Hario NXA-5 “Next” 5-Cup Syphon Coffee Maker

by Coffee Kevin on June 16, 2016

Flywheeel siphon sample 4 The Hario Syphon is perhaps the ultimate quality siphon, also long-known as a vacuum coffee maker. The Syphon works on the principal that near-boiling hot water in an enclosed lower vessel releases steam that expands, forces the hot water up through a tube into the upper bowl, where it is inherently the right temperature to brew coffee. As long as the lower bowl is kept heated, the water will stay up there, brewing coffee. The bubbling below causes the water in the upper bowl’s water to agitate the grounds, facilitating the extraction process. When the operator decides enough is enough, she simply removes all heat below and within about a minute the cooling and contracting vapors below cause the lower bowl to suck (hence the word vacuum) the finished brew back down into the lower bowl. Oh, did I mention there is always a filter between the two bowls? Haha, that alone is worth a patent. Siphons vary in the heating method (earliest samples were flame powered) material (glass is original and common, metal durable but no theater, plastic combines both benefits but it’s plastic) and filter type. The filter type is likely the most important of the variables to affect taste, and I’ll go into that later.Syphon overhead froth Should history ever agree to repeat itself in a different order, I’ve long felt the siphon would have been the ideal brewer to replace drip. After all, the siphon fixes the following drip issues:

  • Grounds to Water Ratios remain constant when making different size batches.
  • Easy to maintain in-standard brewing temperature.
  • Grind is less critical because it has no effect on contact time.

There may be other benefits too. But, in an effort to keep this review from taking my record for the all-time windiest, let’s now cut to our Hario version on the test bench. It’s a beauty all right. I promise not to let looks intoxicate me, but as with my marriage, I’m a sucker for looks. And this one’s a knockout. But, can it make coffee? And how! The Hario Syphon and its companion infrared heater are amazingly competent in that ability. This is a completely professional kit for any barista. Best of all, for the well-heeled devotee, it offers perhaps the ultimate home siphon setup. Syphon majesticYou get:

  • A lower bowl on a sturdy metal stand. The glass is clearly a thick, robust, tempered type. The upper bowl’s stem (in my experience) is often prone to breakage, but with this unit so far, no such problem.
  • Two filter types. You get the original cloth filter, that is most effective and (I think) the original method, offering the cleanest, clearest coffee. You also get a Hario-designed metal filter which effectively filters and apparently matches the flow rate of the cloth one, so they are interchangeable. More sediment but that’s what metal filters do. Much more convenient.
  • Infrared heat. To me flames take too long, the liquid fuel is a hassle and flames vary in temperature due to air flow. To be honest, infrared still isn’t fast enough for me, but it looks beautiful and is wind resistant.

Say What You Think, Kev… I absolutely think this siphon is the best one I’ve yet used and I’ve used lots of them. It brews some of the best coffee I’ve ever had, which is saying a lot. But……… all siphon brewers I’ve yet tested have the following potential issues:

  • Variable contact time. Try though I may, I find the idea of shutting off the heat and then expecting the coffee to dutifully drop back through that filter to the bottom again varies a bit. I’ve done pretty well overall. After some practice with this unit I was able to get a four minute contact time within fifteen seconds most of the time… but, not always. Compared to drip or other full immersion methods such as French press, the siphon varies more and I see no solution to this. I made one last batch before starting to write this review and I had a nearly six minute extraction. The coffee still tasted fine, but it is worth noting for those to whom it matters.
  • The cloth filter is a hassle. Not this one in particular. All of them. If you’re an occasional user, it’s practically a no-go as storing the cloth filter requires cold water, a spot in the refrigerator to keep it cold, and frequent water replenishment. If you use the cloth filter often they are prone to absorbing built-up coffee tastes. The stainless filter, which I admit I used for most of my testing, allows fine sediment through. Paper, my personal filter material first choice is not an option. (Update: See below under tweaks for just such an option.)
  • Heating, even with the fancy infrared heat source, is not fast. Compared to coffee brewers such as Bunn’s Phase Brew, Kitchen Aid’s KCM0802, OXO’s 12-cup Barista Brain and others that get the water to SCAA certified brew temps before contact begins, the room-to-ideal temperature on this siphon brewer using the Infrared heater is roughly ten minutes. Too long. I learned quickly to heat the water in a separate kettle first. Solves the problem and not that big a hassle, but still an extra step.

