Zeus by Geekvape | bench protocol for the Z sub-ohm tank

One 0.4 Ω coil, one manufacturer, and two wattage ranges published on two pages of its own online store. The Zeus by Geekvape has gathered gaps of this kind ever since its name started to cover several successive tanks, from the first Z Sub-Ohm to the Z Sub-Ohm Tank 5. For a test bench, the hard part is not the measurement itself. It is knowing which Zeus sits on the bench, and which figure to hold it against.

Zeus by Geekvape, what the grid measures on a Z tank

The Zeus by Geekvape is a line of sub-ohm tanks using prebuilt Z series coils, designed for direct lung vaping and fitted with top airflow. On these tanks, the bench measures five quantities, namely the real resistance of each coil head, the voltage delivered at the chosen wattage, the mass of liquid lost after a rest period, the effective capacity, and finally the dimensions and weight. The claimed leak resistance and the stated coil lifespan remain declarations, recorded but not scored.

Geekvape’s official store pages describe three versions with different values, which the grid takes as its starting point. In the UK, refillable tanks are capped at 2 ml, so the larger figures describe versions sold elsewhere.

Version	Stated size	Capacity	Coils supplied
Z Sub-Ohm	26 × 42.5 mm, excluding drip tip	5 ml, 3.5 ml spare glass, 2 ml TPD	Z2 0.2 Ω (70 to 80 W) fitted, Z1 0.4 Ω (60 to 70 W)
Z Sub-Ohm SE	29 × 51.9 mm	5.5 ml, 2 ml TPD	Z 0.15 Ω XM (70 to 85 W) fitted, Z 0.4 Ω (50 to 60 W)
Z Sub-Ohm Tank 5	29 × 56.1 mm	5.5 ml or 7 ml, 2 ml	Z 0.2 Ω XM (70 to 80 W) fitted, Z 0.4 Ω XM (50 to 60 W)

Zeus becomes Z, several versions under one name

On its own product pages, Geekvape writes “Z(Zeus) Sub-ohm tank”, with the original name relegated to brackets behind the letter Z. The page for the first model also warns that old and new versions of the tank are shipped at random.

Two units bought under the same name can therefore differ, and two sets of readings only compare if the exact version is recorded. The grid photographs the tank stripped down, notes the markings on the base and keeps the packaging of the original coil, which states its value and range.

Kits muddy the picture further. The Legend 5 run on the same grid is offered by the brand with either the Z Sub-Ohm 2021 or the Z Sub-Ohm Tank 5, two different tanks on an identical box mod.

The Z 0.4 Ω coil, two ranges from the same manufacturer

Geekvape’s official coil page lists six values or variants, and one of them changes range depending on the page consulted. Before comparing coil heads with one another, the grid settles that point, then turns each range into voltage and current.

One coil rated 60 to 70 W, then 50 to 60 W

The Z Sub-Ohm product page supplies a Mesh Z1 0.4 Ω coil rated at 60 to 70 W. On the Z coil page, the same value is rated 50 to 60 W, and that range is the one shown on the SE and Tank 5 pages for the spare coil.

The gap amounts to 10 W at the top of the range, meaning a voltage that rises from 4.90 V to 5.29 V and a current that rises from 12.25 A to 13.23 A through the coil. Neither range is therefore taken as the default. The bench reads the value printed on the packaging, measures the coil cold, then steps up in 5 W increments from 50 W while recording the voltage under load.

Voltage and current, coil by coil

As with the Geekvape Soul 2 and its pods, voltage and current follow from power and resistance (V = √(P × R) and I = √(P / R)). The top of each official range thus translates into values that can be checked.

Coil	Official range	Voltage at the top	Current at the top
Z 0.15 Ω	80 to 90 W	3.67 V	24.49 A
Z 0.15 Ω XM	70 to 85 W	3.57 V	23.80 A
Z 0.15 Ω SS316L	60 to 70 W	3.24 V	21.60 A
Z 0.2 Ω	70 to 80 W	4.00 V	20.00 A
Z 0.25 Ω Dual	45 to 57 W	3.77 V	15.10 A
Z 0.4 Ω	50 to 60 W	4.90 V	12.25 A

These currents flow through the coil, not the batteries, whose load depends on how the cells are arranged and how charged they are, a calculation covered in our check of the Vaporesso Gen Max’s 220 W.

Top airflow and leaks, the rest-period protocol

Geekvape makes top airflow the leak-control argument of the whole line, with wording that has shifted over time. The original Z Sub-Ohm claims a “leak-proof” function, the SE a “Leakproof Top Airflow System”, and the Tank 5 now speaks of a “Leak-Resistant” top airflow placed “for Minimum Leaking Risk”.

Leak resistance cannot be scored on trust. The protocol weighs the filled tank to a hundredth of a gram, leaves it upright for twelve hours and then on its side for one hour, wipes it and weighs it again. The mass lost, set against the liquid poured in, can be compared from one tank to the next.

That figure only holds under fixed conditions, with the same 30/70 liquid for every run, a constant room temperature and the base tightened the same way each time.

