Found some additional info on another web site, specifically max head pressure for each model:
Model MaxFlow(gph) MaxWattage Maxhead(metres) Price
BlueEco240 4840 240 9 689.95
BlueEco320 4840 320 11 795.00
BlueEco500 7000 500 11 1175.00
BlueEco900 7700 900 13 1395.00
BlueEco1500 9240 1500 16 1495.00
9 meters of max head for the 240 is pretty huge, that's > 30 ft.
Info is a way down on the following web page. Took a while to load, not sure what's up with that.
http://www.koicarp.org.uk/koi_dry_goods_water.htm