There is hairdryer in the room, but not in the bathroom.
I believe so. There was in our room and in the rooms of our group. In most hotels we stayed in Ireland, the dryers are in a drawer in the bedroom section and at times difficult to use due to location and height issues.
Hairdryers in Hotels in Ireland are not in the bathroom because of the danger of mixing electricity and water. The outlets in the bathrooms do not accept hair dryer plugs. You will find the hairdryer somewhere else in your room. This may be a European Union safety requirement.
There was one in the bedroom but not in the bathroom. It had a short lead so I would recommend that you bring a short extension lead with you.
Get an answer from Killarney Towers Hotel & Leisure Centre staff and past guests.