Yes. The saunas use the electric heaters that have the rocks where you can pour a bit of water on them to create steam that fills the sauna cabin and increases the sauna bath temperature.
There are recommended electric sauna heaters for the saunas, so that when you order the sauna the heater will be shipped with it. If you order a heater that is not provided by Dundalk Saunas, it will arrive separately from the Dundalk Sauna shipment.