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→Tips on Maintaining Heat for Homebrewers
* Use a Kenley Fermentation Carboy Heater which comes with a thermostat (also marketed as a "Kombucha Heating kit") <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2878858452142350/?comment_id=2878872112140984&comment_tracking=%7B%22tn%22%3A%22R%22%7D Chris Hunter. Milk The Funk Facebook group post on heating kettles for wort souring and kveik. 08/29/2019.]</ref>.
* Use an aquarium heater (Enheim brand recommended), fill a large plastic cooler with water and keep the water warm with the aquarium heater. Set the souring vessel in the cooler. See [https://www.homebrewersassociation.org/how-to-brew/homebrew-hacks-aquarium-heater-fermentation-controller/ this AHA article].
* Use an electric kettle with a temperature controller, such as a Grainfather, Braumeister, Brewer's Edge Mash & Boil, or a home build electric kettle.
* Use a "Seedling Heat Mat" that is used to keep plants warm.
* Use an [http://anovaculinary.com/ Anova sous vide device] - place the vessel in a larger vessel with water, and keep the heat applied to the outside water with the Anova. Works well for maintaining heat for starters too. See this [https://www.facebook.com/groups/MilkTheFunk/permalink/2373341069360760/ MTF thread] for a Q&A on how to use an Anova for various brewing related methods.