by bt1 » Tue Nov 13, 2012 6:22 am
Hello bat,
30lt certianly faster to heat, save power/gas.
As to reflux in head space, not sure on physics here but from practical when running a 50lt half / 2/3 full for gin runs it's as slow as, same heating, same still etc.
Oftern tried to think it out..reckon the vapour speed drops for some reason...circulates in open space above wash, rather than straight into lower "pressure" col space.
If it where my choice and was going to stay with 20 - 25lt washes I'd go 30lt.
bt1