Installed this on my Vegas.. took 5 minutes to install.. Follow instructions
The thermostat setting on my Vegas was for both LP and Elect.
I do agree with SuperD as i realized the cold water adds to the pressure and makes the hot water last a bit longer.
In the long run I have the heater set at the "D" setting -halfway and its 120*
this has proved to be my comfort zone.
Let me know if you have any questions.
Will try and take a pic later tonight.