We Use The Best Performing Low E Glass On The Market


Double glazed windows play a key role in a home’s overall energy rating, as up to 25% of heating used can be lost through a double glazed window.

Many houses are unable to achieve even a D rating on the Home Information Pack scale.

For a home to achieve a C or above rating in the Energy Performance Certificate, the type of double glazing and window chosen is crucial and standard double glazing window will not be sufficient.
Heating accounts for 60% of energy used in the home. As such, windows have their own labelling system – under the British Fenestration Rating Council’s Window Energy Rating scheme.

Window Energy Ratings are measured on an A to G scale, as with the Energy Performance Certificate.

The thermal insulation properties of Low E double glazing window achieves by far the greatest Window Energy Ratings and, depending on their construction, can obtain an A, B or C grade on the WER scale. To illustrate the difference, 1m2 of Low E glass emits 91 kilos less of carbon dioxide per year than 1m2 of standard double glazing window.

At  Modern Glass we use the best performing Low E glass on the market, Planitherm TOTAL by Saint Gobain.

Further energy savings can be made by using warm edge ‘thermal break’ spacer bars. These warm edge spacer bars can reduce heat lost around the edge of the window by up to 65%.
As well as complying with legislation, the savings on heating that can be made by improving a home’s window energy ratings are substantial. By selecting the most energy efficient Low E windows (an A on the energy rating WER scale), a typical semi-detached home will reduce its heating bills by an estimated £9000 over 20 years compared with a standard double glazing window.