The EcoTherm SL casement door is designed around practicality and durability, using highest quality materials throughout. Its versatile design suits a broad range of projects – from modern homes to period properties – with easy operation, clean lines, and a timeless appearance that remains as relevant in twenty years as it does today. A perfect choice for homeowners and specifiers who demand both functionality and precision.
Full technical specifications for the EcoTherm SL casement door range – refer to the table below for standard product data.
| Product guidance – as standard | |
| Type | Entrance Door, single/double; Terrace Door, single/double; Paneled Door single/double. |
| Configuration | Inward-opening / Outward-opening |
| Frame | 56 x 102mm - for Double Glazed Scandi and 56 x 112 for Triple Glazed Scandi Plus doors. Manufactured using mortise and tenon joints, glued and mechanically fixed. |
| Product specification | |
| Material | Engineered redwood – Standard. Engineered hardwood, European oak. |
| Glazing | 28mm Double glazed unit of 4/20/4 Low-E – as standard for Scandi. 48mm Triple glazed, 4/18/4/18/4 Low-E – as standard for Scandi Plus. |
| Perimeter spacer bars | White warm edge perimeter spacer- as standard. Silver and black spacer optional. |
| External finish | Polyester powder coating. |
| Internal finish | Three coat spray applied factory finish using water-based Teknos micro-porous paint/stain. |
| Energy characteristics | Single Door U-value of 1.36 W/m²K using double-glazed units of 28 mm with a center U-value maximum of 1.1 W/m²K. Single Door U-value of 0.91 W/m²K using triple -glazed units of 48 mm with a center U-value maximum of 0.53 W/m²K. |
Download technical datasheets, performance data, and BIM files for specification and design use.
The EcoTherm SL casement door is a popular choice across a wide range of residential and commercial projects in Ireland, valued for its ease of operation, clean lines, and adaptable specification options. Available in both inward and outward-opening configurations, it brings practicality and natural light together in a single, well-resolved product.
The versatile design means the EcoTherm SL casement works equally well in contemporary homes and more traditional settings. Whether specified at width for a generous, light-filled opening or in a narrower configuration for a more considered entrance, the door accommodates a broad range of architectural briefs without compromise.
For homeowners and specifiers seeking a low-maintenance casement door, our aluminium cladding option provides a practical and long-lasting solution. The Aluclad system protects the engineered timber core against harsh Irish weather conditions, retaining its finish and colour for years without the need for repainting or retreatment.
The exterior cladding is available in a wide selection of colour options – applied as a durable polyester powder coat – while the interior retains the warmth of natural timber with a three-coat factory-applied Teknos finish. The result is a casement door that stands the test of time in both performance and appearance, representing a high security, high-quality choice for any project.
Here are answers to some of the most common questions about our EcoTherm SL casement doors – from glazing options to finishes and performance data.
Contact UsThe Scandi double-glazed casement door achieves a U-value of 1.36 W/m²K, while the Scandi Plus triple-glazed version achieves 0.91 W/m²K – making it a strong choice for energy-conscious projects across Ireland.
Yes. All EcoTherm SL casement doors are available in a wide range of colours. The external aluminium cladding is powder coated, and the internal timber finish is factory-applied using Teknos micro-porous paint or stain.
The Scandi uses a 28mm double-glazed unit, while the Scandi Plus uses a 48mm triple-glazed unit – delivering a significantly lower U-value of 0.91 W/m²K for projects requiring higher thermal performance.
The Scandi Plus triple-glazed casement door, with a U-value of 0.91 W/m²K and centre pane U-value of 0.53 W/m²K, is well suited to low-energy and Passivhaus-standard projects across Ireland.
EcoTherm SL casement doors are manufactured using engineered redwood as standard, with engineered hardwood and European oak available. All frames use mortise and tenon joints, glued and mechanically fixed for precision and durability.
A complete service
from design to installation.
We purchased a combination of Alu-Clad windows, Lift & Slide doors and entrance glazing from Zyle Fenster for our family home.
Every member of the team was knowledgeable, approachable and highly professional. Manufacturing quality is outstanding and the installation was carried out with real attention to detail. Even after completion, they followed up to ensure everything was perfect.
It’s rare to find a company that delivers exactly what they promise. We would happily recommend Zyle Fenster to anyone building or renovating a home.
Seán & Emma R. – County Meath
Our architect specified Reynaers aluminium systems and recommended Zyle Fenster for the supply and installation.
The large glazing panels have completely changed the feel of the house while maintaining excellent thermal comfort throughout the winter. The installers were meticulous and every junction was finished beautifully.
It’s refreshing to work with a company that genuinely cares about delivering a quality result.
Niamh F. – County Clare
We chose Schüco aluminium windows and doors through Zyle Fenster for our contemporary home.
Everything about the experience was professional. From technical advice through to installation, the team demonstrated real expertise. The slim profiles look fantastic and the quality of the finish is exactly what we hoped for.
A premium product installed by a premium company.
David L. – County Waterford
Our conservation project required slim glazing without compromising performance, and Zyle Fenster recommended their vacuum glazed timber sash windows.
The result is outstanding. The traditional appearance has been preserved while the improvement in warmth and noise reduction is remarkable. You simply wouldn’t know they contain such advanced technology.
Excellent communication, excellent installation and an exceptional product.
Michael & Sarah K. – County Kilkenny
Finding authentic timber sash windows that also met modern energy standards wasn’t easy until we found Zyle Fenster.
The finished windows perfectly suit our Victorian home while dramatically improving comfort. They operate beautifully and the attention to detail is outstanding.
The installation team treated our home with great respect and left everything spotless each evening. We have received countless compliments from neighbours.
Margaret C. – Dublin
We wanted a large glazed feature overlooking the garden while still achieving excellent thermal performance. The timber curtain wall supplied by Zyle Fenster exceeded every expectation.
The craftsmanship is remarkable and the amount of natural light it brings into the house is incredible. Our architect was particularly impressed with the technical knowledge and attention to detail shown throughout the design process.
Professional, reliable and extremely high-quality workmanship.
Patrick D. – County Wicklow
Whether you are an architect specifying for a new project, a self-builder planning your custom home, or a developer working to a programme, our team is here to help. Get in touch for technical advice, product information, or to request a quote.
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