  We considered the structure of steady-state radiative shock waves propagating
in the partially ionized hydrogen gas with density rho1 = 1e-10 gm/cm^3 and
temperature 3000K <= T1 <= 8000K. The radiative shock wave models with electron
thermal conduction in the vicinity of the viscous jump are compared with pure
radiative models. The threshold shock wave velocity above of which effects of
electron thermal conduction become perceptible is of U1=70 km/s and corresponds
to the upstream Mach numbers from M1= 6 at T1=8000K to M1=11 at T1=3000K. In
shocks with efficient electron heat conduction more than a half of hydrogen
atoms are ionized in the radiative precursor, whereas behind the viscous jump
the hydrogen gas undergoes the full ionization. The existence of the electron
conductive precursor leads to the enhancement of the Lyman continuum flux
trapped in the surroundings of the discontinuous jump. For upstream velocities
ranged within 70 km/s <= U1 <= 85 km/s the partially ionized hydrogen gas of
the radiative precursor undergoes the additional ionization (<= 5%), whereas
the total radiave flux emerging from the shock wave increases by 10% <=
delta(FRad) <= 25% .
