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Crittall® vs Smart Heritage Aluminium: A 2026 Comparison
Crittall® vs Smart Heritage Aluminium: A 2026 Comparison
Crittall® vs Smart Heritage Aluminium: A 2026 Comparison
Category: Buying Guide / Comparisons
Reading Time: 6 Minutes
📌 The Honest Verdict
- For Authenticity: Genuine Crittall® Steel wins (unmatched heritage).
- For Cost: Smart Heritage Aluminium wins (significantly cheaper).
- For Warmth: Aluminium wins (thermally broken profiles).
- For 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 when Francis Berrington Crittall began manufacturing metal frames in Braintree.
However, modern homeowners often face a dilemma: choose the authentic (but expensive and high-maintenance) steel, or the modern (cost-effective and thermal) aluminium alternative?
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 are a modern, aluminium-framed alternative (specifically the Smart Alitherm Heritage system). 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 (like the Sully Hospital example).
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)
~35 Years.
While durable, the risk of rust can shorten the effective life of the frames if neglected.
Smart Heritage (Aluminium)
~40+ Years.
Aluminium frames have the longest lifespan of any window material (Source: BRE).
🏆 Winner: Aluminium
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 steel 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) |
| Lifespan | ~35 Years | ~40+ Years |
| 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.
🏗️ Explore Our Aluminium Hub
Considering an upgrade? Explore our expert advice on doors, windows, and technical details:
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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