  We report on an experimental and theoretical study of nonlocal transport in
superconductor hybrid structures, where two normal-metal leads are attached to
a central superconducting wire. As a function of voltage bias applied to both
normal-metal electrodes, we find surprisingly large nonlocal conductance
signals, almost of the same magnitude as the local conductance. We demonstrate
that these signals are the result of strong heating of the superconducting
wire, and that under symmetric bias conditions, heating mimics the effect of
Cooper pair splitting.
