The U-value is one measure of how well your windows are keeping your heat in. Low-emissivity coatings on glass which offer heat insulation normally define their efficiency using the U-value. The lower the U-value the better the insulation.  

There are a number of products available which are designed to improve the thermal insulation of homes, however, without doubt the most well-known energy-efficient glazing products out Pilkington K Glass™ Range. (Pilkington K Glass™, Pilkington K Glass™ S and Pilkington K Glass™ A) These unique energy-efficient glass products are still one of the UK’s best-selling low-emissivity glass products.  

There is also a measure of the overall energy efficiency of your windows called the Window Energy Rating (WER). Measured on an A++ to G scale (with A++ being the best) and using the labelling system we are all used to seeing on fridges and washing machines, the WER takes account of how well the window utilises free heat energy from the sun as well. 

A window with a rating from C up to the top level which is A++, meets the latest Government regulations concerning the energy efficiency of homes. All the products from our low-emissivity glass range, including Pilkington K Glass™, the UK's most well-known low-emissivity coated glass, will help a window to achieve these high levels. Ask your window installer for more details. 

For more information click to view our full Thermal Insulation Range.
To find a supplier click here.