what size heater for a 16 foot pool?

[LT123]

So if I change from a 15ft ( 36 deep i think) pool to a 16 foot (48 deep) above ground metal frame pool, do I need a higher power heater? have a 3kw at the mo.. can I use this on the new pool, and would it be less effective, or is there a reason I cannot /should not use it? Thank you