That's quite a big thumper, what size boiler are you intending running it with?
I run my 50l keg with a thumper that holds just 6lt. I charge the thumper with a 3lt mix of heads and tails from previous runs and, as posted earlier here, the output from this modest setup is very high.
The thumper does extend the time from startup to first product out but, in my case, only by 10-12 minutes - one advantage of the small thumper size.
I believe conventional wisdom says a thumper should be around one quarter the volume of the boiler but the results I get from my one seventh volume thumper are huge.
I suspect that what would actually determine the size of thumper required on any still is the volume of distillate vapour generated by the boiler. In my case I usually run my pot with the 2Kw element so the vapour flow fits my thumper which I can just about hear gently fizzing away during the run. This was more by accident than design but I'll take it anyway.
I'll post a few pics of my thumper setup when I next get to my desktop as I don't keep those pics on my iPad.
AM
