Right now we do not offer just the jacket/coil/controller/etc on its own from our web store. These are packaged at our shipping warehouse ready to go in pre-kitted packages. These are only available through the appropriate sized FTSs Kits (and in reality, the warranty on something like the FTSs is nearly ZERO, so we don't even have to worry much about stocking bunches of backup kits or parts).
What we are NOT inclined to do however is support 3rd party/competitor product with our gear. This just gets to be far too much work, not to mention we didn't invest all of our time and resources to develop a cool system only to have it leveraged on competitor hardware. We have been asked by some to do custom lids for Blichmann fermenters for example. Or would we sell them neoprene jackets for use with some Kickstarter temp control device they bought, etc.
The bottom line for us is that anytime we have to deal with small and relatively low dollar spares and accessories - it becomes a real drain on our time and resources. We ship and stock these as KITS prepackaged from our manufacturing facility. So anytime we give you a single part of something from the FTSs, it is breaking a kit and we are left with a bunch of parts.
If you are an Ss Brewtech customer, and you are facing an issue with your FTSs system - we'll try to get you back up and running or work with you if you have damaged gear. Please reach out to our Ssupport team.