner: Aluminium (Minimises condensation & heat loss)
Crittall® (Steel)
Prone to Rust.
Requires regular painting and maintenance, especially in coastal areas.
Smart Heritage (Aluminium)
Wipe-Clean Only.
Powder-coated aluminium never rots or rusts. Ideally suited for coastal or harsh environments.
🏆 Winner: Aluminium (Fit and forget)
Crittall® (Steel)
Premium Price.
A bespoke, labour-intensive product that commands a high price tag.
Smart Heritage (Aluminium)
Cost Effective.
Offers virtually the same “heritage look” for a significantly lower investment.
🏆 Winner: Aluminium
3. Why Choose Alitherm Heritage?
At KJM, we have the perfect solution: the Smarts Alitherm Heritage aluminium window and door system. This system has been carefully designed to closely replicate the proportions and detail of an original Crittall frame.
- Slim Profiles: Dimensions specifically designed to replicate traditional crittall aluminium windows.
- Colour Choice: Powder-coated so they can be prefinished in any RAL colour – available in single or dual coloured marine quality powder coat.
- Authentic Hardware: Available with “Monkey Tail” and “Bulb” handles to match Victorian and Art Deco furniture.
- Versatile Glazing: The system can accommodate sealed units from 24mm to 36mm thick.
4. Features Comparison
| Feature | Crittall® (Steel) | Smart Heritage (Aluminium) |
|---|---|---|
| Material | Genuine Steel | Thermally-Broken Aluminium |
| Cost | Premium / High Cost | Cost-Effective |
| Thermal Efficiency | Lower (Steel is conductive) | Very High (Polyamide break) |
| Maintenance | Higher (Prone to rust) | Very Low (Wipe-clean) |
| Best For | Strict Preservation Areas | Renovation & New Build |
5. Frequently Asked Questions
Yes. The Smart Alitherm Heritage system was designed specifically for refurbishment and renewal projects. Its slim profiles closely replicate traditional steel frames, making it a popular choice for conservation areas, Victorian, and Art Deco renovations.
Crittall Windows are the genuine article, made from steel since 1884. Smart Heritage Windows are a modern aluminium alternative designed to look like steel but offer better thermal performance and lower maintenance at a more affordable price point.
Smart Heritage Aluminium is significantly more cost-effective. Genuine steel is a premium, bespoke product that is labour-intensive to fabricate. Aluminium offers a similar aesthetic for a lower investment.
Absolutely. The Alitherm Heritage range comes with a full suite of period-accurate hardware, including “Monkey Tail” and “Bulb” handles, to ensure the windows look authentic.
Mark Pearce is a highly experienced specialist in the double glazing industry, having built his knowledge from the ground up through hands-on experience in installation, manufacturing, sales, and business management. Beyond his role at KJM, Mark is a keen blogger, writer, and traveller, often sharing insights on the latest innovations in the home improvement industry.
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