I've just been in the loft to move stuff back to where it was and I noticed that he's altered both the hot water and central heating controls on the boiler. The guy who installed it five years ago set both controls to No.7 (they go from 1 to 9) and they've never been altered since, neither by me or by any engineer who's serviced the boiler, but today's engineer has moved both controls to No.9
Now, I freely admit that I'm no heating engineer but for most things in life, if you turn something up to maximum, then you use more of something. Given gas prices and especially the latest round of ripping off, sorry, price increases, I don't want to be using more gas than I have to. Our heating and hot water have always been hot enough for us with the controls set at No.7, so can I turn them back down, or is there some engineering reason (to do with the emissions and tweaking he had to do) to leave them at max?