  In this paper, steady-state MHD calculations of non-relativistic magnetized
accretion discs driving jets are presented. For the first time, an energy
equation describing the effects of entropy generation along streamlines is
included. Using a simplified approach, we showed that thermal effects have a
tremendous influence on the disc capability to feed jets with mass.
  The disc ejection efficiency is measured by the parameter $\xi= d \ln
\dot{M}_{a}/d \ln{r}$, where $ \dot{M}_{a}(r)$ is the local disc accretion
rate. While previous self-similar solutions were only able to produce jets with
$\xi \sim 0.01$, solutions with a coronal heating display huge efficiencies up
to $\xi \sim 0.5$. Moreover, taking thermal effects into account allows to
obtain both fast and slow magnetic rotators.
  Since most of the jet properties (like asymptotic velocity or degree of
collimation) depend on the mass load, it arises from this study that any
quantitative result requires a detailled analysis of the disc energetics.
