A jacket is basically an extra layer around the vessel, in between which liquid can be pumped to better control the temperature of the fermentation process.  Maintaining a precise and even temperature is really crucial in the fermentation process for ensuring high quality product, and this temperature controls becomes very difficult in larger commercial-sized vessels without the use of a jacket.

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Absolutely necessary to have your tanks jacketed.  The only case you wouldn't have it is if you had the tanks in a walk-in cooler.  You ideally want all your fermentors to be jacketed and insulated.  The insulation saves you a lot of energy as it traps all the coldness inside and keeps your energy cost down. 

Matt 

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