The 6 types of steam generators on the market
This will break down the 6 different types of steam generator technologies used by the differnet brands out there. I have reviewed Mr. Steam, Thermasol, Steamist, Elite Steam, Steamcore, Kohler, Steamspa and many brands that have came and gone out of business over the years.
I will rank them from the wettest steam with the highest condensate to the driest steam (highest dryness fraction with the lowest condensate).
Type 1:
Low PSI pressure cooker (lowest priced, usually a Chinese import, low quality components)
Type 2
High PSI pressure cooker (mid range price, higher quality components, usually fancy bells and whistles to distract people from what to expect (long duty cycles, wet steam but not as wet at type 1)
Type 3
Low PSI dual tank pressure cooker (These are the knock offs of the Thermasol). They look almost identical to the person who doesn't know how to research the component quality of the generator and just buy based on specs. These low psi, Chinese import Thermasol knock offs give a wet and drippy steam and leak water for the first 5 or 10 seconds at the beginning of each duty cycle when the steam comes back on. These produce just slightly better quality steam than a single tank low PSI steam generator (type 1)
Type 4
These are the High PSI dual tank steam generators. These have the least amount of condensate of all the pressure cookers and are in my Tier 1a which is the highest quality steam generator for pressurized generators out right now. Do not get confused as knock offs have the same specs on paper but when you go in a low psi and a high psi model you will notice the dryness fraction is not even in the same ball park as the type 3 generator.
Type 5
These are the non-pressure cooker steam generators. They have dual tanks (boiling tank and inlet tank). Since they are not pressurized it takes a few extra minutes to start steaming but once it starts it is continuous no more than 6 degrees from what you set it at. These have the driest steam fraction due to the inlet system dripping water just enough to limit condensate (moisture in steam).
Notice: for those that get a type 1 or type 3 low psi generator, I urge people to get a closed loop circulator or a ventilator to get rid of the condensate that can start sticking to the ceiling. A closed loop will bring that condensate down to the floor and it will keep your feet and legs warm and it is too heavy at this point to rise to the ceiling again.
Note: There is a type 6 (L series) that is ultra high end, super high psi dry steam for pressurized steam but it is too expensive for most people and Mr. Steam is more affordable and most people want continuous dry over duty cycle dry. The steam that comes out of the L series only starts at 9KW also. Because it is such a high quality steam and most household water is not right for it, most people will find cleaning the limescale off all the time too much maintenance unless
The 9KW model is rated for a 360 cubic feet (very similar to the non pressurized model that works up to 375 feet). Both have very little condensate compared to the lower end pressure cooker type (low psi). Thermasol Model PRO-240 (10kw model) works up to 240 cubic feet). My first priority when choosing a generator is first making sure which steam quality is best for the type of steam room. If the room has ceramic tile and a glass door and over 7 foot tall, those are 3 things not in favor of working with high condensate. Once the steam hits the walls, wetter steam is most likely going to stick more than dry steam.
The only time I really don't have problem with wet steam is when I don't have to upsize 30% for the til and 10% more for a glass door. I am not against wet steam depending on the application.