WARNING: See comments. The plastic parts of this espresso maker contain BPA. I am no longer using mine. H/t to Harry from Coffee Chap for getting the word directly from ROK.
Something a little more bobo than usual:
I was given a ROK manual espressomaker for Christmas, and have used it daily since to give an accurate characterization. One of the small amenities I sorely missed during the 13 days of cold blackout after Hurricane Sandy was morning espresso. (We made Turkish coffee on the gas stove.) With the ROK, as long as we still have natural gas and running municipal water, I will be able to drink espresso.
I have a solid background with consumer espresso machines. I broke a Saeco trying to clean the group head (the retaining screw stripped – the end) after 3 years; I burnt out the thermostat on a Francis! Francis! after 5 years and swapped its boiler parts into a 1980s Espresso Cialda after finding the latter in a basement with the filter basket missing. All those machines developed thermostat problems: after a couple of years they couldn’t regulate boiler temperature, overheating the water until the espresso was a thin, scorching brew.
Overall, the ROK makes an excellent espresso. It is a little more work than an electric pump-driven machine, but the quality and kinetic experience is worth it. But there are a couple of qualifications to my praise.
Materials
I used Doulton-filtered water and grounds from a Braun burr grinder. I had to use Starbucks espresso beans because that’s all I could get locally after trying illy (disgusting, thin, sour) and Gevalia (sour, thin, revolting) and Fairway’s bulk beans (artificial flavor fumes lingering). For years I bought the darkest roast I could get in bulk at Costco, but they stopped carrying anything above a medium Colombian Supremo. I must start ordering online.
Tamping the grounds
You will note that the included spoon has an ergonomic divot for pressing with your thumb while tamping the grounds. This is because a firmer pack than used with electric machines yields better taste and crema.
Water temperature
The ROK, into which you must pour boiling water and then press it out with an action like that of a wing corkscrew, won’t suffer thermostat failure. But its body is an alloy that loses heat quickly, and requires preheating of everything to get a passable brew. You must fill it to top with boiling water, let it sit a moment, then flush it through the empty basket, preheat the cup with kettle water (not the flush water which has already gotten much cooler), then half-fill the ROK with water for your espresso all in a short period of time. If you do that the espresso will come through warm, but never quite hot. Given the predictable failures of machines that cost up to twice as much, that’s not a big deal.
Crema
A review I found complained about the ROK’s crema, and it’s true: crema’s not easy to get. I found it works best when you make the cup, then add ~tablespoon more of boiling water from the kettle and press it through the grounds. The higher ratio of air to water in that second press almost always lends itself to a ready froth.
Construction
Generally, the construction of the ROK is solid and ingenious. But its finish will not stay perfect. This is because steam rises from the chamber where you pour the boiling water. The steam acts on the joint where the aluminum wings are pinned by a bolt that is probably stainless steel, causing galvanic corrosion. The finish of the ROK is highly polished and probably anodized, so where this corrosion happens the anodized layer cracks and aluminum oxidation (rust) happens in the cracks. It won’t affect its function but as you can see, aesthetic fetishists will be bummed.
Another flaw, this one more serious, is the choice of ridiculous rubber feet that stick to the bottom. As a metalworker, I can tell you that anodized aluminum is an amazing material. Almost anything (paint, adhesives etc.) will stick to it, much better than it would to raw aluminum. After anodizing and painting aluminum, it can be sealed to prevent anything sticking. So if the base were aluminum, I would have anodized it, stuck the feet on, then sealed it.
But the base must be corrosion-resistant because standing water and coffee residues will sit on it. You can see a seam where it is bolted to the main body. As such it is almost certainly a chrome-plated zinc alloy (which makes me wonder if the entire body is not that, maybe that zinc-aluminum-magnesium-copper alloy I’ve seen used in jewelry…but the finish-cracking around the joint mentioned above suggests aluminum). The very chroming that strengthened the base’s finish made it too sheer a surface for sticker-feet to cling to, and one popped off this morning. Since the user presses down with equal force on the two arms, effective use requires that the unit be skid-proof. Eventually all four feet will come off and you’ll need to apply a full-bottom adhesive rubber base, covering the “designed in London, made in P.R.C.” language—nothing lost.
I set the base atop cloth on the countertop and that consistently works well. I can get a decent crema just by raising the arms fully again after the espresso begins to pour from the portafilter and resuming pressing down.
Andrew, you’re right, the relift improves the crema! Saves me the trouble of that second tablespoonful of hot water. Thanks for the helpful comment.
