Best RTAs 2019
April 5, 2016

Vaporesso Gemini RTA Review

Vaporesso Gemini RTA Intro

I checked a number of text and video reviews of the Vaporesso Gemini RTA. I don’t normally do that before writing a review for a product I’ve not used, in part because I don’t want to be unconsciously influenced by other reviewers’ opinions. In this case, the Gemini RTA had no manual in the box — only a tiny card with a few drawings parts and construction of the tank — so I wanted to orient myself to setting up the tank. In every single review I checked, the Gemini RTA was compared to the Geekape Griffin RTA, either in passing or at length.

I don’t own the Griffin and haven’t vaped it, but apparently the Griffin has become the gold standard among RTAs this year. My review won’t put the Gemini up against the Griffin, because I have no basis for comparison. I will, however, contrast the Griffin to SMOK’s new TF-RTA, since I reviewed that tank earlier this week.


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Vaporesso Gemini RTA Specs and Features

  • 1 Gemini RTA
  • 1 Gemini Replacement Glass Tube
  • 1 510 Drip Tip
  • 1 510 Drip Tip Adapter
  • 1 Allen Key
  • 2 Prebuilt Clapton Coils
  • 4 Spare Allen Screws
  • 4 Spare O-Rings
  • 1 User Manual
  • 22mm Diameter
  • Large Build Deck (Velocity Style)
  • 2mm Post Holes
  • Top Fill Method
  • Delrin Wide Bore Drip Tip
  • Glass Tank
  • Stainless Steel Construction
  • Four Cyclops Adjustable Airflow Holes
  • Adjustable Top Airflow
  • Bottom Airflow Below Coils
  • E-liquid Control

Notable Remarks

The Vaporesso Gemini RTA has all the features that have become standard on most current-generation RTAs:


Vaporesso Gemini RTA Deck
Vaporesso Gemini RTA Deck

Infinitely-adjustable air intake from both the base and top cap, with four air slots in both locations. Machining and fit are good, with smooth but firm adjustment by the rings that cover or expose the slots. Draw is adjustable from airy when the slots are wide-open to restricted with more resistance when the slots are closed off. I think the Gemini is probably suitable for mouth-to-lung inhaling with the tighter draw of closed slots, but I’m so accustomed to direct-lung inhaling now that I seem to have lost the ability to do MTL, so I can’t be sure.

E-Liquid Flow Control

Vaporesso Gemini RTA Deck
Vaporesso Gemini RTA Deck

E-liquid flow control via four slots on the coil chamber inside the tank. These are opened or closed by holding the base and turning the glass mid-section of the tank.

Build Deck

Vaporesso Gemini RTA Deck
Vaporesso Gemini RTA Deck

The build deck is spacious, with Velocity-style dual posts, each of which has a pair of holes for coil legs. Grub screws on the sides of the posts secure the wires, and the machining of the screws and threads seems solid and dependable. Vertical quad coil builds might be possible, but the deck is designed to accommodate dual coils.

I didn’t use the pre-wrapped 2.5mm diameter Clapton coils included in the parts bag. Despite the popularity of Clapton wire, I prefer the simplicity of 26-gauge 316L stainless steel, so that’s what I used to wrap my own coils for the dual-coil build. My build came in at 0.22 ohms, and I wicked the coils with Kho Gen Do organic cotton. I’m an old hand at making my own coils, but I’ve not evolved into complex or exotic builds. Simple spaced or contact coils have kept me a happy vaper.

Top Fill

Vaporesso Gemini RTA Top Fill
Vaporesso Gemini RTA Top Fill

The top cap is a two-piece unit. The bottom part secures the glass tank, while the top part with the drip tip screws off to reveal two large, wide slots for top-filling. That design works well, but I prefer SMOK’s swiveling top cap. No quibbles, though, as filling or topping up the tank with e-liquid was easy and leak-free.

Almost Leak-Free

Vaporesso Gemini RTA Taken Apart
Vaporesso Gemini RTA Taken Apart

Through the first two tanksful I vaped, the Gemini never leaked, not so much as a single drop during vaping. Immediately after refilling, some seepage occurred from the bottom air slots before the internal pressure equalized, but turning the tank over for ten seconds stopped that.  For the most part, everything stayed dry as a bone. That doesn’t guarantee that the tank won’t leak in the future, but it’s a very good sign that impressed me, since it enhances the pleasure of using the tank.


