Recently had a Logamatic installed on my Buderus boiler. Service tech needed to come out a week later and make an adjustment to heat curve. I noticed there are a number of presettings and was going to change from the default. Salesman said best to leave alone cuz the computer adjusts itself depending on outside weather.

My question is why the 8 possible setting if one should leave at default? I'm looking to save as much as possible, and seems to me that using a setting that "shuts down" hot water during work weekday, would save on usage.