Energy rating

[shahs2]

Hello - can anyone tell me whether is worthwhile to install an Energy rated B window compared to C rated.  This is for a buy to let 3 bed house.

I don't know what this really means in fuel bills.

Also the quotes I have vary widely from £9600 to £7800 to £6150 for

Porch
back slding door
2 bay window
5 window

Do they all provide window sill as standard now?

Appreciate any helpful lesson learnt or tips

Thanks

[sigurd]

I know that it is too late for your purchases, but I post this for reference. I am getting quote for windows as well, so I am researching on this topic.

This is what I found from Pilkington website (http://www.pilkington.com/europe/uk+and+ireland/english/energikaretrade/faqs/market.htm#5)

"C8. What is the average saving to householder between A, B & C rated windows in terms of energy and cost savings?

A, B and C rated windows are all much more energy efficient than standard windows. That said, there are differences in performance of energy efficient windows with A B and C ratings;

    * Changing existing single-glazed, timber windows to Band C windows in a semi detached, gas fuelled house would be expected to save £4350 in heating costs and 11 tonnes CO2 over the life of the windows.
    * If the new windows are instead B-rated then the savings increase to £4650 and 11.5 tonnes CO2 .
    * And, if the new windows are instead A-rated then the savings increase to nearly £5000 and over 12 tonnes CO2 .

The above shows that achievement of the level C displays significant savings over existing windows with higher ratings of B and A delivering further smaller incremental savings above C."

And Pilkington suggested no more than 10% mark up on the better rating.

[petejypvow]

Hi

I have read reports in the UK of savings in the region of £350 per year for a typical house if all windows are upgraded from C rated to A rated.  I would therefore expect that you will see a saving of this order for your project.  This saving is of course all energy as windows are the biggest source of heat loss in most homes.

All the windows will come with external but not internal sills usually.