Smart® Alitherm® 400 Aluminium Windows
Slim, energy-efficient aluminium windows with flush or stepped sash options
Now with Flush or Stepped Sash Detail Option
How will Smart® Alitherm 400 Windows and Doors enhance my property?
Smart Alitherm 400 aluminium windows combine slim frames with excellent thermal performance, weather resistance and security. Available with flush or stepped sash detailing, the system provides a clean, contemporary appearance for replacement windows, extensions and new-build properties.
Manufactured in Britain by Smart Systems, Alitherm 400 uses an advanced polyamide thermal break to reduce heat transfer through the aluminium frame. Heronhurst supplies and professionally installs Alitherm 400 windows throughout Abergavenny, Monmouthshire and South Wales.
Building Regulations Compliant
Fully compliant with the relevant requirements of Approved Document L when supplied with a suitable glazing and window specification.
PAS 24:2022 Security Standards
Alitherm 400 windows are available in PAS 24:2022-approved configurations, providing enhanced resistance against forced entry. The exact security specification depends on the window style, hardware, glazing and configuration selected.
Unrivalled choice of colour
In addition to our 5 colour collections, we can match any Classic RAL colour
Alitherm 400 Casement Windows
Colour Options
We offer the Cotswold, Alchemy, Naturals and Sensations Textured collections plus the RAL colour palette throughout our Smart range of Aluminium Windows and Doors for an unbeatable range of colours, so you can find the perfect match for your home
Cotswold Colours
For traditional projects and conservation areas, the Cotswold colour range is the perfect choice with its selection of classic shades and warm tones. It provides the ideal finish for both new-builds and heritage properties
Sensations Textured Colours
Our range of metallic finishes that offers an unbeatable combination of style and durability. Popular for use in both architectural and restoration projects, the unique palette of colours opens up a whole new approach to aluminium doors
The Sensations range is resistant to corrosion with a durable, scratch-resistant finish
Our image reproduction doesn't show well the silver stipple texture built-in to every Sensations finish
Naturals Colours
Colour-rich coatings in a variety of shades and hues are available in our Naturals range, offering a stylish colour coating for your windows and doors
The Naturals range offers versatile shade options and full-protection for your home’s aluminium doors
Alchemy Colours
Alchemy is our premier range of finishes. An innovative, new solution; it is a hybrid of anodised and powder coating. The range combines the aesthetics of an anodised finish with the high level of protection and durability that a powder coat finish offers
Creations Colours
Perfect for designer doors, the Creations colour range is designed to offer a striking, distinctive solution. These elegant, timeless shades create an elegant, bespoke focal point for a home
Will my Smart Alitherm 400 Windows and Doors be energy efficient?
Smart Alitherm Windows and Doors are designed with energy efficiency in mind, incorporating advanced features that ensure they are an excellent investment for anyone looking to enhance their property’s thermal performance and reduce energy consumption
The windows and doors are designed with extended polyamide thermal breaks, a crucial feature for enhancing thermal insulation. These breaks effectively interrupt the thermal path through the door frame, reducing heat transfer from the inside to the outside of your property and vice versa. This means that during winter, heat stays inside, and in summer, it stays outside, maintaining a comfortable indoor climate without excessive use of heating or cooling systems
By installing Smart Alitherm 400 Windows and Doors, you contribute positively to the overall energy performance of your property. Not only do they help in reducing your energy bills by keeping your home warmer in the winter and cooler in the summer, but they also support your efforts in making your home more sustainable and environmentally friendly
Window and Door Configurations
Handles
Frequently Asked Questions
What sizes are available for Smart Alitherm 400 Windows and Doors?
Alitherm 400 windows and doors are made to measure. Minimum and maximum sizes depend on the opening style, glass specification, hardware and overall configuration. Our team will confirm whether your required sizes are suitable during the quotation and survey process.
Are Smart Alitherm 400 windows and doors suitable for commercial use?
Yes. Alitherm 400 windows and doors are suitable for residential and light-commercial applications, including homes, offices, schools and other appropriate commercial buildings.
How can I find a local installer for Smart Alitherm 400 Windows and Doors?
We offer an installation service for Smart Alitherm 400 Windows and Doors within the following counties: Monmouthshire, Powys, Newport, Blaenau Gwent, Merthyr, Cardiff, Hereford and parts of
Gloucestershire
How do I maintain my Alitherm 400 Windows and Doors to ensure longevity?
Maintaining your Alitherm 400 windows and doors involves regular cleaning of glass and frames with mild detergent, removing debris from tracks, and checking seals and hardware periodically to ensure everything is in good working order. This simple routine can significantly extend the life and performance of your windows and doors.
Close-ups
Recent Local Installations of Aluminium Windows and Doors by Heronhurst
Download our Window and Door Brochures
Technical
| Product Type | Maximum Width | Maximum Height | Depth |
| Alitherm 400 Side Opening Hung Casement Windows | 864mm | 1400mm | 70mm |
| Alitherm 400 Top hung Opening Casement Windows | 1400mm | 1400mm | 70mm |
| Alitherm 400 Fixed Windows and Screens | 2100mm | 2100mm | 70mm |
| Alitherm 400 Tilt and Turn Windows | 1200mm | 2100mm | 70mm |
| Alitherm 400 Single Door Open In | 1000mm | 2400mm | 70mm |
| Alitherm 400 Double Door Open In | 2000mm | 2400mm | 70mm |
| Alitherm 400 Single Door Open Out | 1000mm | 2400mm | 70mm |
| Alitherm 400 Double Door Open Out | 2000mm | 2400mm | 70mm |
Performance
| Product Type | U-value Double Glazed | U-value Triple Glazed | WER | GU Thickness Options |
| Alitherm 400 Side Opening Hung Casement Windows | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | A | 24,28,32,36,40 &45 |
| Alitherm 400 Top hung Opening Casement Windows | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | A | 24,28,32,36,40 &45 |
| Alitherm 400 Fixed Windows and Screens | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | A | 24,28,32,36,40 &45 |
| Alitherm 400 Tilt and Turn Windows | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | A | 24,28,32,36,40 &45 |
| Alitherm 400 Single Door Open In | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | B | 24,28,32,36,40 &45 |
| Alitherm 400 Double Door Open In | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | B | 24,28,32,36,40 &45 |
| Alitherm 400 Single Door Open Out | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | B | 24,28,32,36,40 &45 |
| Alitherm 400 Double Door Open Out | 1.4 W/m²K (1.0 W/m²K Centre Pane) | 1.1 W/m²K (0.7 W/m²K Centre Pane) | B | 24,28,32,36,40 &45 |
Maximum sizes and performance figures are subject to the selected configuration, glazing, hardware and current manufacturer specifications. Please contact us to confirm the requirements for your project.
As Approved Installers for Smart Aluminium Alitherm 400 Windows and Doors, we offer our dedicated survey and install service throughout South Wales including Abergavenny, Crickhowell, Usk, Monmouth, Brecon, Chepstow, Cwmbran, Newport, Cardiff and Merthyr areas and beyond
Made in the UK
Our Smart Aluminium Windows, Doors and Screens are individually made in the UK