The Best Conical Fermenters With Temperature Control

The question behind the question

You are buying a solution to height

Nobody searches for a temperature-controlled conical because they want an extra feature. They search for it because their fermenter does not fit in anything. A welded conical with a full cone and a stand is taller than a 5 cubic foot chest freezer is deep, and the moment that becomes true the normal homebrew answer -- a freezer and a dual-stage controller -- stops working.

Integrated cooling solves the geometry problem by moving the cooling surface onto or into the vessel. A glycol jacket is a channel in the wall. A cooling coil is a stainless loop inside the beer. Either way heat leaves through metal in contact with liquid rather than across an air gap, which is both faster and completely indifferent to how tall the vessel is.

So the first thing to establish is whether you have the height problem at all. Measure the inside depth of the chest freezer you can actually fit in the space, then measure the vessel with its stand and its lid fittings. If the vessel fits, buy the freezer and the dual-stage controller and stop reading.

Jacket vs coil

Two ways to put cooling on a vessel

The glycol jacket

A jacket is a sealed channel built into the vessel wall at the factory. Glycol flows through it, never touching the beer, and the whole wall becomes the heat exchanger. It is the commercial standard and it is the best version of this idea: large surface area, nothing inside the beer to clean, and nothing to retrofit or get wrong.

The cost is that a jacketed vessel is a jacketed vessel forever. You cannot buy one and use it without a chiller, so the glycol loop is part of the purchase, not a later upgrade. For the Ss Brewtech Unitank that also means the carbonation and serving features are available from the same vessel, which is a genuine process simplification -- see conical vs unitank.

The cooling coil

A coil is a stainless tube that hangs inside the fermenter with glycol running through it. It is cheaper to manufacture, it can be specified as an option on a conical that would otherwise be uncooled, and it chills quickly because it sits in the liquid rather than outside it.

The trades are real. A coil is a surface inside the beer, which means it has to be cleaned and sanitized like everything else, and it takes up a little volume. It also cools locally, so a coil without any circulation produces more stratification than a jacket does. In practice neither issue is severe, and a coil-equipped conical is the cheapest honest route to glycol cooling.

The cheaper truth

A short conical in a freezer beats both on cost

There is an uncomfortable fact in this category: for a 5 gallon batch, a plastic conical short enough to fit a chest freezer gives you the same temperature stability as a glycol-jacketed unitank for a small fraction of the money, and a much smaller electricity bill.

The FermZilla Tri-Conical is the vessel that makes this work. At 27 L with a detachable collection butt it does the thing people actually want from a conical -- harvest yeast from the bottom and dump trub -- in a package short enough to stand in a 5 to 7 cubic foot freezer. Pair it with a controller and the temperature control problem is solved.

What you give up is durability and scale. PET crazes over years, the chamber holds one temperature for everything inside it, and you cannot crash cool as fast through air as through steel. If none of those limits bites, this is the right answer and the expensive vessels are a want rather than a need. The full comparison sits in glycol chiller vs fermentation fridge.

Sizing the cooling

Three things to get right before you order

• Decide jacket, coil or neither before you buy the vessel. A jacket cannot be added later and a coil is awkward to retrofit. This is an order-time decision, and getting it wrong means buying a second fermenter.
• Buy the chiller one size up from today. A quarter horsepower unit handles one or two homebrew vessels. If a second fermenter is plausible within two years, the chiller is the part you keep when the vessels change.
• Add a thermowell, not a taped-on probe. A probe taped to the outside of a vessel under insulation is a reasonable approximation. A thermowell puts the sensor in the beer and turns an approximation into a measurement. Both the Unitank and the CF5 have a port for one.

How we picked

The basis for these

Selected from published manufacturer specifications for cooling method, pressure rating, ports and capacity, plus documented homebrewer consensus on chamber sizing and vessel height constraints. We have not measured crash-cool rates across these vessels side by side and do not claim to. See how we pick.