ONEWING GROUP LIMITED › RELX HERC 12000 › RELX HERC vs Uwell VanseBar 12000: Flavour Engineering Compared (2026)

RELX HERC vs Uwell VanseBar 12000: Flavour Engineering Compared

By ONEWING GROUP LIMITED · Updated 2026 · Reading time: 7 min

This is the most technically interesting comparison in the 12,000-puff class, because both devices are built by companies whose engineering reputations rest on coils. Uwell’s pitch is a dual mesh (Double Core) system tuned for a smoother, cooler draw. RELX HERC’s pitch is consistency: auto-tuned power that holds flavour and density steady from first puff to last. Both claims are about flavour — they just solve for different failure modes.

Dual mesh versus steady output

A dual mesh coil splits the heating workload across two elements. The practical benefits are well documented: faster ramp-up, more evenly loaded wicking surface, lower heat stress per element, and a cooler vape temperature at a given power level. Uwell has been building coils for years and the VanseBar shows it.

The HERC approaches the same goal from the power side. Instead of asking the coil to compensate for a battery that sags as it drains, the device holds output steady across the life of the reservoir. Mesh handles flavour; power management handles consistency. When flavour fades in a long-life disposable, it is usually the second problem, not the first.

Tank capacity is the tie-breaker

Both devices are rated around 12,000 puffs and both carry 18ml — an unusually close match, which makes this comparison almost a pure engineering read. The VanseBar adds ECO and POWER modes, a LED indicator and a USB-C rechargeable cell. The HERC answers with the charge-free 2,600mAh cell, a smart side display showing battery and liquid level, and an aluminium body.

For a shop, that difference is a merchandising story you can actually tell: one device asks the customer to manage it, the other does not.

What the trade should take away

Two devices built to a similar spec sheet can produce very different return rates. In our experience the variables that drive returns are not puff count, they are: does the customer know when it is finished, and does it need a cable to get there. A visible liquid indicator plus a charge-free cell removes both failure modes at once.

Specification Comparison

Frequently Asked Questions

Which has better flavour, HERC or VanseBar?

They optimise differently. The VanseBar’s dual mesh targets a cooler, smoother draw with strong flavour saturation from the first puff. The HERC targets flavour that does not fade — auto-tuned output keeps density and taste steady across the whole 18ml. If your customers complain about "the tail end tasting weak", the power-management answer usually helps more.

Are both 18ml?

Yes — both are published at 18ml, which makes them unusually direct competitors and an easy side-by-side demonstration on the counter.

Is dual mesh worth paying more for?

It depends on the price gap and your customer base. Dual mesh is a genuine engineering advantage, but so is eliminating charging entirely. Ask which complaint you hear more often at the till, then buy the device that removes it.