I don't think that you can necessarily attribute most or all of the savings to these panels.
Did calculations today, got them installed in end of May 08 - bought 1363 Litres of Kerosene since then. For same time previous year (07) up to December 07, we purchased 1935 Litres of Oil which if my calculations are right is a saving of aprox 40%.
Jan to Dec 2007 bought 3287 Litres of Oil
Jan to Dec 2008 bought 3095 Litres of Oil
our house is 3950 mtr sq, it is a dormer bungalow.
I am sure it works though and will certainly try it myself, just my 2 pence worth. (how much would you pay to have some one place tin foil under the grill tray , it throws heat back up to the delicious harty morning fry and also acts as a deterant to corrosion of grill tray!)
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