Uwell Caliburn GZ2 Pod System Kit Reviews

Introduction

The Uwell Caliburn GZ2 Pod System Kit is a compact refillable pod device in the Caliburn series, built around an 850mAh internal battery, a maximum output of 17W, and a 2ml pod. It is positioned for everyday, portable use rather than high-power cloud chasing. The main selling points on paper are a smaller front surface, a larger battery than earlier Caliburn models, a three-step refill system, and a clear juice window. This review covers the published specifications, design notes, coil options, and the practical role the device can fill based on its spec sheet.

Specifications

The following specifications are taken from the product information supplied for the Caliburn GZ2 kit.

Dimensions: 28.9mm x 22.9mm x 72.5mm
Net weight: 47g
Battery: built-in 850mAh
Maximum output: 17W
E-liquid capacity: 2ml
Charging: Type-C
Airflow: precise airflow control (iAFC)
Coil options: UN2 Meshed 0.8Ω Caliburn G coil (pre-installed) and UN2 Meshed 1.2Ω Caliburn G2 coil (spare)
Device materials: Aluminum Alloy and PC
Cartridge material: PCTG
Form factor: ZEGA, up to 50% smaller front surface area
Refill system: 3-step U-Valve

Design and Build

The GZ2 uses the ZEGA form factor, which is described as reducing the front surface area by up to 50% compared with conventional pod devices. The body measures 28.9mm x 22.9mm x 72.5mm and weighs 47g, so it is meant to be easy to carry and hold. The listed dimensions place it in the compact range of Caliburn pods, while the shape is intended to take up less room in a pocket or bag.

The device body is built from Aluminum Alloy and PC, while the cartridge uses PCTG. Aluminum Alloy gives the shell a stiffer feel, and PC keeps the weight down. The cartridge material is a common choice for e-liquid containers because it is clear and reasonably durable. Based on the materials listed, the device should handle normal daily use without feeling fragile, though the review does not include a drop test or long-term durability data.

The ClearView juice window is located on the cartridge so the user can check e-liquid level without removing the pod. The design is minimal, with controls kept simple: a 3-step U-Valve refill system and iAFC airflow control. No button sequence is needed for basic airflow changes because the iAFC is a mechanical adjustment. The overall layout is straightforward, and the compact body is intended for pocket carry.

Features and Performance

The GZ2 is powered by an 850mAh battery, which is about 20% larger than earlier Caliburn models according to the product material. With a maximum output of 17W, the device is clearly aimed at mouth-to-lung and restricted direct-lung styles rather than high wattage. The battery should cover a moderate day of use for most MTL vapers, but heavier users may need to recharge during the day. No battery runtime measurement is included in the available facts, so this is an estimate based on the capacity and power range.

The kit includes two FeCrAl UN2 Meshed coils: a 0.8Ω Caliburn G coil pre-installed and a 1.2Ω Caliburn G2 coil as a spare. The 0.8Ω coil is the more open option, while the 1.2Ω coil should give a tighter MTL draw. On paper, the lower-resistance coil will use more power, while the higher-resistance coil should be more efficient and closer to a classic MTL feel. The FeCrAl meshed coil type is a common choice in Uwell Caliburn products because it is intended to heat evenly and deliver consistent flavor.

The 3-step U-Valve refill system is designed to reduce mess when filling the pod. The valve system is meant to let the user refill by opening the valve, inserting the bottle tip, and closing it again. The ClearView juice window makes it easier to see when the pod is low. The iAFC airflow control gives the user a way to tune the draw from a tighter to a looser pull, which matters when switching between the two coil resistances.

Because the device has a 2ml e-liquid capacity and a 17W cap, it is not designed for long, high-power sessions. It fits a niche for someone who wants a small pod with coil options and adjustable airflow. The Type-C charging input is a standard convenience, although the charging speed is not specified in the available facts.

For someone coming from a small pod or a simple mouth-to-lung device, the GZ2 offers a familiar shape with an 850mAh battery that is larger than earlier Caliburn models. The iAFC airflow lets the user make small changes to the draw without replacing the coil. The U-Valve system is designed to make refilling easier for people who fill from small bottles. These features are practical for daily use, but they do not change the fundamental low-wattage position of the device.

Advantages and Disadvantages

Advantages

Compact ZEGA form factor reduces the front surface area by up to 50%, making it easier to carry.
850mAh battery is about 20% larger than earlier Caliburn models and should cover a day of moderate use.
Two coil options (0.8Ω and 1.2Ω) let users choose between a slightly more open draw and a tighter MTL draw.
U-Valve 3-step refill and ClearView juice window make filling and checking liquid level straightforward.
Type-C charging is a common convenience on modern pod kits.

Disadvantages

2ml e-liquid capacity may require frequent refills for heavier vapers.
17W maximum output is limited for users who prefer higher-power, direct-lung vaping.
The kit is compact, but the exact charging speed and battery runtime are not stated in the available specs.

Final Verdict

The Caliburn GZ2 is a compact, low-wattage pod kit aimed at portable MTL use. Its 850mAh battery, 2ml pod, and 17W maximum output make it a reasonable option for someone who wants a small device for everyday use. The two coil options give the user some flexibility, and the refill and airflow features are practical for a pocket-sized pod.

Buy If

You want a small Caliburn-style pod kit with a 2ml refillable pod and an 850mAh battery.
You prefer MTL vaping and want coil options at 0.8Ω and 1.2Ω.
You value a clear juice window and a refill system designed to be simple.

Skip If

You need a higher wattage device or a larger e-liquid capacity for long sessions.
You want a device with faster charging than the unspecified Type-C rate on this kit.
You are looking for a direct-lung pod with power above 17W.