The Kaees Stacked RTA is a dual coil GTA Style RTA designed in collaboration with YouTube’s own Tony B and KAEES.
KAEES (KEYS) is a subsidiary of Shenzhen KAESEN technology ltd; they are an international e-cigarette brand based in China, with the focus of providing cost-effective atomizers to the industry.
KAEES have bought us in the past the likes of the Soloman RTA, Soloman 2 RTA, Aladdin RDA and RBA tanks the like of Pacer, Vane and Landmark.
Today we are going to take an up and close look at the highly anticipated (by this reviewer anyway!) The Stacked RTA! What do we think of it?
The Kaees Stacked RTA was sent to us for the purpose of this review. As always my thoughts and views are my own.
Kaees Stacked RTA Video Review
In The Box
- 1x Kaees Stacked RTA 5ml
- 1x 810 Delrin Drip Tip
- 1x Drip Tip Adaptor
- 1x Glass tube 3ml (2ml TPD)
- 2x Pre-made coils
- O-rings & Springs
- 1x ScrewDriver
- 1x Info Card
Main Specs/Features
- Extra glass tube included
- Adjustable bottom-up direct airflow control
- New top cap for easy top refill
- Acrylic (PMMA) 810 wide-bore drip tip with high heat resistance
- 810 Delrin Drip Tip
- Size: 24 x 46mm (without 510 thread)
- Capacity: 5ml/3ml/2ml
- Material: SS/Pyrex/Resin/PMMA
- Thread: 510 thread
- Colours available: Black and SS
Design and Build Quality
The Kaees Stacked RTA comes well presented in a card box with some spares.
Made of Stainless Steel, Pyrex, Resin and PMMA! The Stacked RTA is 24mm in diameter and 46mm tall not including the connection threads. The Stacked RTA, for me, is a fair design with a good quality of build. 
The RTA breaks into 5 parts for easy cleaning.
Base
Starting on the bottom of the base you have all your normal info.
510 threading with a gold plated connection pin, while the pin does stick out a little (although I wouldn’t be comfortable using this RTA on a hybrid connection). 
The airflow (AF) is a dual bottom Cylon type “whatever you set one side is duplicated by the other”, the AF ring is removable from the base for cleaning and is held in place by an O ring. 
Above the AF you have an O ring for the glass.The GTA deck has threading for the coil cover and is raised; there are 4 wick slots for your cotton 1 in each corner of the deck, 2 wide bottom direct internal AF slots. 
The physical appearance of the clamp build deck is slightly different, it looks like they have tried something original with the established velocity style build deck. The clamps are held by 2 screws on springs, the top clamp is SS while the bottom clamp feels like a resin material, the clamp structure while stable has some movement to it.
Glass
The bubble tank that is pre installed will hold 5ml of liquid the spare in the box holds 3ml, a 2ml version of the RTA is available to purchase for those in countries affected by the TPD.
Coil Cover/ Chimney/Fill Port
Made of SS is one piece, the coil cover screws on to the deck over the coils. The cover has a laser printed lion with crown emblem and the Chimney is short for better flavour (apparently) leading to the fill port, which is handled by 2 large kidney shaped slots.
Cap
Made of SS this has a crown like grip decoration to aid removal.
Mouth Piece/s
Both supplied tips are an 810 goon style, the pre installed drip tip is a frosted Acrylic (PMMA) that has a low profile of 6mm. The spare is made of black delrin with a profile of 9mm, a 510 tip adaptor is included that is made of delrin although it can be hard to remove once installed.
A Basic Guide to Coiling/Wicking
No need to empty this RTA when changing coils or cotton, turn upside down and unscrew the base from the main structure.
- Decide which glass is right for you (straight or bubble)
- Insert your coils as though this was a velocity style deck
- Insert your cotton
- Tuck the tails into the wick holes
- Pre wick your coils/cotton with e-liquid
- Reassemble the RTA
- Close off the AF
- Remove the top cap and fill the tank with e-liquid
Place the RTA on your desired mod, leave for a few minutes for the cotton to soak up more liquid before first fire.
Tips – I cut the coil legs at 4.5mm using my Coily Tool and pull the coil out so it is directly over the internal AF.
If you decide to use the 510 DT adaptor removal can be a pain! I find it easiest to use a screwdriver through the reverse side of the top cap to push the adaptor back out.
A word about coiling
Treat this deck like you would a velocity style deck! As you unscrew the clamps you will notice both will raise, place the first coil tail under the first clamp so it’s resting on the resin bar, place the second tail under the resin bar and make sure it is resting on the SS bar at the bottom.
Repeat for your second coil then clamp down your screws holding the coils in place.
How Does The Kaees Stacked RTA Perform?
For this review I have installed homemade dual 0.15Ω flat 24g SS316 coils, and filled the tank with a well steeped Dr Frost’s Remedy e-liquid (it tastes a bit like Calpol lol).
I’ve put the Stacked RTA on my Vaporesso Polar .
30w
With the airflow open 1/8 and using a Mouth to Lung style of vape, the AF was tight with a good flavour the vapour production was fair and quite warm, opening the AF up to a ¼ open keeping the wattage to 30w the AF was just right for a Direct to Lung draw.
The vapour quality was great and the flavour was good the warmth of the draw was to cool for me.
50w
With the AF open to half the vape was warm the vapour production was cloudy with a good flavour, opening the AF completely and keeping the wattage to 50w the draw was very loose with fair flavour a good warmth and the vapour production was amazing, so cloudy!
Higher wattages
80/90/100w – As I pumped up the wattage the vapour production increased with fair flavour the heat of the vape in turn increased; by the time I reached 100w my poor old micro lungs were suffering lol. The tank body does get hot at higher wattage which I expected.
My ideal wattage for this tank with 0.15Ω coils is 65/75w.
Flavour Production
While the flavour at lower and medium wattage is good, at higher watts I’d say it’s fair, although I wouldn’t call the overall flavour stellar I have had better from other RTA’s.
Other Comments
The clamp structure is stable but as I said earlier has a wee bit of movement to it, whether this is by design or not it feels to me like one heavy handed push would break the structure.
The airflow (AF) ring is tight to turn while on the mod and quite stiff overall, however, I solved by smearing a little e-liquid on the O ring under the AF ring.
I have been using the Kaees Sacked RTA for almost 2 weeks as I write this review, the only leak I have had from the tank in this time was due to my forgetting to close off the bottom AF before filling!
I do suggest using plenty of cotton in the wick holes but don’t over stuff them!
There is no mention of what material the 2 coils they send out with this kit so I have not used them as I suspect they are Ni80.
Pros
- Good vapour production
- Fair flavour
- Fair design
- Good quality
- Very easy to build on
Cons
- Included coil material
- Flavour could be better
- Care with the clamp structure
- Very stiff AF ring
Final Review Verdict
I can see where Tony B and Kaees were headed with the Stacked RTA and give them credit for trying a slightly different take on an established design. Velocity decks have always been my favourite deck to build upon they are so kind to my arthritic hands LOL, hence the reason I’d give a thumbs up for this RTA to those who want to try building for the first time.
Would I buy the Kaees Stacked RTA again due to loss or damage? Yes.
