The Ultimate Energy Window

What are Window Energy Ratings?

Air losses (Negative)

Inside

Warm air leaks out through the window

Solar heat interior

Solar heat from outside

Outside

Solar heat gain (Positive)

Outside

Inside

Solar heat is reflected, absorbed and transmitted

Solar heat is reflected, absorbed and transmitted

Thermal losses (Negative)

Outside

Inside

Thermal losses from convection, conduction and radiation

Radiation

Thermal losses from convection, conduction and radiation

Convection

Conduction

Conduction

The Window Energy Ratings were developed by the British Fenestration Ratings Council (BFRC). The main benefit for consumers is that it allows them to compare the energy efficiency of different products with ease. It uses the already recognisable format of the A to G scale found on fridges, freezers, washing machines etc.

Because the Government are committed to reduce the levels of carbon dioxide emissions, and as window heat loss can account for up to 30 per cent of the total heat loss from a house, replacement windows are now energy rated. This will help to reduce harmful CO2 emissions and help cut the cost of heating bills.

Based on the results, windows are then rated from A to G with
A-rating being the most thermally efficient.
The New Ultimate Energy Saving Window surpassed all tests and achieved one of the industries highest ratings with an A+10 certification.

How is a window energy rated?
Ultimate window profiles along with the glass sealed unit specification are fed into a computerised simulation test to measure:-

1) Solar heat gain
2) Thermal losses
3) Air losses