This is the one I bought in the end.
Fronius water cooler. The circuit board supply went bang. The pump is 24v 4 amps dc. I tried a 19v 5 amp lap top supply then a 24v 6 amp Chinese step down supply and neither would even get it to start. So I put some money into a posh 24v 10amp European supply which should of been over £100. Straight away it sprung into life.
Very nice bit of kit made to fit perfectly