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The control of electric currents with diodes and transistors [1] is undoubtedly the main corner stone of modern information technologies.Such devices allow rectifying,switching,modulating and even amplifying the electric current.Astonishing,similar devices for the control of heat flow is not frequent at all in our daily life.In 2006 Baowen Li et al.[2] have proposed a thermal analog of field effect transistor to manipulate the heat flows using acoustic phonons,paving so the way to a new route for controlling heat fluxes in a similar way as electric currents.In this presentation I will introduce buiding blocks to make similar manipulations using thermal photons exchanged between contactless systems [3-4] out of thermal equilibrium.Some basic physical mechanisms such as the radiative thermal rectification [5],the photon tunneling amplification mediated by many-body interactions [6],a transistor effect [7] and bistable thermal behaviors [8] will be discussed.