I have the set Thebes 8139503 RAMSES 813 TOP2 HF SET A built in exchange for the Thebes Ramses 797 HF Set 1, since this was no longer available. The scheme works perfectly after installation and the control unit has in comparison with the 797er Set additional control functions. Positive also falls on the optional temperature control via the control knob. Although this means functionally no improvement over a +/- button setting, but has a certain charm mE (call it nostalgia). The delivery on time pleasing and even included the required batteries. Negative falls on, which is included with no wall bracket for the control unit, therefore a point deduction. Who wants to have put the control unit into the bookcase or put in the showcase? Here the hobbyist is required and this is in the overall picture inconsistent.