New double glazing - but fuel savings?

robinwales

Just had new double glazing installed to replace the old DG units that were 20 years old. I don't have any documentation for the old units but I have been told they were probably energy rating 'C' which was/is the building regulation standard minimum.

The new units are rated 'A' as they have the following features over the old units.

1. Argon gas filled air gap.
2. 20mm air gap (old ones were 12mm). Glass is 4mm thick.
3. 'Soft' spacers (the strip between the panes) which is supposed to be more heat efficient.
4. Heat reflective glass that helps take in radiant heat from sun during the day and helps bounce back heat into the room from within.

I'm having trouble finding info on likely savings of A rated over C. Anyone know?

I am on a new oil burning condensing boiler. Also have a magnetic filtration system fitted near the boiler - one of these http://www.screwfix.com/c/heating-plumbing/filters/cat2840004

System

Click down to how much could I save:

http://www.energysavingtrust.org.uk/home-energy-efficiency/energy-efficient-windows

I assume that you just deduct the 'C" savings from the 'A'.

robinwales

Hengus wrote: »

Click down to how much could I save:

http://www.energysavingtrust.org.uk/home-energy-efficiency/energy-efficient-windows

I assume that you just deduct the 'C" savings from the 'A'.

Thanks. Those figures are a bit weird as there is very little difference between A and C for a detached house. That wan't the main reason I changed windows, but I thought the difference might have been more.

Cardew

Despite the silver tongued salesmen's patter, double glazing is one of the least cost effective measures to save energy.

The Energy Saving Trust gives estimates of annual savings over single pane glass in typical properties http://www.energysavingtrust.org.uk/home-energy-efficiency/energy-efficient-windows