I emailed SS BrewTech support and the response is that only the sleeve is jacketed.
Swing and a miss!
Completely agree that even if only the sleeve is jacketed, it is FAR better than a cooling coil. If I was starting from scratch I wouldn't hesitate. Right now I have a Spike 7 gal, 14 gal and half BBL and one SS BrewTech half BBL -- all with cooling coils. I could replace every one of them with a 17 gal and a 1BBL and be able to do batches large and small if I could control cone temps too. Even better would be if the cone jacket was in a separate zone than the sleeve jacket. For large batches, I would put a jumper hose between zones. For small batches, I'd only send glycol to the cone. In the case of heating, personally I find the electric blanket heater thingies rather problematic with too much lead time and overshoot etc. I actually don't heat often, but when I do I just send warm water through the cooling coil. One day I'll pursue an automated solenoid valve that switches between cool glycol and warm water. In my extra spare time and all that.
I've boiled my thoughts down to: when only the sleeve is jacketed, we always have to brew batches large enough to make enough cooling contact to be effectively temp controlled. There is also the inherent circulatory effect of cooled beer falling and cone-warmed beer rising -- which is great during fermentation, but becomes problematic when cold crashing and trying to clarify the beer all the way down to the yeast cake. Bottom line, I want to chill the cone too.
Having said all that, the new tanks do look awesome! But I'm holding out for more versatility. It continues to be a long wait.
are you listening?
I swapped out equipment to buy your new bottom-drain kettles... how about some 2-zone jacketed fermenters!)