  We consider the problem of boiling of the direct contact of two immiscible
liquids. An intense vapour formation at such a direct contact is possible below
the bulk boiling points of both components, meaning an effective decrease of
the boiling temperature of the system. Although the phenomenon is known in
science and widely employed in technology, the direct contact boiling process
was thoroughly studied (both experimentally and theoretically) only for the
case where one of liquids is becoming heated above its bulk boiling point. On
the contrary, we address the case where both liquids remain below their bulk
boiling points. In this paper we construct the theoretical description of the
boiling process and discuss the actualisation of the case we consider for real
systems.
