Individual Products

Rationel windows are unique and tailored to provide an array of options for new build or refurbishments, whatever the scale and scope of your project.

Modern Technology

Manufactured to Passive House standards, Rationel windows are thermally efficient solutions for those who want sustainability a core part of their project.

Perfect Combinations

If you’re looking to combine different materials and elements for different aspects of your design then all our ranges are more than up to the task. Don’t be limited by conventional thinking.

Professional Service

Ecotec takes great pride in the personal service we offer. If you don't know where to start, or you know exactly what you must have, we can help you from start to finish.

About Rationel

Ecotec Windows are an approved supply and installation partner for the manufacturer Rationel A/S who are a leading composite door and window company. Year after year we have seen technological developments allowing for the toughest, cleanest and most efficient composite doors and windows manufactured in Western Europe.

Ecotec Windows are proud of the association with Rationel with timber being our combined passion. Rationel have manufactured timber windows and doors since 1954 and will continue to do so for many years to come. In addition to their natural, beautiful look, windows and doors made of timber have a long service life and are sustainable and easy to clean and maintain.

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Shared Vision

Ecotec are proud to have been an approved partner for Rationel since 2014 with composite fenestration products being our combined passion. With modern and traditional products in an "open out" style their products are ideally suited to refurbishment and new-build projects alike.

Together we enable you to create the best home that you possibly can using Rationel window and door designs, constructed to PassiveHaus standard to increase thermal efficiency and reduce your carbon footprint. Make our combined vision a reality, we are on hand to provide service each step of the way.

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Download a brochure

Browse the extensive range of products we offer here in our catalogue. This is available to you as a PDF or in hard copy.

  • Photos & illustrations of all ranges

  • Specifications, finishes & colours

  • New technologies

  • Multiple glazing options

  • Guarantees & Warranties

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Enquiry Form


Our Showroom is open by appointment only, so we can give you an individually tailored viewing experience. Call 01226 885019 to arrange a time to suit you, even if this is outside normal office hours or at a weekend.