The stability of stationary flat phase surface at presence of heat fluxes going from a metal surface heated up to high temperatures trough a thin vapor film to a liquid is investigating. Boundary conditions for perturbations on the phase interface that are taken into account dependence of the saturation pressure on temperature and slow changing of the stationary vapor film thickness are generalized well-known boundary conditions on a free isothermal surface of a liquid. Linear and non-linear solutions of the stability problem demonstrate new effects on the phase surface: Thermal processes on phase border lead to generation slowly attenuated small amplitude waves which speed can much more exceed speed of gravitational waves; Fluctuations of the heat flux through a phase surface generate periodic waves of small lengths (ripples) which are not capillary waves; Periodic waves and solitons on a phase surface can arise even in absence of a gravity; Thermal processes on phase surface can support existence of the stable vapor layer under a layer of a heavy liquid in a gravity field; If thickness of a stationary vapor film is slowly changing the explosive instability can be generate. At the nonlinear stage of the explosive instability development, the amplitude of the originally small surface wave grows indefinitely for final time.
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