  Here, we develop a theory of radiative heat transfer based on an equivalent
electrical network representation for the hot material slabs in an arbitrary
multilayered environment with arbitrary distribution of temperatures and
electromagnetic properties among the layers. Our approach is fully equivalent
to the known theories operating with the fluctuating current density, while
being significantly simpler in analysis and applications. A practical example
of the near-infrared heat transfer through the micron gap filled with an
indefinite metamaterial is considered using the suggested method. The giant
enhancement of the transferred heat compared to the case of the empty gap is
shown.
