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Energy efficient glass
The energy rating label runs from A-G with band E as the lowest level permitted for replacement windows. This generally requires a Low-E sealed unit.
Domestic extensions have to be band D or higher. This generally requires a Low-E Argon filled or warm edge spacer (Super Spacer or Enviro-TXN) sealed unit. New build can be up to band G, but only if the whole house meets other energy saving targets.
The Energy Saving Trust will allow the use of their logo for windows that achieve band C or higher. This generally requires a Low-E, Warm edge spacer and Argon filled as a minimum standard.
Guardian Low-E
This is a hardcoat glass, neutral in both reflection and transmission, providing crystal clear vision with no unsightly haze.
High light and solar heat transmittance – allowing the best use of natural lighting and beneficial solar heat gain. Uniform with no unsightly banding effects within the glass panel. Excellent thermal insulation – U values down to 1.4 W/m2K when gas filled, allowing energy saving requirements to be easily achieved, reducing heating costs.
As well as standard glass, laminated and tempered glass are also available to provide safety and security where needed.
Guardian Low-E energy efficient glass
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