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We generally recommend fitting fermenters into dedicated refrigeration boxes when you have one or two fermenters running at the same time. If you go up to three or more, you probably want to take a note from the pros and built a distributed cooling system with a coil in each fermenter because it uses less floor space. Everyone wants a nice lineup of stainless conicals but if you're growing into a system and still want to make use of economy fermenters, this is the cheapest cooling coil on the market.
The coil is bent in-house from 3/8" OD 304SS tubing. The long In/Out vertical tubing is 22". The lower loop is 12" tall. The total tubing run is just under 7ft long.
If you purchase a fermenter from us that is compatible with this coil, we will drill the holes in the lid for you free of charge. Another option is if you're buying a Fermonster pressure transfer kit from us (it includes a modified solid lid), we can drill and install the grommets for you if you're buying this coil.
The coil will fit into fermenters with a minimum top opening of 3" diameter. Examples would be buckets, FastFerments, Fermonsters, Chapman Univessels, etc. Minimum fermenter depth would be 13". If you have a fermenter this shallow, can reduce the In/Out tubes to some shorter length, just note that in the order comments.
Two 3/4" holes will be drilled in the lid of the fermenter, the included rubber grommets are inserted and the tubing of the coil is pushed up through the grommets to the desired depth.
How does this work? You'll use a temperature controller like the Inkbird 308 WIFI on the fermenter and when it calls for cooling, it turns on a submersible pump that pushes cooling fluid through the coil. The easy solution is using a glycol chiller for this fluid because it is hands off. The budget version is to fill a large cooler with icewater though it is a compromise because you will need to add ice regularly and cold crashing is not practical. Be realistic with your cooling goals. An icewater system will likely be adequate for dropping 5-6 gallons of fermenting wort approximately 25F down from the ambient temps of the room. That means the ability to lager ferment if the room is 75F. Don't expect the ability to cold crash.
This is a brand new product for us and we haven't been able to do a lot of testing across multiple fermenters with various cooling fluid sources so we're offering a buy back for these. You have a month to try it out and if you don't like it we'll take it back and pay the return shipping for you (lower 48 states only).
FAQ:
What we CAN do:
Adjust the drop length of the I/O tubing
Adjust the height of the lower loop coil
Add an additional loop, subject to fermenter opening.
Put bends on the tops of the tubing
What we can NOT do:
Make the coil a tight vertical helix like what Spike offers.
Make one that fits inside a glass or narrow necked PET carboy.
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Great for fermonster 
BEWARE!