  In the present paper we report comprehensive analysis of the thermodynamic
properties of novel hydrogen dominant potassium hydride superconductor
(KH$_{6}$). Our computations are conducted within the Eliashberg theory which
yields quantitative estimations of the most important thermodynamic properties
of superconducting phase. In particular, we observe, that together with the
increasing pressure all the thermodynamic properties decrease, e.g. $T_{C} \in
\left< 72.91 , 55.50 \right>$ K for $p \in \left< 166 , 300 \right>$ GPa. It is
predicted that such decreasing behavior corresponds to the decreasing hydrogen
lattice molecularization with increasing pressure value. Futhermore, by
calculating the dimensionless thermodynamic ratios, familiar in the
Bardeen-Cooper-Schrieffer theory (BCS), it is proved that KH$_{6}$ material is
a strong-coupling superconductor and cannot be quantitatively described within
the BCS theory.
