This does look promising. Are there any concerns with the element scorching or other potential safety issues if left holding a temp of say 40 degrees for up to a week of souring?I personally dont think they make great kettles as the opening is a bit on the small side but as a HLT they are great. You can also then double use the HTL as a fermenter once you are done.
Having one of these fitted with a stainless steel stick element makes quite a useful multi purpose vessle for sour beers and innoculation as mentioned in the video.