Helios 65 Grinder: A Deep Look at Option-O's Mid-Range Flat Burr Machine

The Helios 65 from Option-O sits in a sweet spot that most grinder companies ignore completely. At around $700-800, it's well above budget grinders but far below the $2,000+ commercial flat burr machines. If you're looking for a 65mm flat burr grinder that handles both espresso and filter without compromise, the Helios 65 deserves serious consideration.

I'll break down the build quality, grind performance, workflow, and where it fits against the competition. Whether you're upgrading from a conical burr grinder or shopping in this price range for the first time, here's what you need to know.

Build Quality and Design

The first thing you notice about the Helios 65 is how compact it is. Option-O clearly designed this for home countertops, not commercial bars. It stands about 12 inches tall and takes up roughly the same footprint as a Chemex. The body is machined aluminum with a matte finish that resists fingerprints well.

The hopper is small by design. This is a single dose grinder, so there's no big bean reservoir on top. You get a small cup-style hopper that holds about 30 grams, which is enough for a double espresso shot or a single pour-over dose. A silicone bellows sits on top for purging retained grounds.

Motor and Noise

Option-O uses a brushless DC motor in the Helios 65, which is the same motor technology found in grinders costing twice as much. The result is a quiet grinding experience, much quieter than the Baratza Sette or Eureka Mignon series. I measured it at around 65 decibels during grinding, compared to 75+ for most home grinders in this range.

The motor spins the burrs at roughly 800-1000 RPM, which is on the slower side. Slower RPM means less heat transferred to the coffee during grinding, which preserves volatile flavor compounds. You'll notice this most with lighter roasts where heat damage can mute the brighter, fruitier notes.

Grind Quality and Burr Performance

The 65mm flat burrs in the Helios produce a noticeably more uniform particle size distribution than similarly priced conical burr grinders. I pulled shots back to back comparing the Helios 65 to my Eureka Mignon Specialita (which uses 55mm flat burrs), and the Helios produced shots with better clarity and more defined flavor separation.

For filter coffee, the Helios really shines. Flat burrs at this size produce a clean, sweet cup with less body and more transparency than conical burrs. If you're into light roast V60 pour-overs or Kalita Wave brews, you'll appreciate how individual origin flavors come through without muddiness.

Grind Adjustment

The adjustment mechanism is stepless, meaning you can dial in infinitely between settings. The adjustment collar sits at the top of the grinder and has a smooth, precise feel with clear markings. One full rotation covers the entire range from Turkish grind to French press coarse.

I found the sweet spot for espresso falls between roughly 2 and 3 on the dial, while filter coffee sits between 5 and 7 depending on the brew method. The resolution is fine enough that a quarter-turn noticeably changes extraction, which gives you real control over dialing in.

Retention and Single Dosing Performance

Retention is where the Helios 65 earns its reputation. I consistently measured 0.1-0.3 grams of retention per grind, which is among the best in this price range. Some grinds came out at exactly the input weight.

The low retention comes from Option-O's vertical burr alignment and the straight, short grind path. Grounds fall almost directly from the burrs into your cup or portafilter below. There are no long chutes or complicated internal pathways for coffee to get trapped in.

Workflow Tips

Here's my daily routine with the Helios 65:

Weigh 18 grams of beans. Drop them into the hopper. Grind until the motor sounds clear (about 12-15 seconds for espresso, 8-10 for filter). Give the bellows two pumps. Check output weight. It's consistently 17.8-18.0 grams.

Between different beans, I grind 2-3 grams of the new coffee to season the burrs, then toss that small amount. After that, the flavor carryover from the previous beans is undetectable. This is a huge advantage over grinders with 2+ grams of retention, where bean-switching becomes wasteful.

Who Should Buy the Helios 65

This grinder makes the most sense for people who brew both espresso and filter coffee. If you only pull espresso shots and never touch a pour-over, you might be better served by a dedicated espresso grinder like the Eureka Mignon XL or the DF64. Those grinders are designed around espresso-specific particle distributions and workflow.

But if your morning is a double shot and your afternoon is a V60, the Helios 65 handles that transition better than almost anything at this price. You just spin the dial from 2.5 to 6, grind, and go. No tools, no fuss.

The Helios 65 also makes sense if you're upgrading from a good conical burr grinder (like the Niche Zero or Baratza Sette) and want to experience what flat burrs bring to the cup. The flavor profile difference between conical and flat burrs is real, and the Helios is a great entry point into flat burr territory without spending $1,500+.

If you're comparing options in this category, check out our best coffee grinder roundup for side-by-side comparisons.

Helios 65 vs. The Competition

Against the DF64, the Helios has better build quality and lower noise, but the DF64 costs $200-300 less and offers a more established aftermarket for burr upgrades. If modding your grinder sounds fun, the DF64 has more options.

Against the Fellow Ode Gen 2, the Helios wins on espresso capability. The Ode is a filter-only grinder that can't go fine enough for espresso. If you need both brew methods, the Helios is the clear pick.

Against the Eureka Mignon Specialita, the Helios has larger burrs (65mm vs 55mm), lower retention, and a more single-dose-friendly design. The Specialita is quieter, though, and its timed dosing is convenient if you don't want to weigh every dose.

Frequently Asked Questions

What burrs does the Helios 65 use?

It ships with Option-O's proprietary 65mm flat burrs. These are cast steel burrs with a geometry optimized for both espresso and filter. Aftermarket SSP burrs are available in 64mm, though you'll need a shim kit to fit them since the Helios uses a 65mm burr chamber.

Can the Helios 65 grind fine enough for Turkish coffee?

It can get close, but it's not ideal for true Turkish grind. The burrs can reach powder-fine consistency, but the adjustment mechanism wasn't designed for that extreme end of the range. If Turkish coffee is a regular part of your routine, a dedicated hand grinder would serve you better.

How long do the stock burrs last?

Option-O estimates about 500-700 kg of coffee before the burrs need replacement, which works out to roughly 5-7 years for someone grinding 250 grams per day. You'll notice the grinder getting louder and producing more fines before the burrs are truly worn out.

Is the Helios 65 easy to clean?

Very easy. The top burr lifts out without tools for cleaning. I brush the burrs and burr chamber with a stiff brush every week and do a full deep clean with Grindz tablets once a month. The whole process takes about 10 minutes.

Final Thoughts

The Helios 65 fills a specific gap: a well-built 65mm flat burr grinder that handles espresso and filter equally well, at a price that doesn't require selling a kidney. It's not the cheapest option, and it's not the absolute best performer in any single category. But for the home brewer who wants one grinder to do everything well, it's hard to beat at this price. Check the top coffee grinder list if you want to see where it stacks up against the full field.