got few question re this..mine is apartment unit.

1) 2 bathroom (90% time only 1 bathroom in use) - which size i shud go for? say 15L model, is it enough for one time bath? normally how many liter water a person used during a say, 15-20mins shower?

2) my ceiling height (from plaster ceiling to top of slab) is approx 18-19inch...is the height sufficient to fit in the tank?

thanks!