A+ Rated Windows

Welcome to our post on A+ Rated glass, the latest addition to the window energy rating (WER) energy efficiency scale for uPVC windows. Below we explain the difference between an A-Rated window and an A+ Rated uPVC window. Contact us for more information on our high quality trade uPVC Windows and Doors.

A+ Window Energy Rating

The window energy rating for uPVC windows is calculated on a scale from A-E much like electrical appliances that you may find in your home, the only difference is the way in which the rating is measured. For uPVC windows a range of factors will alter the rating including heat gain (g-value), thermal loss (u-value), air leakage and thermal conduction.

In 2013 the BFRC announced the latest criteria for window energy ratings, recognising A+ rated windows. The change came to help consumers as there was a vast difference in performance in A-rated windows. A+ rated windows will typically gain heat to a property rather than lose heat by having a low u-value, meaning that they retain the internal thermal energy and will also gain heat through solar energy by using low-iron low-e coatings.

A+ Rated uPVC Windows

An A+ rated uPVC window can be achieved in many formats, typically a thermal outer frame and thermally reinforced opening sashes will be used as well as warm edge spacer bars within the glass units. Then a high performance glass will be specified, for double glazed units a double soft coat low-e glass unit configuration will achieve an overall A+ rating.

Triple glazing can also be used to further reduce the u-value of a window and increase the thermal properties of the window installation.

At AWM Windows we manufacture high quality uPVC windows and supply to the trade and public in England, Wales and Scotland. Contact us for more information or call us for an official supply quotation.

WER Scale

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