Vaporesso Gemini RTA
Vaporesso Gemini RTA

With my simple build, I found that the sweet spot of the Gemini was at 45 watts. 50 watts was also good, but I sensed the limits of adequate wicking not too far off. At 60 watts, my build entered dry hit territory. I assume that my build and wicking are responsible for the dry hits at that power. I’ll bet the Gemini could handle higher power with more perfect wicking.

Vaping the Gemini at 50 watts was satisfying but not extraordinary. Again, that may have more to do with my build than with the tank’s inherent capabilities. Flavor was satisfying, while vapor production was good, if somewhat less than room-filling.

I liked the vape best with the air slots halfway open, because it intensified the flavor and thickened the vapor without constricting the draw much. The airiness of the draw with wide-open air slots (top and bottom) was fine, but flavor and vapor production were slightly diminished that way. As far as I’m concerned, the Gemini is primarily a flavor tank rather than a cloud machine.

I’d rate the overall vaping experience of the Gemini RTA at about 80% of what I get with the SMOK TF-RTA. That may be an unfair apples-to-oranges comparison, since I used the larger 3mm-diameter pre-installed Clapton coils on the TF-RTA, while I chose a simpler 2mm-diameter single-wire dual-coil build for the Gemini. In addition, I run the TF-RTA at higher power (70 watts versus 50). In essence, the TF-RTA wins because everything about it is bigger.

In a different contrast, coil sizzle was less audible on the Gemini compared to the lovely crackle I get from the smaller, mini-sized iCloudCig Moradin tank at similar power. (I reviewed the Moradin RTA recently, and I’m very enamored with that little tank.)


With a spacious deck that’s easy to build, simple top fill, minimal leaking, and very good performance, the Vaporesso Gemini RTA has much to recommend it. Overall, the Gemini beats the hell out of most earlier-generation RTAs.

For me, though, the Gemini doesn’t match the superb vaping experience provided by either the huge SMOK TF-RTA or the diminutive iCloudCig Moradin. Those two RTAs are amazing and my current personal favorites.


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My name is Bill. I’ve been a dedicated vaper for five and a half years, having ended a 35-year addiction to tobacco cold-turkey on my first day of vaping. I live on the Oregon coast, in the tiny town of Florence, one huge sand dune away from the Pacific Ocean.

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Well, damn. Having suffered the glass section of the Gemini RTA cracking — I didn’t drop it or abuse the tank in any way, the glass just cracked all on its own — then ordering five “Authentic Vapesoon Glass Tanks for Vaporesso Gemini RTA” from Fasttech, then waiting for three weeks to get them, they were finally delivered today. And guess what?

THEY DON’T FIT! The glass tubes are too 3mm too long. The top cap won’t thread onto the chimney. I even removed the rubber o-rings from the cap and base (not that I’d run the tank that way), but just to see if the replacement glass sections would fit without the o-rings. Nope. Still too long.

What the hell is wrong with these companies???

Nguyễn Thiên Trúc

This thing is leak like hell. I was using 3 days and go straight to market to get the Griffin 25.


OK, today (April 14th) I swapped out my simple stainless steel spaced coils, which registered at .22 ohms for the dual build, and installed the larger Clapton coils that were included in the Gemini’s parts bag. Resistance of the dual setup came in at .53 ohms. The Velocity deck with dual-hole posts is a joy to build on. Easy as pie.

With the Clapton coils, draw remained the same, along with the tank’s quiet performance at relatively low wattage (50W) — still no sizzle or crackling of the coils when fired. I like some sizzle, but for vapers who appreciate a quiet, very smooth tank, the Gemini is a champ at moderate power.

In other ways, however, the improvement in the vape experience was meaningful. Power capability was significantly boosted with the Clapton setup. The wicking of my simple 2.0 mm spaced SS coils could handle about 50 watts. Similar but slightly more cotton wicking for the larger 2.5mm Claptons boosted the power limit to 70 watts (and brought some lovely crackling of the coils). At that power, the vape was warm, but not at all hot, as was the tank itself. I think the Gemini could handle even higher power with this setup, but I felt no need to push the envelope. 70 watts provided a terrific vape, with full flavor and thick mouthfeel, and wicking kept up easily, without even the hint of a dry hit. Closing off the top and bottom air intake slots halfway intensified the flavor without diminishing vapor production.

