A closed vessel is initially filled with liquid water at saturation conditions. Three nucleation sites are located at bottom. Constant heat flux enters through the bottom wall and induces bubble growth. Bubbles move up due to buoyancy effects and detach from the wall. New bubbles appear and move to the surface where large distortions appear. The same flow model is solved with a unique algorithm (implicit preconditionned, Le Martelot et al., 2013, 2014).