Having your water boiling at the right intensity is important for efficient and safe processing in the Mehu-Liisa steam juicer. Here are a couple of videos to illustrate the point:
This first video shows a furious boil: the heat is too high here and you will run the risk of boiling your pan dry and damaging your juicer and your stove.
This second video shows the appropriate steady boil which generates plenty of steam and removes the risk of a burnt water pan.
Use a timer when you process. Set it to 30 minutes as soon as you assemble the juicer after the water comes to a boil. After 30 minutes, check the water level, add additional water if necessary, and set the timer a second time for up to 30 minutes (60 minutes total processing).
Following these steps will assure your juicer will serve you for decades and that you will be working in a safe environment.