cut so there is 2-4 nodes. reduce the leaf area.
It would be better to apply 0.1% IBA & stick cuttings in well drained soil & mist 3-4 times a day

My question concerning rooting them in water was because I have had much success with rooting my Philo scanden (heart-leafed philo) in water.

What is 0.1% IBA & stick?

0.1% IBA means 0.1% Indolbuteric Acid a common rooting hormone that promotes root growth
stick means insert or place
Please excuse my poor english