Flum UT stands for "Ultimate Taste" — and it is the performance-focused half of the Flum brand. While the Mello series leans into lifestyle aesthetics and themed editions, the UT line is built around one question: how do we make the flavor hit harder and last longer? The answer is dual mesh coils, adjustable turbo/smooth modes, and the industry's first dual-flavor switching system — two independent e-liquid tanks in a single device.
The UT line includes two devices: the UT Bar Pro 25K (19 single flavors, Galaxy LED screen) and the UT Bar Pro 50K (40 flavors including 25 dual-flavor combos, HD screen, dual independent tanks). The 50K's flavor-switching feature has no equivalent from RAZ, Geek Bar, or any other brand we carry at VapesOnlineShop.
What Is Flum UT — The Performance Half of Flum
"UT" stands for Ultimate Taste, and the product line backs up the name. Both UT devices feature dual mesh coils for warmer, denser vapor production, adjustable power modes (Turbo for intensity, Smooth/Eco for longevity), and LED/HD screens that track battery and e-liquid in real time.
The UT series targets vapers who prioritize flavor intensity and hardware features over themed aesthetics. Think of it this way: if Mello is the creative one, UT is the engineer.
UT Bar Pro 50K — The Only Dual-Flavor Disposable on the Market
Why It Matters
The UT Bar Pro 50K is not just another 50,000-puff vape — it is architecturally different. Two independent e-liquid tanks, two coils, one device. You can vape Flavor A alone, Flavor B alone, or activate Mix Mode to fire both coils and blend the flavors in real time. The HD screen shows which tank is active and tracks each tank's e-liquid level independently.
With 25 dual-flavor combos and 15 single-flavor options (40 total), it has the largest selection of any Flum device. Combos like Blue Razz / Lemonade, Cola Ice / Cherry (cherry Coke in Mix Mode), and Root Soda / Vanilla (root beer float in Mix Mode) are exclusive to this device and do not exist in any competing brand's lineup.
Quick Specs
- Puff Count: 50,000 (combined both tanks)
- Tanks: Dual Independent E-Liquid Tanks
- Nicotine: 5% (50 mg)
- Battery: Rechargeable (USB-C)
- Coil: Dual Mesh Coil
- Screen: HD Smart Display
- Modes: Flavor A / Flavor B / Mix
- Flavors: 40 (25 dual + 15 single)
- VOS Price: $24.99
How the Dual-Flavor Switching System Works
This is the feature that separates the UT Bar Pro 50K from every other disposable vape on the market. Here is the technical breakdown:
Only Tank A fires. Pure, distinct taste from one flavor. Preserves Tank B for later.
Only Tank B fires. Switch when you want a change without carrying a second device.
Both coils fire simultaneously, blending A and B into a new combined flavor. Uses e-liquid faster.
Important note: The 50,000-puff count is the combined capacity of both tanks. Using Mix Mode consumes e-liquid from both tanks simultaneously, so the total effective puff count decreases in that mode. The screen monitors each tank independently — if one side runs out, you can continue vaping the other until it too is empty.
Best Mix Mode combinations according to our sales data: Cola Ice / Cherry (creates cherry Coke), Root Soda / Vanilla (root beer float), Blue Razz / Lemonade (berry lemonade), and Banana Smoothy / Strawberry (strawberry banana smoothie).
UT Bar Pro 25K — The Single-Flavor Daily Driver
Why Choose the 25K
Not everyone needs dual tanks. If you know your go-to flavor and want maximum consistency over a long lifespan, the UT Bar Pro 25K delivers 25,000 puffs from a single 15.5ml tank with dual mesh coils. The Galaxy LED screen adds cosmic aesthetics while tracking battery and e-liquid, and the Smooth/Turbo toggle lets you control vapor intensity.
The 19-flavor lineup is focused and proven — no experimental or niche options, just well-tuned profiles that hold up over 25K puffs without fatigue. Blue Razz Icy, Strawmelon Peach, and Cool Mint are the top sellers.
