Constant Steam VS Cycled Steam
The question I always is do I want my steam always or steam that goes on and off.
The steam generators that cycle on and off heat up the room slower and there are times when there is a lag in steam. The higher end steam generators have less of this lag time. The continuous models (Thermasol) heat up the room much quicker and stays more constant. If you set the room to 105, then at 104 degrees on the constant steam generators it kicks back on.
Note: the highest temperature steam generators go to is 120 degrees. Beware of getting too high of a power of steam if using residentially as too much can burn your feet or wherever the steam hits.
Also, with the constant steam, it puts out less gallons per minute. In a 20 minute session a 1 gallon output feels way different than 2 gallons. Many people prefer a lighter steam and some like the heavy steam. A continuous steam generator will always heat my core much quicker than pulsed steam. Some people like to keep it hot the whole time while others don't mind the cold spots as they want to cool down without getting out of the steam room to cool off.
Continous vs pulsed steam: how it feels different
The best way to show what it looks like is the continuous type have a constant fluffy cloud of steam. The on and off type has a really big cloud, much more rich but the vapor is heavier and the cloud stay less long. If using essential oils, the continuous type holds the oils in the air much longer. It can get expensive if using oils in a steam room where it gets cold and hot too many times as the oil will drop down to the floor and go down the drain.
Note: I never use a generator that is rated for over 2kw over the recommended size for the cubic feet of the steam room. Even though the temperature is the same, the amount of steam if too much comes out at once can heath the body too quickly. When my heartbeat starts beating too fast I want to get out sooner. I like to heat my core slower so I can stay in longer and reach the point till I want to get out much longer.
Also, the cycled type steam genitors tend to be more drippy. It depends on how long it stays on. When the steam is off the ceiling can cool down quicker and start dripping steam. With continuous steam, it stays hot longer on the ceiling of the steam room and doesn't condense as quick and less drippy. If not using a steam room with a slant this can make a big difference in drippiness.