14.8 is on the high side, but not worryingly so IMHO. Does the voltage rise higher after the engine has been running for a while and the battery is fully charged? Might be worth checking it after a journey, before stopping the engine. Also, load up the electrical system with heated window & seats, headlights, blower on full and so on, and see how the voltage holds up then. If the alternator is faulty, I'd be surprised if it doesn't drop once a full load is presented to it
Whilst it's possible that something is causing an abnormal load, there isn't much that will do so yet not also flatten the battery in short order when the engine is stopped, IMHO.
The most likely scenario for an alternator that's getting excessively hot yet, from the outside, appears to be working perfectly would probably be a shorted turn or two in the stator windings or perhaps a diode in the rectifier pack that has failed short circuit.