It keeps the temperature stable, but it doesn't take into account how much air is passing the heating element. based on why it was made, i kind of understand why they didn't do that. It was designed to be able to keep a stable temp, regardless of your inhale. That's a good, and a bad thing. Its good because you have a good idea what temperature the heater is at, and the air. The bad is you won't see the same results, technically, because your inhales may be different from one session to the next. The aromed is 3 liters for every 15 seconds(if i remember correctly), the volcano doesn't, I was wrong about that one. The crafty, and the mighty are 10l/min. The plenty is 30 l/min. Looking at how much air the plenty can heat up, it makes sense why it was the highest in thc/cbd extraction for desktops. It's design is perfect fore a large extraction, quickly. The hose, being narrow, helps lower the atmospheric pressure, along with your inhale, and that helps with extracting quickly, and at a lower temperature then a loose bowl will. Plus, the bowl itself also helps with lowering the atmospheric pressure because when you have a tight bowl, and you are inhaling strongly, more actives can be extracted, as long as the heat stays consistent, and a lot of air can pass through the tight space. Allegedly!