Bonza Pro RTA build guide, deck, wicking and airflow

Opening the box of the Bonza Pro RTA means finding two chambers, a deck with no posts, a stand, spare screws and a manual. What remains is knowing what to put on that deck, under which chamber, how to lay the cotton so it doesn’t get crushed under the chimney, and where to set the airflow ring. Shop listings give the specifications, rarely the order of moves that gets the best from it on the very first build.

The Bonza Pro RTA at a glance, for people who build their own coils

The Bonza Pro RTA is a rebuildable tank atomiser designed by the British reviewer Vaping Bogan and made by ThunderCloud. Its curved postless deck takes a single or a dual coil, each under its own chamber, and air comes down from the top before meeting the coil from three directions.

The left-hand column below gives the data ThunderCloud publishes on the model’s official page and in its technical graphics. The right-hand column says what they change once you are at the bench.

Maker’s data	What it changes at the bench
Curved postless deck, 12 mm wide	Room for two coils side by side, legs trimmed flush
One single-coil chamber, one dual-coil chamber	Chamber chosen to suit the build, before wicking
Top airflow, from three directions	Set with the ring on the top cap, air inlets away from the liquid
Top fill, quarter-turn cap	Filling without stripping down once the cotton is primed
26 mm wide, 30 mm with the bubble glass, 40.5 mm tall	Check the fit on your mod with the bubble glass
4 ml with straight glass, 6 ml with bubble glass	Capacity to compare with the UK rule
810 drip tip, 510 adapter in the box	Your own 510 drip tip can go on

That capacity needs checking before you buy. Under the Tobacco and Related Products Regulations 2016, the tank of a refillable electronic cigarette sold in the UK must not exceed 2 ml, so the version on sale here may differ from the maker’s headline figures. Nicotine e-liquid is capped at 20 mg/ml in bottles of up to 10 ml, and nicotine vaping products are not for sale to under-18s.

The curved postless deck, what it changes about the build

With no posts, the coil legs go into holes drilled through the central block, then a screw clamps them from above. The deck photo published by the maker shows four clamping screws, enough to secure two coils.

ThunderCloud presents this 12 mm platform as wide, designed for bulky coils. For reference, a coil of six contact wraps in 0.40 mm wire is 2.4 mm wide, and 4.4 mm with spaced wraps. Two coils of that kind leave room to centre each one over its own airflow.

The Bonza Pro RTA box also includes a stand with a 510 connection, which the deck screws onto so it stays steady while you work. Once the screws are tight, trim the legs flush. With a chamber sitting over the deck, the smallest stub of wire left proud risks touching metal and causing a short.

Which build to put on the Bonza Pro RTA

The maker doesn’t publish a reference build on its page. The two set-ups below are the workshop’s starting points, worked out on our reference wire, 0.40 mm kanthal A1.

Single coil, with the single chamber

Six wraps on a 3 mm rod give 0.74 Ω, legs aside. Seat the coil in the middle of the deck, with the legs in the holes the manual marks for single-coil use, then fit the single chamber, which tightens the space around one coil. It is the easiest set-up to tune, and usually the lighter on liquid.

Dual coil, with the dual chamber

Two identical 0.74 Ω coils in parallel drop to 0.37 Ω. The word identical matters. Same wire, same rod, same number of wraps and same leg length, otherwise the shorter coil takes a bigger share of the power and heats faster than its neighbour.

Check each coil with the ohm reader before fitting the second, then check the pair. A stable reading close to 0.37 Ω confirms the two coils are working together.

The coils supplied in the box

ThunderCloud puts pre-made coils in the packaging, without stating their value on its page. Measure them before fitting, and check the pair against the range your mod and batteries accept before the first draw.

Wicking this deck without crushing the cotton under the chamber

Cotton in the Bonza Pro RTA follows the rules of any tank, with one extra constraint, the chamber that sits down over the deck. Cut a wick about twice the coil’s inner diameter wide, the usual rule, so 6 mm for a 3 mm rod, and pull it through with light resistance.

Then trim the tails so they cover the deck’s juice ports without blocking or packing them. Fluff them up with tweezers. Now fit the chamber dry to check it seats fully without pinching the wick. If it catches, shorten the tails slightly rather than forcing it.

On a dual build, each wick feeds its own coil. Give all four tails the same length and density, so both coils drink at the same rate. The settings for each type of atomiser are covered in our guide on how to wick a coil for your atomiser.

Prime the cotton drop by drop, take another ohm reading, since the wick may have pushed the wraps, then fill from the top by turning the cap a quarter turn.

Tuning the airflow on the Bonza Pro RTA

Air enters at the top of the cap, where a ring opens up more or fewer holes. According to the maker’s diagram, it then travels down the body and reaches the coil area from three directions, down to deck level.

That top-down path keeps the air inlets away from the liquid sitting on the deck, which cuts the chances of leaking through them. It is no excuse for careless wicking, though.

To tune it, start with the ring half open, take a few draws, then open or close it one step at a time. The single and dual chambers don’t leave the same space around the coil, so the same ring setting won’t give the same draw from one set-up to the other. On a dual build, make sure both coils sit at the same height and the same distance from the walls, so each one gets the same airflow.

FAQ

Five practical questions about this model, adding to the steps described above.

Who designed the Bonza Pro RTA?

The model is designed by Vaping Bogan, a British reviewer, and produced by ThunderCloud, a brand specialising in rebuildable gear whose official website gives an address in South El Monte, in the United States.

Can you fit your own drip tip?

Yes. The atomiser comes with 810 drip tips, and the box includes a 510 adapter so you can fit a personal drip tip in that size.

What warranty does the maker offer?

ThunderCloud advertises a lifetime warranty on this model, and a warranty card comes in the box. The exact terms are set out on the maker’s website.

Does this deck need a particular wire?

No. The maker describes its deck as suited to large coils and advanced builds, within its 12 mm width. The wire is chosen for the target resistance, and the final value is always checked with an ohm reader.

Is the Bonza Pro RTA a good first rebuildable?

It stays approachable if you start with a single coil, the single chamber, one wick and one airflow setting to find. The dual build can come later, once the habit of taking readings is second nature.

The Bonza Pro RTA, a deck that rewards method

The Bonza Pro RTA doesn’t ask for any exotic technique. It asks for order. A coil seated in the middle and measured, a wick trimmed so it doesn’t get in the chamber’s way, an airflow ring set one step at a time, and the deck delivers what it was designed for.

It is the same logic as for any tank atomiser, applied to a deck that leaves plenty of room. That freedom is easier to manage with figures to go on than by guesswork.

Also on the bench

Build notes from L’Atelier Brouillard, for adult readers only. Vaping products usually contain nicotine, which is addictive, and nicotine vaping products are not for sale to under-18s in the UK. Nothing here is a recommendation to buy.