The Siemens RWD44 is obsolete
RDW Series programmable temperature controllers for heat pump air conditioning applications.
A possible solution:
RDY2000
This is a thermostat and is designed to be installed in the controlled space as opposed to a cabinet or enclosure (see documents attached).
There is an option to add a remote sensor, ALTHOUGH you would need to change it for the QAA2230.EWSN as the QAA24 that was usually connected to the RWD44 is not compatible with the RDY2000.