Syphon closeup So, recommended or not? I will never knowingly write anything but the truth in this blog. While I acknowledge that this brewer still requires more active concentration from the end user, I also know it makes some of the best coffee I’ve yet tasted. No getting around it. For ultra-fresh coffee, very good quality coffee, roasted to its more flavorful degree, the Hario Syphon does a unique job. Carefully used, you can get a very thorough extraction, full of fruit and complexity. You truly feel you are tasting deep into the coffee. So, yes, highly recommended, with the caveat that you must become part of the task of brewing it. It is not yet truly automated in this product, and if used in a way that is automated, you are, in my opinion, giving up flavor in exchange. How Do I Use It? There are lots of ways to use a siphon or vacuum brewer. Here’s my personal method.

  • Heat four cups of water in an electric kettle to 200°F.
  • Weigh 38 grams fresh roasted beans and grind them a coarser than auto-drip but a notch or two finer than for Chemex drip (coarse).
  • Once water is heated to 200°F, transfer it to the empty glass bottom half and place on infrared heater. Turn heater on to maximum or one notch less.
  • Place empty upper mixing vessel with filter inserted into lower half so that they fit snugly together.
  • After water has completely risen scoop or pour grounds into top half. Very gently stir near top to ensure all grounds are wet. Start timer.
  • At one minute begin another few seconds of stirring. Do not stir downward, as I found if you do, there’s a risk that some amount of brewed coffee will work itself down into the bottom half. Reduce heat a few notches after stirring.
  • At two minutes stir gently again. Lower heat a notch or two.
  • At three minutes, stir one last time.
  • At around three-twenty, turn off heat. After a few seconds, the coffee will begin its final descent into the lower bowl, which becomes a server upon completion.
  • When the coffee has completely returned to the bottom, carefully unplug the upper bowl, remove it and place it in the top coffee, which when upside down, becomes a holder for the spent grounds.
  • Serve.

Tweaks

You should know that I notice a significant difference between using a cloth and metal filter. The cloth does a more thorough job removing grounds, some might say ideal, although I’ve been around coffee long enough to know that ideal is a subjective term. Let’s just say it’s my favorite. At the recent CoffeeCon NY festival I noticed Georgio’s Coffee’s Georgio Testarossa using a siphon to brew his own delicious fresh-roasted coffee. I also noticed the brew’s viscosity matched my own using the cloth filter. I asked if he was using cloth. “No, paper”, he responded. “Paper”, I exclaimed. Then he disassembled his filter to reveal how he’d cut matching circles from a Bunn filter. Look at the amount of fine grounds a little paper can hold back. It's up to you. Some people use fine grind for vacuum. I used to, but lately I’ve found a coarser grind to work best. Siphons can use any grind as grind really does little to affect contact time. Of course surface area exposure affects the taste strength; that remains. Using the metal filter I find the coarse grind reduces particles in your cup. I use close to what I’d use for regular drip.

Conclusion

The Hario Syphon is a gorgeous brewer that can make state-of-the-art coffee. I had both the single-knob and digital control base units. I found each to work well. The digital control unit will appeal to anyone who enjoys its programmable features, although to be honest, I didn’t explore them. Different article. The filter options are enough to make me choose this vacuum unit. I never felt the glass was fragile and had no incidents nor near-incidents during my tests. About the only thing missing compared to drip pour-over such as a Hario V60 is the ease of controlling brewing temperature. Vacuum/siphon is high-temperature brewing, inherent in the process. But the results are impressive. Any time during my time with this unit that anyone came to visit they immediately noticed the unit. Whenever I offered to make coffee and asked if they had a preference, the unanimous response was to point directly at the Syphon and say, “That one!”

Unhesitatingly, highly recommended.

{ 2 comments… read them below or add one }

David April 29, 2017 at 8:29 am

I just bought this and followed your instructions but was wondering how much water you used (where do you fill up to) when you use 38 grams? I mostly make coffe for just me so I don’t know if there’s a good partial portion option. Thanks for the info! I love using the cloth filter.

Reply

Coffee Kevin May 4, 2017 at 10:54 am

Hi David,

I tested to a full batch, which on that brewer means filling it to the 600 ml line. If I recall, the instructions that came with it recommended 38 grams. Yes, you can brew a smaller amount. One of the benefits of steep methods such as siphon or press is taste consistency when brewing at various batch sizes. It is much harder to maintain consistency when brewing smaller batches in a drip maker. I’d just use half the amount of water and 17 grams of ground coffee. Yes, the smaller batch may return to the bottom carafe more quickly, shortening the contact time. But, that means next time, just leave it up there a few seconds longer. I frequently use a siphon when making a cup for myself.

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