I seem to be using 20 litres per 3 bed semi-detached - but I'm sure I could get away with using less. I just don't want to risk getting any complaints/losing any customers.Mike
I know it's madness - but I can't stop myself!
I used 400 ltrs today on 16 detached houses, 5 with conservatory and 3 were 3 storey.Took me 8 hours non stop.
125 - 150 L a daynow using it on more than half downstairs aswell