Quick Specs
- Puff Count: 25,000
- E-Liquid: 15.5 ml (single tank)
- Nicotine: 5% (50 mg)
- Battery: 650 mAh (USB-C)
- Coil: Dual Mesh Coil
- Screen: Galaxy LED Display
- Modes: Smooth / Turbo
- Flavors: 19
- VOS Price: $23.99
UT Bar Pro 50K vs 25K — Head-to-Head
| Spec | UT Bar Pro 50K | UT Bar Pro 25K |
|---|---|---|
| Puffs | 50,000 | 25,000 |
| Tank System | Dual Independent Tanks | Single Tank (15.5 ml) |
| Flavor Switch | ✅ A / B / Mix | — |
| Coil | Dual Mesh | Dual Mesh |
| Screen | HD Smart Display | Galaxy LED |
| Modes | Flavor A / B / Mix | Smooth / Turbo |
| Flavor Count | 40 | 19 |
| VOS Price | $24.99 | $23.99 |
| Cost per 1K Puffs | $0.50 | $0.96 |
| Best For | Dual-flavor lovers, Mix Mode fans | Single-flavor loyalty, compact size |
For just $1 more, the 50K doubles the puff count and adds the dual-flavor system. The 25K's advantage is a slightly more compact form factor and the Smooth/Turbo toggle (the 50K's modes are flavor-switching, not power-based). If you always vape the same flavor, the 25K is plenty. If you like having options, the 50K is the better value.
Full flavor lists for both: Flum Vape Flavors — Complete Guide. For in-depth hardware review: UT Bar Pro 50K Review.
UT vs Mello — Which Flum Line Is Right for You
Same manufacturer, same quality standard, completely different priorities. For the detailed comparison with pros/cons, see the Mello vs UT section on our Flum brand guide. Here is the quick version:
UT Is for You If...
- You want dual-flavor switching — two tastes, one device
- You prioritize flavor intensity and performance features
- You like having 40 flavor options on the 50K
- You prefer a bar-shaped form factor
- You want to try Mix Mode — blend two flavors simultaneously
Choose Mello Instead If...
- You love themed editions (City Series, Floral, Valentine)
- You want the animated HD screen
- You prefer a pebble-shaped, ergonomic grip
- You enjoy floral or dessert flavors (Mello exclusives)
- You are upgrading from the Flum Pebble
How UT Compares to RAZ & Geek Bar
| Feature | UT Bar Pro 50K | RAZ VUE 50K | Geek Bar Skyview 25K |
|---|---|---|---|
| Max Puffs | 50,000 | 50,000 | 25,000 |
| Dual Flavor Switch | ✅ Only device in market | — | — |
| Mix Mode | ✅ Blend two flavors | — | — |
| Flavor Options | 40 | 50+ | 25+ |
| Screen | HD | 3D Smart Display | 3D Smart Screen |
| VOS Price | $24.99 | ~$27-29 | ~$25-27 |
| Best For | Variety + switching | Maximum single-device flavors | AI tuning, tech features |
The UT Bar Pro 50K's killer advantage is simple: it is the only disposable vape that lets you carry two different flavors in one device and switch between them. RAZ has more per-device flavor options (50+ vs 40), Geek Bar has fancier screen tech (3D vs HD), but neither can match the dual-tank switching. If you frequently switch flavors throughout the day — or just hate committing to one — the UT 50K eliminates that problem entirely. For a full brand comparison, see Flum vs RAZ Vape.
Frequently Asked Questions
What does "UT" stand for in Flum UT?
UT stands for "Ultimate Taste." It is Flum's performance-oriented product line, distinguished by dual mesh coils, adjustable power modes, and the UT Bar Pro 50K's industry-first dual-flavor switching system.
Can I replace or refill the tanks on the UT Bar Pro 50K?
No. Despite having two independent tanks, the UT Bar Pro 50K is a fully disposable device. The tanks are sealed at the factory and cannot be refilled or replaced. Once both tanks are depleted, the device should be recycled responsibly.
What happens if one tank runs out before the other?
The HD screen tracks each tank independently. If Tank A runs out, you can continue vaping from Tank B until it is also empty. This is especially useful with dual combos where you might prefer one flavor over the other.
Is the UT Bar Pro 50K bigger than the 25K?
Yes. The dual-tank system and larger battery give the 50K a slightly wider profile, but it is designed with an ergonomic grip that remains pocket-friendly. The 25K is more compact if portability is a priority.
Does the UT Bar Pro 25K have dual-flavor switching?
No. The dual-tank flavor switching system is exclusive to the UT Bar Pro 50K. The 25K uses a single tank and instead offers Smooth/Turbo power modes for controlling vapor intensity.