Central heating / power usage (3 replies)

Looking for a bit of advice here ,

we had a conventional central heating system about 15 years old ( hot water tank upstairs ) which we replaced with a combi boiler in march of this year .

fortunately for us we were on a fixed rate energy deal that runs out in October so i finally got around to looking at our usage/cost

Now looking at the history of our power use it appears that since the new boiler was fitted we seem to be using about 35% less gas and 25% less electricity (year on year ) .

The only reason we changed the system was because the old system had started to get unreliable and the boiler insurance people wanted to up our premium to 60 quid a month , we happened to have enough spare money to be able to pay for the new boiler outright so i thought why not .

I'm kind of gob smacked that a new boiler can cut usage by as much as it appears to have done , have i missed something or are the new boilers really that much more efficient ?