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InteriorInterior
EnergySaver — Low E
Description

EnergySaver™ is an entry-level clear Low-E glass product designed for double-glazed windows. It lets plenty of natural light in while improving thermal performance helping keep spaces warmer in cooler months and more comfortable year round.

The Low-E coating allows light through but reduces heat loss, which can lower energy use and reduce heating needs. It is suitable for residential and commercial double glazing and can be toughened for added strength. 

Key Features
  • Low-E coating – Special coating lets natural light in while reducing radiant heat loss or gain, improving energy efficiency.
  • Year-round comfort – Helps keep indoor spaces warmer in cooler weather and more comfortable overall.
  • Energy efficiency – Can lower heating energy use by reducing heat loss through the glass.
  • High light transmission – Around ~77% visible light passes through, keeping spaces bright.
  • Toughenable – Can be toughened to be stronger and meet safety requirements.
  • Affordability – Positioned as an entry-level Low-E double glazing option.
  • Improved insulation vs standard glass – Reduces heat loss significantly compared with ordinary double glazing.
Scope of Use
  • Suitable for residential windows and doors, including houses and apartments.
  • Can be used in multi-story apartments. 
  • Appropriate for commercial windows and doors. 
  • Applicable in facades, sliding doors, overhead glazing and curtain wall systems. 
Limitations on Use
  • Available only in specific glass thicknesses (4, 5, 6, 8, and 10 mm)
  • Size limits: max. 4500x2700mm
  • Soft Low-E coating constraint: The soft Low-E coating must be sealed within an insulated glass unit (IGU) and cannot be used as single glazing, limiting where it can be applied. 
Other Performance Attributes
  • High light transmission 77% gives a high degree of neutrality in transmission and low reflection
  • An excellent U-value of 1.7 W/m²K

Visible Light: ( 4mm Clear // 14mm Argon // 4mm LightBridge 1.1 )

  • Transmittance: 77%
  • Outdoor Reflectance: 20%
  • Indoor Reflectance: 21%

Heat Gain:

  • SHGC: 74%
  • Shading Coefficient: 85%

Fading / Tdw ISO: 0.65 (blocks 31% of fading / UV energy)

Documents
BPIR: Insulated Glass Units (IGU)

2025

Care & Maintenance - Glass
Product Warranty
Product Warranty - Terms & Conditions
Viridian Glass DGU Low E Brochure

Viridian Glass is New Zealand’s leading glass supplier and processor. It delivers high-performance custom glass solutions for residential and commercial projects nationwide.

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