This review is by Homebrew Finds Reader Benji S.  Benji has been brewing for 10 years.  His favorite style is Festbier.  He’s an all grain brewer and member of WIZA (Whidbey Island Zymurgy Association).  Check him out on Instagram at neon_hop

After well over a year of evaluating, I splurged recently and got a Spike Conical (the CF5). I’ve seen quite a few others going through this debate period, so I wanted to provide a hot take to help others in their own decision making process. So far I’ve assembled and prepped it for my first brews, but haven’t actually used it yet. Most of the points here will be about equipment quality/features rather than practice.

For context; I added on the temp control bundle with heater, leg extensions, casters, extended bracing shelf, and a few other nice to haves. So some of these will cover things that aren’t part of the “core” conical package.

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• Complete Spike Lineup at Great Fermentations
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This review is by Homebrew Finds Contributor Brad Probert.  Brad is an engineer, expert homebrewer and experienced reviewer.  Grab a link to Brad’s website at the end of this review.

Spike Flex Stainless Fermentor

Stainless steel is highly valued in homebrewing because of its durability and ease of cleaning. When used in fermentors, this ease of cleaning means you don’t spend as much time scrubbing yeast crust and dry hop debris off the walls of your vessel when done fermenting. And since your beer spends so much time in contact with the surface of your fermentor, it’s easy for aromas to leech in over time to plastic fermentors. Glass of course doesn’t have this problem, but it does have the problem of shattering if you drop it.

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• Complete Spike Lineup at Great Fermentations
• Complete Spike Lineup at Beer & Wine Hobby

Spike is well-known for their heavy duty stainless kettles and free-standing conical fermentors. With all that stainless laying around in their shop, it’s no surprise that they’re now entering the category of “stainless bucket fermentors”. These bucket fermentors are smaller in size than the long-legged conical fermentors. What’s surprising to me is the price difference between the stainless bucket fermentors and taller conical fermentors. Even with the same holding capacity, you’re paying a few hundred dollars extra just to get a conical fermentor up on stilts. The stainless buckets offer essentially the same features, they just require you to crouch down- which to me, is an acceptable compromise.

Weld Flange from the Outside
TC Flange Seamless Surface in Contact with Beer

Spike’s new Flex fermentor is a bucket fermentor (crouching required) that has a 7.5 gallon volume, and has a 45-degree angle cone on the bottom. Utilizing the same 1.5” TC flanges that they’ve mastered the welding with their Spike+ kettles, you can interchange pieces from the Spike accessory catalog for a thermowell and a draining valve. It comes with a rack arm when time to drain that can be rotated by loosening the 1.5” TC clamp slightly and turning it. That feature is designed for those that want to take advantage of avoiding the fallen yeast that has collected in the 45-degree cone, but want to rotate the arm while draining to try to get as much viable beer out of it as possible. And the racking arm has a simple but ingenious bump welded onto it so you know which direction the pickup tube is pointing while you’re trying to rotate it from the outside .

Polished Interior with Etched Volume MarkPickup Tube Rotated Down into Cone

The fermentor walls are ultra-polished. While this has a super-glam aspect that’s sure to dazzle your friends, it serves a practical purpose as well. The polishing process eliminates any kind of surface roughness, which makes it even easier to clean. The inside of the vessel contains electrically etched black volume markings every 0.5 gallons, the same as they have on their kettles. The base is supported by 3 sturdy legs with rubber caps on them to keep it from sliding around on floors (or scratching your floor).

Lid Clamped on with Seal Visible

The lid looks like something from a 1920s diving helmet. In the middle of the lid, there’s a giant 4” TC port that holds a polished clear hard plastic window so you can easily see what’s going on inside your fermentor without having to open the lid. The base Flex model has a hole for a rubber stopper and airlock, and 5 latches that hook over the edge of the lid and onto a flange on the base. This base latch and seal set-up is capable of holding 2 psi of internal pressure. The Flex+ model uses a band clamp that goes around the circumference of the lid and tightens down with a screw/nut feature. And the hole for the bung/airlock is replaced by another 1.5” TC port. This ups the pressure holding capability of the unit to 15 psi.

With its short & stout size, the Flex can fit in shorter areas, but it is pretty wide. From the bottom to the top of a 3-piece airlock, it stands 22” tall. The widest diameter, with the stackup of the racking arm and a Spike butterfly valve with a camlock fitting at the end of it, is 21” across. If those dimensions don’t work for your fermentation chamber, Spike also has a version of its TC-100 temperature control system available that makes use of some common components from their unitank conicals and a form-fitted neoprene jacket sized to the Flex dimensions.

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