Windows - Energy Efficiency
After years of continual development into the ways of reducing heat loss from windows, we’ve come up with our new Ultra 2 gas filled sealed units – the most advanced yet.
Benefits of the new Ultra 2 include:
- Gives you a warmer home, lower bills and is better for the environment
- Recommended by the Energy Saving Trust for energy efficiency on our White Knight casement windows
- Insulating gas filling to cut heat loss by as much as 4% compared to an air filled sealed unit
- Improved 'soft coat' Low-E that lets in 10% more light transmittance compared with hard coat low emissivity glass
- A record low U-value of 1.2W/m²K - a 20% reduction compared with an Ultra argon filled sealed unit with K glass
Energy Efficiency and U-Values
We can usually tell when the central heating goes off on a cold winter's day. The radiators might have been on all morning but within an hour, we'll be reaching for sweaters.
Why? Where did all the heat go?
It simply passed through the fabric of your home. Through the walls, roof and floor. Through your doors and windows. How quickly it passes through them depends on their thermal performance. Commonly referred to as U-value, it shows the resistance to the flow of heat from inside your home to the outside. Quite simply, the more a wall or window resists this flow of heat the lower its U-value. For example, the U-value of a brick cavity wall* is about 1.6 W/m²K.
To enable customers to make the best choice the British Fenestration Ratings Council (BFRC) have introduced a ratings scheme to assess how energy efficient windows are. In addition to the U-value, the rating also measures a window's air tightness and its ability to allow solar gain which will help you keep warmer in winter. Tested windows are given a rating between A (best) and G (worst). Anglian White Knight windows have been certified by the BFRC and recommended by the Energy Savings Trust for energy efficiency.
* Cavity wall of U-value 1.6W/m²K is based on 100mm brick, 50mm cavity and 100mm brick. The U-value of an Anglian Ultra 2 sealed unit without the window frame is 1.2 W/m²K.