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Our super low



Our Optima system can achieve a U-value of 0.8W/m2K or an A++ banded rating, but we understand that every customer is different and that flexibility is important. That’s why Profile 22 systems enable the fabrication of windows to any required Window Energy Rating. Quite simply, we offer more choice than our competitors, enabling you to satisfy any customer’s requirements.


What is a Window Energy Rating (WER)?

Window Energy Ratings provide a benchmark for comparing the energy efficiency of different window systems. The rating is a single number that measures a window’s overall energy performance. Building regulations currently stipulate a minimum requirement of ‘C’ (or a U-value of 1.6 W/m2K) for all window installations.

It is calculated by measuring the energy flow through a standard window (1.23m x 1.48m) and takes three variable factors into account:


The heat transmitted into the building through the glass from the sun (solar gain)

The heat loss from the building through thermal transmittance of the window components 

The heat loss resulting from air leakage through the weather seals


The energy efficiency of a window is shown by the widely-recognised Window Energy Rating.

For more details on energy efficiency and how to achieve the best possible energy rating contact us.

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