Both Ceramic heaters and Carbon heaters have there pros and cons. Ceramic cost less, can be used for spot treatment because the heat is concentrated close to heaters, and the ceramic heats up quickly with the most intense heat closer to the heaters.
Carbon heaters evenly distribute heat throughout the HeatWave sauna, carbon heaters have very large surface area that helps with evenly distribute the heat, carbon is less fragile than ceramic heaters, and are the most efficient which means a lower cost to operate.