I ordered Northern Brewer’s “Firm Wrap” for my refridgerator. The weather here in the PNW turned unseasonably cool last week. The shipment is due here by next Friday. I had to improvise for my 10 gal. batch of Ranger Clone IPA.
Necessity being the mother of invention, I grabbed my Hoffbrau Haus Growler, filled it with water, and plunged an aquarium heater into it. First setting of 78 deg. F. got the fridge box up to 60-61F. I need 65F so I unplugged it, waited a half hour, and then pulled it out of the growler, and ratcheted up the temp. to the low 80’s F. I think I can keep the Fridge box on the mark with this satellite lash up. There is no direct contact with my wort, but the growler’s walls are warm to the touch. And there’s no light to interfere with the wort.
There was no way I was going to order any pads to go underneath this old 13 gal. carboy. With about twelve gallons inside, its much too heavy to just lift it off the plywood platform I built in my 15 C.F. Fridge, and set down a heating pad. The Firm Wrap isn’t on the online catalog, but they still stock it. It doesn’t have any timer, but I can wire it to my Digital External Johnson Controller that I bought to run the Fridge, itself.
When I get the Firm Wrap taped to the carboy, and wired into the controller, I’ll pass off the 50 Watt aquarium heater to my daughter, for her aquarium. Its not in any wort or chem solution. The growler is just filled with tap water. Fortunately, there’s a pet supply store next door to our Radio Shack, here. Radio Shack didn’t have anything, but sent me next door to buy some kind of pet warming device. I had the brown glass growler, and the 50 Watt submersible heater was $20 plus some tax. This model has a rubber guard on the bottom, so I just slipped it down into the water filled brown glass jug.
I think that this temporary solution of using two disconnected water vessels to maintain a constant temperature in my Fridge box, as the wort ferments in the larger one, is unique, to my knowledge. These little submersible heaters have very precise thermometer controllers. For a two liter Hoffbrau Haus style growler, a 50 Watt number was recommended by the Pet Store clerk.