Hi,

I have connected some water butts to our drain pipes so we now have
lots of free water. Buckets and watering cans are fine but being lazy,
we would like to use a hose pipe occasionally

So I am looking for some sort of pump to generate a decent flow: what
are my options? I see machine mart sell all sorts of water pumps:

submersible ones:
http://www.machinemart.co.uk/shop/ca...ps-clean-water

I presume you have to remove these in winter to stop them freezing?

and centrifugal ones:
http://www.machinemart.co.uk/shop/ca...trifugal-pumps

Does being centrifugal mean they generate better flow, just like
centrifugal extractor fans do ?

Am I right to think that these pumps are on for as long as they are
powered, so they could be pumping when I don't want them to? Is a
pressure switch like this:

http://www.machinemart.co.uk/shop/pr...trifugal-pumps

the answer? It's a shame it costs as much as the pump.

I have heard that some pressure washers will connect to a water butt
but it seems a bit over the top to water the roses with 120 bars!

I see that water butt pumps are available but these appear to be just
another submersible pump without pressure switch. Is that right?

Any ideas what would work best?

TIA