As I predicted in my post below, my appreciation for this tank grows with each passing week. I’d now give it at least an 8.0 on a scale of 10, perhaps even 8.5. The Gemini won’t get a 10 from me because it’s a little leaky, especially right after filling. Even closing off the internal flow control and external air intake slots doesn’t prevent some leaking after filling. Turning the tank upside down for 10-15 seconds after filling does help to clear the chimney and let the internal pressure stabilize, but the first couple minutes of vaping can be somewhat messy. After that, there’s continuing evidence of juice buildup in the air slots, but no leaking. Once it stabilizes, the tank’s subsequent performance is very, very impressive.

I now consider the Vapresso Gemini a worthy contender to the larger TF-RTA and more diminutive Moradin RTA, and very much in their league. All three make a nice family — Big Daddy, Beautiful Mom, and Cute Baby. 2016 is quickly becoming a Golden Year for RTAs!


Along with a couple other RTAs I’ve reviewed recently, I’ve been using the Vapresso Gemini RTA for about a week now. I’m very pleased. The Gemini is a heck of a nice RTA. I find myself playing around with the airflow often, altering the draw. Every different draw I’ve tried works well, from wide-open to tighter. I like an open draw with a little resistance, not quite airy, and the Gemini’s quad air intakes on both bottom and top allow the entire range of draw options with very fine adjustments. So, if my posted review could be considered as giving the Gemini about 7.5 on a scale of 10, I’d kick it up to 8.0 after four or five tank refills.

I intend soon to swap out the stainless steel spaced coils I built initially in exchange for the 2.5mm Clapton coils that were included in the parts package. I’m interested to see how the Gemini performs with the more sophisticated Claptons, and I’ll report any noteworthy differences here in the Comments section.


Hi bill, I just read this after reading your TF-RTA article. I have the same opinion regarding the gemini. I have been waiting for this since i saw photos of the all its features because i was really disappointed with the Griffin. But this tank disappointed me as well. The vapor production is good, that much is true, but for flavor, it leaves me unimpressed. I’ve changed the build a couple of times from kanthal to claptons, different configurations and still I find the flavors to be a bit muted on this tank.
Can you share one configuration you have with your build plus airflow arrangements that boost flavor? Right now, this thing gets my attention once or twice a day and I still cant find a good setup for this which gives me exciting flavors.
TF-RTA completely blows this out of the water. its too bad because i wanted this as my tank for when im out.



Since you mentioned in another comment about using the G4 quad deck of the SMOK TF-RTA, I’m sure there’s nothing I could tell you about coils and wicking that would enlighten you even a little bit.

As I wrote in my response below to RPad, I’m a very basic coil builder. Nothing fancy or exotic. Just ordinary spaced or contact single or dual coils — no twisted or clapton or flat — nothing bigger than 24 gauge and mostly 26, and Ko Gen Do cotton or rayon for wicking. Oh, I do all right with dual vertical rebuilds on factory heads, but I’ve never gone down the rabbit hole into Wonderland with RTAs or RDAs.

My take on reviews (including my own) for just about anything in vaping — hardware, juices, etc. — is that they’re 20% information and 80% entertainment.


I’m curious about this one. The center air post intrigues me. It looks like there’s a lot of experimentation you can do with the airflow.


Yes, that center post is unusual.

The Gemini is a good tank, Ray, like so many of the RTAs coming out now. Well thought-out and very well-made.

As is true with all RDAs/RTAs, assuming that the design is good, the vape a given tank provides is then largely dependent on the quality of the build. I’m an experienced coil-maker, but still just an amateur compared to those who’ve led the charge to exotic builds.

I’ll bet you can make the Gemini tank sing arias.


Nah, my skills are pretty average. These days, I prefer straightforward stainless-steel builds, just like you mentioned. 🙂

Jeremy Mann

Soon we will fix the pic for the eliquid flow control.

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