Hello All, I'm working on a project and one of the main parts is this pressure vessel that is sealed air tight that has 2 tubes coming out. One is straight and the other is a U tube. I have a 2.5 KW heater coil in the water to boil the water in order to create steam to raise pressure and move the water through the tubes into a holding/cooling tank (open to atmospheric pressure). What my common sense and calculations should me was that the water level of should be the same throughout the compression of the water through the tubes. But- as seen in the video the water through the U tube flows quicker and makes a "tunnel" of steam allowing the pressure to drop causing an instant boil... Note that the tubes are connected on top before they enter the second tank. (-same pressure and water head). http://www.youtube.com/watch?v=U79b0hjywn0&context=C279bbADOEgsToPDskLiK7yY_ee_4iOSEz4nqi6t Pic of system (before i got the heater): **The brass parts are one way valves. The left is directed for upwards flow and the one on the right is directing from the clear hose back to the bottom tank. The question: Why isn't the water level descending equally through out both the tubes?