This information is part of the Modelica Standard Library maintained by the Modelica Association.

The heating rectifier shows a heat flow always if the electrical capacitor is loaded.

Simulate until T=5 s.Plot in separate windows:
SineVoltage1.v and Capacitor1.p.v
HeatCapacitor1.port.T and HeatingDiode1.heatPort.T
HeatingDiode1.heatPort.Q_flow