Energy-efficient steel windows: W20 TE’s energy savings and compliance edge

• 4 June 2025
• News

In the evolving landscape of modern architecture, the quest for energy-efficient steel windows has never been more compelling. For those who value elegance, durability and the seamless integration of design with performance, the W20 TE range from Crittall Windows stands as a testament to what is possible when innovation meets heritage craftsmanship.

A new era of energy efficiency in steel windows

Steel windows have long been admired for their robust construction and classic aesthetics. Yet, with the introduction of advanced technologies such as thermal break frames and high-performance double glazing, the W20 TE range redefines expectations for energy efficiency in both residential and commercial buildings.

The slim sightlines and large panes of glass allow for abundant natural light, while a novel profile adaption creates a  thermal barrier that significantly reduces heat loss, keeping interiors comfortable year-round.

How does W20 TE technology deliver superior thermal performance?

The secret lies in the synergy between the slim steel frames and the thermally enhanced  profiles. These engineered steel frames act as a robust thermal barrier, minimising heat transfer and preventing cold energy from infiltrating the home. The result is a window system that supports exceptional strength and modern performance, all while maintaining the narrow sightlines and minimal maintenance that have made steel windows a popular choice for heritage properties and modern homes alike.

The W20 TE’s advanced glazing options further contribute to its thermal efficiency, offering homeowners, architects and interior designers a solution that meets stringent compliance requirements without compromising on aesthetic appeal.

Sustainability, longevity and the circular economy

Steel windows such as the W20 TE are inherently durable and recyclable, embodying the principles of the circular economy. Their longevity and resistance to corrosion mean they require minimal maintenance over their lifetime, making them a great choice for those seeking both luxury and sustainability.

The robust construction ensures that W20 TE windows and doors stand the test of time, even in challenging environments like London, where exposure to moisture and air leaks can be a concern. With a design life that far outstrips alternatives such as aluminium, these steel frames offer peace of mind for the long run.

Versatility and design options for every vision

The W20 TE range is celebrated for its versatility. Available in a wide range of products, including casement and internal doors, these steel windows can be tailored to suit both traditional aesthetics and contemporary design ambitions. The large panes of glass and slim profiles create a sense of openness, allowing for seamless integration with outdoor spaces and interiors alike. Homeowners and designers can select from a palette of colours to achieve the perfect look for any project, whether it’s a heritage property or a cutting-edge commercial building.

Key benefits of steel: Why W20 TE stands out

Exceptional strength and durability

Engineered to withstand the elements, W20 TE steel windows are built for the long run.

Superior insulation and thermal efficiency

The thermally enhanced profiles  and double glazing minimise heat loss and condensation, reducing energy bills and improving comfort.

Elegant, narrow sightlines

The slim steel frames allow for more glass and more natural light, enhancing the sense of space and luxury.

Minimal maintenance

The robust construction and resistance to corrosion make these windows a practical choice for busy homeowners and property managers.

Compliance and sustainability

W20 TE meets the latest regulatory standards, supporting sustainability goals and offering a responsible choice for environmentally conscious consumers.

A question of choice: What makes W20 TE a great investment for modern homes?

W20 TE combines the best of both worlds. Its advanced steel frame technology, thermally enhanced profilesprofiles and high-performance glazing deliver outstanding energy efficiency and insulation. This means lower energy bills, improved comfort and a reduced environmental footprint.

For architects, developers and homeowners alike, W20 TE is a forward-thinking solution that marries timeless elegance with modern performance.

Embrace the future of design and sustainability with W20 TE

For those seeking energy-efficient steel windows that excel in both form and function, the W20 TE range from Crittall Windows is the definitive choice. Its blend of slim sightlines, robust construction and advanced thermal performance makes it a popular choice for heritage properties, luxury residences and commercial spaces across the UK.

Explore the full range of products and discover how W20 TE can transform your project – connecting the past with the future, one pane of glass at a time.

Contact Crittall Windows to learn more about the W20 TE’s energy-saving benefits and how it can help you meet your sustainability and compliance goals. Let your next project be defined by elegance, durability and responsible innovation.