Controller to adjust hot water system - Bosch 26E?

Hi, I am installing a instantaneous hot water system at home. Looking at the Bosch 26E. Is it worth getting a controller installed for the unit? The plumber says that the water temperature can be preset at 50 degrees C. and therefore the controller is just rubbish. He says its like driving an automatic car manually... show more Hi, I am installing a instantaneous hot water system at home. Looking at the Bosch 26E. Is it worth getting a controller installed for the unit? The plumber says that the water temperature can be preset at 50 degrees C. and therefore the controller is just rubbish. He says its like driving an automatic car manually since the water temperature will be preset, so why use a controller over it! What are your thoughts? Thanks.
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