It does not sound like you know what you are talking about.

Looks like you are thinking about sauna warm-up time where I talk about heaters warm-up time. They are completely different things. Let me recite the part of the post above (important points are made bold):

Heater warm-up time should not be confused with sauna warm-up time. Sauna warm-up time depends heavily on the overall power of heaters installed, on the volume of the sauna and on speed of air circulation. Slow warm-up and cool-down can be a plus in sauna models which use turning heaters on and off to maintain constant temperature in a sauna. In such models, slow warm-up and slow cool-down lead to more gradual change in intensity of heat when heaters turn on and off.

I think that carbon heaters, because they are thin and thus have little volume, will reach their working temperature (which is lower than for other heater types) relatively fast. It doesn’t mean that a sauna will reach preset temperature quickly.

Also I don’t agree that a sauna with carbon heaters takes a lot longer to get warm. Can you give the reasons why a sauna of certain wattage, size and construction with carbon heaters will take longer to warm-up than exactly the same sauna, installed in a same room, but with ceramic or any other type of heaters? Doesn’t amount of heat emitted from heater depend on its power, not from material of which the heater is made of?

I do not advocate any specific heater type, I just want to disprove the statement I believe is wrong. Please provide your arguments; don’t say that I don’t know what I’m talking about; show that you know what you’re talking about.