Zeus tank capacity, 5.5 ml claimed and the 2 ml UK cap

Standard versions of the Zeus by Geekvape hold 5 ml for the first Z Sub-Ohm and 5.5 ml for both the SE and the Tank 5, with an optional 7 ml glass for the latter. Refillable tanks sold in the UK are capped at 2 ml, and each of the three official pages lists a 2 ml version, labelled TPD on the first two.

To measure the real capacity of the version received, the tank is filled with demineralised water and weighed, one gram matching roughly one millilitre at room temperature. Each run also records the glass fitted, since it sets the volume, and Geekvape states on its spare bubble glass page that this glass changes capacity by about 0.5 ml.

Nicotine e-liquid in the UK is capped at 20 mg/ml and sold in 10 ml bottles, a limit with no bearing on the bench readings.

Zeus dimensions and weight, what the sources publish

The manufacturer gives 26 × 42.5 mm excluding the drip tip for the Z Sub-Ohm, without saying which figure is the diameter, and publishes no weight. One French retailer lists 26 mm across, 42.5 mm tall and 65.8 g, while another shows 25 mm across for the same height. A review published by a third retailer records 26 mm at the base, 29 mm at the widest point with the bubble glass, 56 mm in height and 68 g.

These figures need not contradict each other if they describe the base or the glass, with or without the drip tip. The grid therefore fixes the measuring points, namely the base diameter, the glass at its widest, the height with and without the drip tip, and the empty weight. It is the glass that decides any overhang on a 26 mm box mod.

Coil lifespan, the 60 ml claim

The SE and Tank 5 pages claim a coil life of up to 60 ml, and Geekvape credits the Boost version of its XM heads with a lifespan about 100% longer than the previous generation. Set against the tank, 60 ml equals 30 fills of a 2 ml UK tank.

The figure is recorded without being scored, because the life of a coil head depends on the liquid, the wattage set and each person’s pace. The grid only reads the cold resistance before and after a fixed series of activations, to flag any drift.

Scoring grid for the Zeus and protocol limits

Weightings are fixed before the bench run, so that the three versions of the Zeus by Geekvape stay comparable with one another and with other tanks.

Criterion	Weight	Status
Delivered voltage against displayed wattage, per coil	25%	Measurable
Mass lost after upright and side rests	20%	Measurable
Real resistance of Z coils and gap to marking	15%	Measurable
Effective capacity of the version received	15%	Measurable
Dimensions, weight and overhang on a 26 mm box	10%	Measurable
Top filling and airflow adjustment	10%	Observable
Stated coil lifespan	5%	Declared

Each version runs with new coil heads, on the same box mod from one tank to the next.

FAQ

These usage questions fall outside the protocol, but they come up as soon as a Zeus reaches the bench.

Which coil fits a Zeus tank?

A Z series coil head. Geekvape lists it for the Z Fli, Z Fli 2, Z Subohm Tank, its 2021 version, the SE and the Tank 5, as well as for the Aegis Legend 2, 3 and 5, Aegis Max 2 and Aegis Solo 3 kits. The official table still links each value to specific models, the 0.25 Ω for instance not being intended for the P Subohm Tank.

How do you change the coil on a Zeus?

From underneath. Z coils push into the base of the tank, which therefore has to be emptied, turned over and unscrewed below the glass. Once the old head is out and the new one pushed firmly home, a few drops of liquid on the visible cotton and a few minutes of waiting after filling avoid heating a dry wick.

Is the Zeus a tank or a rebuildable atomiser?

Both exist under that name. A sub-ohm tank takes a prebuilt coil that is replaced whole, which is the case for the Z Sub-Ohm models. Rebuildable atomisers such as the Z Dual RTA, the ZX RTA and the ZX II RTA take a home-made build on a deck, and Geekvape places them in the same family since they share the Z replacement glass.

What type of coil does the Zeus use?

A mesh coil. Geekvape describes heads with a kanthal mesh, marked KA1 on the first Z Sub-Ohm page, alongside a 0.15 Ω variant in SS316L stainless steel. The Boost version of the XM heads keeps the same principle with reworked cotton, according to the manufacturer.

Will a Zeus run on a 40 W device?

Not within the intended ranges. No head in the Z series is rated below 45 W in the manufacturer’s table, the lowest being the 0.25 Ω Dual at 45 to 57 W. A device capped at 40 W therefore sits below every official range, and the bench never tests a coil outside its range.

What the bench keeps from the Zeus by Geekvape

On the Zeus, the grid separates what the manufacturer publishes consistently, such as the 70 to 80 W of the 0.2 Ω head, from what it publishes two ways, such as the 0.4 Ω head. It then measures what nobody publishes, the mass lost after a rest and the capacity of the glass actually fitted.

The exact version, the glass fitted and the original coil are recorded before any comparison, and that record is what makes a Zeus by Geekvape comparable with the other tanks run on this bench.

Editorial content for adult readers only. Vaping products can contain nicotine, which is a highly addictive substance. Vaping products are not for sale to anyone under 18 in the UK. This article is not a buying recommendation.