A superior technology designed to minimise energy loss through your windows

Benefits of Thermoflex Warm Edge Spacer and Energy efficient windows for Specifiers, Architects and Builders
Manufacture superior glazing units with Thermoflex warm edge spacer
Thermoflex Warm Edge Spacer for Window Installers and Fabricators
Homeowners can reduce heating bills with Thermoflex energy saving windows

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Building Regulations and Window Energy Ratings

UK Building Regulations

UK Building Regulations outline standards for thermal efficiency that must be met for all new and replacement windows. A minimum u-value of 1.6 Wm²K (whole window value), or a Window Energy Rating (WER) of A, B or C is required – although proposals for the future mean that this may change to a minimum u-value of 1.4 Wm²K or Window Energy Rating B or above.

A combination of different factors contributes to improved thermal efficiency in a window unit. Calculations for energy ratings therefore take these factors into account, and consider the glass type, the components used in the sealed unit, the structure, and the window frame.


Thermoflex is a Passive House certified component - click here.

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Currently Awaiting Updated Data Sheet

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