Christian McArdle wrote:
So is it feasible to put a pump in a rain water butt to feed water to the
power washer?

Mine worked just fine from a bucket. Used water surprisingly slowly, too.
Make sure the water is filtered, though. You don't want bits of leaves and
twig in the washer.

I was watching that "green" programme last night about that bloke who
can't afford a pair of scissors setting up a turbine to pump well water
to his roof from an open well.

It struck me as odd they never built up the adit to keep out surface
water and didn't seem to have a cover to stop windblown litter dropping
in.

No mention of a filter either. The occasional blip that might put a
little grit in the works is capable of playing havoc in the plumbing.
They'd onlly need a felt pad or somesuch in a collander.