  We will study a class of system composed of interacting unicyclic machines
placed in contact with a hot and cold thermal baths subjected to a
non-conservative driving worksource. Despite their simplicity, these models
showcase an intricate array of phenomena, including pump and heat engine
regimes as well as a discontinuous phase transition. We will look at three
distinctive topologies: a minimal and beyond minimal (homogeneous and
heterogeneous interaction structures). The former case is represented by stark
different networks ("all-to-all" interactions and only a central interacting to
its neighbors) and present exact solutions, whereas homogeneous and
heterogeneous structures have been analyzed by numerical simulations. We find
that the topology plays a major role on the thermodynamic performance for
smaller values of individual energies, in part due to the presence of
first-order phase-transitions.Contrariwise, the topology becomes less important
as individual energies increases and results are well-described by a system
with all-to-all interactions.
