Window Energy Ratings (WER) Scheme
Duration windows has been fully certified by the British Standards Institute (BSI) and fully registered with a Kitemark licence in respect of the Window Energy Rating Group Scheme. BSI is the National Standards Body of the UK, with a globally recognised reputation for independence, integrity and innovation in the production of standards that promote best practice. BSI is an approved independant agency that is reponsible for auditing our manufacturing process and systems. They have to ensure that we are in a position to fabricate and provide customers with a product, which is complient in the respect of Window Energy Rating Group scheme.
If you wish to find out more information or wish to enquire about our Premium Plus ‘A’ Rated Windows, please don't hesitate to contact us.
Many companies claim to have ‘A’ Rated Windows, always ask to see a WER rating scheme certificate / simulation certificates. Click to see our BSI certificate»
Please Note The Difference Between:
WER (Window Energy Ratings) - used to meet building regulation part L for the energy efficiency of windows, rated from A-G... and...
BREEAM (BRE Environmental Assessment Methods) - a green guide / standard for best practice for rating the sustainable / environmental performance in building and manufacture, rated A-G.
Why ‘A’ Rated Aluminium Windows?
- How much will you save on heating bills & gas emissions? (external link)
- Who are the Bitish Standards Institute (BSI)? (external link)
- Eco Products
- Aluminium Sustainability
| Aluminium ‘A’ Rated Window | Ordinary PVCu Window | |
| Awarded ‘A’ rating for energy efficiency |  |
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| Around a 10% reduction in heating bills | |
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| Increase in comfort due to less heat loss | |
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| Thin slim-line frame | |
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| Recyclable indefinitely | |
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| Resistant to corrosion | |
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| Low maintenance | |
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Why Use Double and not Triple Glazed Units?
- More glass on triple glazed units means more weight. Therefore you need either thicker frames and heavier duty hardware to take the extra load, or have smaller sashes.
- Triple glazed units suffer from reflections as you look through them. This is due to the extra middle glass pane - spoiling your views through your windows.
- Triple glazed units are far more expensive, due to the extra cost of one more sheet of glass, and the bigger frames needed to carry the load.
What Is An Window Energy Rating For?
Consumers are increasingly focusing on the energy efficiency of building products to reduce the amount of carbon emissions. The basic U value does not fulfill these requirements because it only aims to give a value for the insulation properties of a window. It only focuses on the and heat loss from the window and takes no account of the solar heat gain that windows are responsible for and how they can improve the overall energy efficiency of the house. The window energy rating scheme provides a very good idea of how environmentally friendly your windows are.
Windows are rated using an A to G scale, which symbolises the total energy efficiency of a product. Where an A-rated window is the highest rating in energy efficiency and a G-rated window has the lowest rating in energy efficiency.
- This rating allows ease of recognition by using the all familiar charts and labels.
- Widens choice, by allowing people to choose more energy efficient products for there own property.
- Allows people to contribute to the overall reduction in greenhouse gases.
- Energy rated windows could reduce heating and fuel costs by up to 10%.
- Rising fuel and heating costs reduces the payback time on fitting new energy efficient windows.
- A rated windows can have a Zero energy loss of a years cycle and can even add heat energy into a property through solar gain.
- C Rated windows have a 94% lower heat loss than an E rated window.
- It is required under the October 2010 building regulation that the lowest acceptable WER is a of C in order to comply with the building rgulations.
