"Hi Carl.
Good control over your heat input is a real game changer. Weather you are using propane or electric.
I have read that some folks prefer to heat their mashes up slow for flavor,,,,,,but ya mostly gotta be mindful of scortching...specially if you are stilling on the grain.......But you are running a reflux rig,, and likely just a sugar wash,,,,, so most just heat as quick as they can then turn down the heat for the body of the run. Only so much time in the day before the kiddiewinkles demand attention
.
Insulating your rig can increase efficiency too. You will have to find your own comfort zone for how much fuel/input you are willing to expell for your runs...
With a packed column ya can't run with too little heat as ya need to produce reflux....More reflux=higher abv.... If yer column is packed properly then you'll get a good wetted surface on yer packing and get a nice pure product....But be mindful that ya don't go willy nilly on the reflux and flood yer column.
I would recommend a goodly 100% reflux period for you coulmn so that your fractions can stack nice and orderly like good little soldiers.Then draw your heads off kinds slowly....Then 100% reflux for 10 or 15 more minutes. Then start collecting product. Head temp should stay nice and stable. Adjust you power and cooling accordingly.
I'm a pot stiller at heart. Others can explain column operation better than me."