  Environments in quantum thermodynamics usually take the role of heat baths.
These baths are Markovian, weakly coupled to the system, and initialized in a
thermal state. Whenever one of these properties is missing, standard quantum
thermodynamics is no longer suitable to treat the thermodynamic properties of
the system that result from the interaction with the environment. Using a
recently proposed framework for open system quantum thermodynamics which is
valid for arbitrary couplings and non-Markovian effects, we show that within
the very same model, described by a Fano-Anderson Hamiltonian, the environment
can take three different thermodynamic roles: a standard heat bath, exchanging
only heat with the system, a work reservoir, exchanging only work, and a hybrid
environment, providing both types of energy exchange. The exact role of the
environment is determined by the strength and structure of the coupling, and by
its initial state. The latter also dictates the long time behaviour of the open
system, leading to thermal equilibrium for an initial thermal state and to a
nonequilibrium steady state when there are displaced environmental modes.
