Head space in a keg

[jon1163]

As some of you know I run a 15 and a half gallon keg boiler on a pot still. My heating elements are covered when I have about four gallons of liquid in the boiler. I generally run about 10 to 12 gallons of wash but I'm looking to do several smaller batches. As long as my element stay covered is there any detriment, taste or otherwise, to running smaller batches and having the extra headspace?