If you purchase a standard Brew Bucket it does not have provision for a thermowell. But you can just buy a cheap stick-on thermo strip and they work GREAT on stainless because stainless is a way better conductor of temps than the plastic buckets that these historically have been stuck on the most in entry level HB kits.
If you want to upgrade a bit and have a Bucket with a thermowell, we sell those to under the model name "Brewmaster Bucket" CLICK HERE to check it out. This includes a thermowell and a very nice LCD temperature gauge in the box standard. Super elegant solution for not that much more $$ on the upgrade! Check it out!