  The design of a mesoscopic self-oscillating heat engine that works thanks to
purely quantum effects is presented. The proposed scheme is amenable to
experimental implementation with current state-of-the-art nanotechnology and
materials. One of the main features of the structure is its versatility: The
engine can deliver work to a generic load without galvanic contact. This makes
it a promising building block for low-temperature on-chip energy management
applications. The heat engine consists of a circuit featuring a thermoelectric
element based on a ferromagnetic insulator-superconductor tunnel junction and a
Josephson weak link that realizes a purely quantum DC/AC converter. This
enables contactless transfer of work to the load (a generic RL circuit). The
performance of the heat engine is investigated as a function of the thermal
gradient applied to the thermoelectric junction. Power up to $1$ pW can be
delivered to a load $R_L=10\ \Omega$.
