  We study the functioning of a three-level thermal machine when acting on a
many-qubit system, the entire system being placed in an electromagnetic field
in a stationary out-of-thermal-equilibrium configuration. This realistic setup
stands in between the two so-far explored cases of single-qubit and macroscopic
object targets, providing information on the scaling with system size of purely
quantum properties in thermodynamic contexts. We show that, thanks to the
presence of robust correlations among the qubits induced by the field,
thermodynamic tasks can be delivered by the machine both locally to each qubit
and collectively to the many-qubit system: this allows a task to be delivered
also on systems much bigger than the machine size.