While I’m here, I should also mention that flushing 2 chambers of boiling water through before making espresso with the third helps with the low temperature — but I can’t usually be bothered.
very interesting review…shame ROK didn’t clearly see this coming despite the improvements! Have linked you!
thanks for the link Harry. Glad it was helpful.
Postscript: I hope the seal of silicon to portafilter is hermetic, b/c the same corrosion is happening in the chamber. Aluminum alloys have a way of protecting themselves against environmental hazards, and as you can see it’s not just a patina as with brass…
perhaps the 10 Year Warranty on metal parts might just be worth it then!
They’d probably honor it if the parts became inoperable from corrosion. I’d be surprised if they would for surface finish—claims would eat them alive.
are there any parts that you can see would break off eventually due to corrosion?
Definitely not. It’s all very thick casting.
But the cosmetic issue will doubtless chafe a lot of people. For my part I just don’t want to drink any metal oxides, which generally are not desirable dietary supplements.
“For my part I just don’t want to drink any metal oxides” me neither!
Just one question I have and haven’t found an answer for and that is whether the plastic water chamber is BPA Free (bisphenol A; an industrial chemical!)? I know the Aeropress unit, when they were launched, were found to have had this in the product manufacturing process, but soon changed the process after health concerns over BPA .
Is the ROK Espresso Maker plastic water chamber BPA Free?
Harry, I’d love to ask the company that, and if I get around to it I will certainly update here. (I despair of the answer we want, though.) I’ve corresponded with their PR department and will make a note to dash off an email.
Given that brass alloys sometimes contain lead, and that my Francis! Francis! portafilter flaked chrome from the inside of the double portafilter spout where it wouldn’t be noticed (!), I bristle that we have to interrogate manufacturers so. We shouldn’t have to wait until we are doddering and drooling to prove that lead and chrome have done us more harm than old age.
I contacted ROK PR here in the UK yesterday as there was no real data in the box the ROK came in, and after an hour they got back to me; a lady, who really didn’t know the product at all, and was reading from a manual she had in front of her, and after all that she didn’t know the answer! Let’s put it this way, if the plastic water chamber was BPA Free, you’d use that in your PR campaign to reassure folks that it was all perfectly safe; the Aeropress, was quickly re-manufactured after it was found to have BPA in it’s material! We await proof!
“made in P.R.C”
I’ve just had it confirmed from ROK, that there IS BPA (bisphenol A) in the plastic, and to me that is no good where hot water and plastic is concerned in the process of making an ‘espresso’ using the ROK!
Thanks Harry, though I am gutted to hear that. I hope that my few months’ exposure to ridiculous levels of BPA (hot water=55 times the normal levels that leach, and I read somewhere else that BPA continues to leach out for at least 10 years) won’t affect my health adversely. I don’t use plastics much of anywhere else.
Though apparently BPA-free plastics have their own issues. The convenience of plastics is just not worth the risk.
Shame on ROK for ruining what was a brilliant product with some seriously lazy manufacturing. Now I don’t even know what to do with the damn thing.
I’m returning my unopened ROK imminently!
All in all, the presentation and design of the ROK looks great and is well packaged, but such cost cutting measures using inferior materials, does not bode well for what could be a first class portable espresso unit! Let’s hope ROK, are listening, and we await v3 with bated breath!
Put your health first, Avoid!
Received from Diane Beaumont Sales and Marketing Assistant
db@presso.co.uk—> “Thank you for contacting us about the ROK. There is no issue with BPA and we are therefore not considering a BPS free version.”
I have a feeling that if there is enough outcry from the public then there will be an issue. Meanwhile, I agree …AVOID.
Hi! I plan on getting this ROK Espresso Maker as a gift for my husband. i am debating between Polished metal frame or Copper (http://www.wholelattelove.com/products/rok-espresso-maker-in-copper). Which one would you recommend? Copper one is 50 bucks more but will it eliminate construction flaws of ROK Espresso Maker you listed in this post. Thanks!
Hi Rhea,
I don’t think the aluminum versus copper choice is particularly material, given the issues with BPA (or hormone-impacting plasticizers in general) that, as far as I can tell, persist in the copper incarnation of the product. The construction flaws in the aluminum model were cosmetic anyway.
Given that ROK has expressed indifference to the possible health impacts of BPA, and that BPA-analogues are problematic as well, I would, and do, stay away from ROK entirely.*
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*I’ll give you a deal on my aluminum model if you sign a waiver. 😉