I don't think you want the pressure of the water to be 2 bar, that is a lot, the 450 litre pump has a 1m head, this means that the pump can pump water up 1m, this is equivalent to 0.1bar. If you want to generate 2bar pressure you are looking at something considerably larger than a pond pump, you need something capable of pushing water 20m up a vertical pipe, bearing in mind of course that there will be no flow at 20m up, the pump impellor will literally be spinning in the pump pushing water out as fast as gravity is trying to pull it back down.
If the water feature is an open pipe then there is no pressure to speak of, you only generate pressure when you restrict flow. You need pressure to overcome gravity, to lift the water the height that you need and have sufficient energy left to give you flow.
With the chart linked above, if you lift the outlet of the hose 1m above the pump then there is no flow on the 450 pump. If you mounted this pump level with a gallon bucket then it would take just under 1 minute to fill, the minute you lift the bucket it takes longer.
Think more about what you want the feature to look like and then work from there.