Energy Efficient A-Rated

A-rated energy performanceLow-E coated glass

A-rated sealed units can cut window heat loss by up to 80% compared to old single glazing — making a real difference to your heating bills and comfort. All our energy efficient units carry verified Window Energy Ratings and meet current Building Regulations.

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Double Glazed Unit – 1000 × 800 mm
Double Glazed Unit – 1000 × 800 mm
From £200.00
4wk 0
Single Cut Shape | Lead Time 4 weeks

About Energy Efficient A-Rated Glass

Energy efficient A-rated glass units represent the gold standard in thermal performance glazing. These sealed units typically feature double glazing configurations of 4-20-4mm or 6-16-4mm with advanced Low-E coatings and argon gas fills, delivering exceptional insulation properties for modern homes and commercial buildings.

Each unit achieves U-values between 1.2-1.4 W/m²K, significantly exceeding Building Regulations requirements. Manufactured to BS EN 1279 standards, our A-rated glass incorporates warm edge spacer technology to eliminate thermal bridging whilst argon gas filling enhances thermal performance by up to 10% compared to air-filled alternatives.

Pane Relief manufactures every energy efficient sealed unit made to measure, ensuring perfect fit for your existing frames. All units come with comprehensive guarantees and next-day UK delivery available for urgent replacements.

Frequently Asked Questions

  • What U-value do A-rated glass units achieve?
    Our A-rated energy efficient glass achieves U-values between 1.2-1.4 W/m²K, with A+ units reaching as low as 1.0 W/m²K depending on configuration and gas fills used.
  • How much can A-rated glass reduce heating bills?
    A-rated glazing can reduce heat loss through windows by up to 30% compared to standard double glazing, typically saving £100-200 annually on heating costs for average homes.
  • What's the difference between A-rated and standard double glazing?
    A-rated units feature Low-E coatings, argon gas fills, and warm edge spacers, achieving U-values of 1.4 W/m²K or better versus 2.8 W/m²K for basic double glazing.
  • Can you manufacture A-rated units to any size?
    Yes, we manufacture all A-rated sealed units made to measure within standard size limits of 150mm minimum to 2000mm maximum dimensions for most configurations.

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