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Lotus is proud to be a member of WERS and have certified energy ratings for our Glas-Stax Frameless and Fineframe products with U Values as low as 3.4. These ratings can be used in building energy efficiency modelling software* which will help you select the best Lotus system for your needs. WERS is the Windows Energy Rating System and is administered by the Australian Windows Association, and is the standard by which the energy efficiency of all windows is rated, comparing the rated product (eg: Glas-Stax Frameless or Fineframe) against a ‘standard’ window. The key measures are 'U' and 'Solar Heat Gain Coefficient' (SHGC). U relates to the amount of energy required to heat or cool internal living spaces to keep them at comfortable levels, given a certain thermal performance of a window. SHGC measures the amount of radiant heat energy that is transferred through the glass and frame of a window system. Residential certification can be found here. Commercial certification can be found here. Certificates attesting to the thermal performance of Glas-Stax can be downloaded below, or from wers.net. * NatHERS, FirstRate as well as Section J of the BCA WERS Certificates for Glas-Stax walls
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