Warm-a-Glass, Double Glazing, Pilkington K, low emissivity, Low E

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Windows Today are pleased to introduce a new type of double-glazed sealed unit - Warm-a-Glass™

Looking for a new windows and doors? uPVC windows, aluminium windows, sash windows, patio doors, porches. All Shapes, All Sizes. To request your free brochure click here

Warm-a-Glass™ construction uses Pilkington K low emissivity coated glass with integral dual sealed thermally broken spacer bar to create thermally efficient double glazing units. The unique design of the spacer and the material used reduces the hot or cold temperatures from transferring to the inside. Typical U-values (Wm2K) of 1.7 or 1.4 when argon filled is achieved.

Other Information:

Decorative Glass

Detail illustration of integral dual sealed thermally broken spacer bar

Glazing Type Cavity Filling U-value (Wm2K)
Double Glazed Annealed Glass Air 1.7
Double Glazed Annealed Glass Argon 1.4
U-values quoted for Warm-a-Glass™ are computer simulations supplied by Azon USA inc. usings NFRC environmental conditions for North America. Outside temperature = -18°C Indoor temperature = +21°C. Wind speed 15mph (24 kph). Based on 4mm glass with 12mm cavity.
Glass Weight
Double Glazed Units with 12 mm cavity Weight (kg/m2)
4 - 12 - 4 20
6 - 12 - 6 30
10 - 12 - 6 40
12 - 12 - 6 45


  • Designed specially to reduce heat loss through glass
  • Highly effective Pilkington K low emissivity glass (emissivity less than 0.2)
  • Pilkington K Low emissivity coating allows the free shortwave energy from the sun to enter the building, but acts as a barrier to the escape of expensive longwave energy from internal heat sources
  • Unique spacer bar works like a thermal break decreasing the thermal transfer from outside air to the inside of the room and alters the condition in which condensation normally occurs thus reducing significantly the occurence of moisture forming on the glass
  • Warm-a-Glass™ provides excellent thermal insulation characteristics by reducing heat loss by 30% over ordinary double glazing
  • Warm-a-Glass™ can be combined with solar glass to offer full environmental control solutions
  • Insulating units incorporating Warm-a-Glass™ are as efficient as triple glazing and can achieve U values of 1.5W/m2K
  • Warm-a-Glass™ can be combined with solar control glasses to offer full environmental control solutions
  • Neutral colour in transmission and reflection
  • Larger windows can be specified in domestic and commercial
  • Spacer bars available in 3 colours - gold, bronze and silver

Our contractors offer a wide range of glass options

Looking for a new windows and doors? uPVC windows, aluminium windows, sash windows, patio doors, porches. All Shapes, All Sizes. To request your free brochure click here




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