Flum currently sells four distinct devices: the Mello 20K, Float Mello Pro 50K, UT Bar Pro 50K, and UT Bar Pro 25K. Each one has a different screen, different controls, and different features. The Mello keeps it simple. The UT Bar Pro 50K gives you dual-tank flavor mixing. Knowing how to use your specific model matters — it determines whether you get 25,000 or 50,000 puffs from the same device.
| Model | Puffs | Key Feature | Price |
|---|---|---|---|
| Flum Mello 20K | 20,000 | Mega HD Animated Screen | $23.99 |
| Float Mello Pro 50K | 50,000 | Eco/Turbo Mode Toggle | $24.99 |
| UT Bar Pro 50K | 50,000 | Dual Flavor Switching | $24.99 |
| UT Bar Pro 25K | 25,000 | Galaxy LED + Cosmos Animations | $23.99 |
Getting Started: First-Time Setup for Any Flum Vape
Every Flum device ships ready to use. No filling, no coil priming, no assembly. Here are the steps for any model:
- Unbox and remove protective covers. Pull off the silicone mouthpiece cap and peel any sticker covering the bottom charging port or airflow slot.
- Take a slow, steady draw. All current Flum vapes are draw-activated. No power button. No startup sequence. The screen turns on the moment you inhale.
- Read the screen. Battery level and e-liquid level appear right away. Newer models also display your puff count and active mode.
- Charge before first use (recommended). Flum devices ship partially charged. Plugging into USB-C for 30–45 minutes before your first session gives you the full battery experience.
For a deeper look at charging times, battery indicators, and troubleshooting tips for every Flum model, check out our full Flum charging guide.
How to Use Flum Mello 20K
The Mello 20K is Flum's straightforward entry point. One mode, one coil, one mission: consistent flavor for 20,000 puffs. No toggles, no switching. Just draw and go.
Screen Readouts
The Mega HD Animated Screen displays three things at all times:
- Battery Level — percentage bar on the left side
- E-Liquid Level — percentage bar on the right side
- Puff Counter — running total of draws taken, displayed center
The screen also runs animated backgrounds between puffs. These are cosmetic — they don't indicate any device status.
The Coil System
The Mello 20K uses Flum's Hybrid 2.0 Mesh Coil — a single mesh heating element at fixed wattage. It heats evenly across the entire surface, which eliminates the hot spots that cause flavor degradation in cheaper devices. You get the same flavor quality at puff 1 and puff 20,000.
Quick Specs
| Spec | Detail |
|---|---|
| Puff Count | 20,000 |
| Battery | 650mAh rechargeable (USB-C) |
| E-Liquid | 15ml pre-filled |
| Nicotine | 5% (50mg/ml) |
| Coil | Hybrid 2.0 Mesh |
| Flavors | 13 options |
The flavor lineup includes Strawberry Blast, Blue Razz Icy, Miami Mint, Watermelon Icy, and 9 more. Browse all 13 on the Flum Mello Flavors page.
When to Charge
Plug in when the battery bar drops below 15–20%. A full charge takes roughly 45 minutes via USB-C. The device has built-in overcharge protection — it stops drawing power at 100%, so leaving it plugged in overnight is fine.
How to Use Flum Float Mello Pro 50K: Eco Mode vs Turbo Mode
The Float Mello Pro 50K is Flum's high-capacity single-flavor device. It holds 50,000 puffs — but only if you understand how its two power modes work. Use the wrong mode full-time and you'll burn through e-liquid twice as fast.
Finding the Mode Button
There's a dedicated button on the side of the device, near the base. One press toggles between Eco and Turbo. The Smart HD Color Display confirms which mode is active immediately.
Eco Mode (Default)
- Fires a single mesh coil at approximately 25W
- Cooler, smoother vapor production
- Maximum e-liquid efficiency — you hit the full 50,000 puff rating
- Best for all-day use, casual sessions, and flavor clarity
Turbo Mode
- Fires both dual mesh coils simultaneously
- Noticeably warmer, denser vapor clouds
- Flavor intensity spikes — especially on fruity and icy profiles
- Puff count drops to roughly 25,000 due to higher e-liquid consumption per draw
Which Mode Should You Use?
Most people settle into Eco for daily use and flip to Turbo when they want a stronger hit — after meals, during breaks, or when the moment calls for bigger clouds. The battery draw is similar in both modes. The real difference is e-liquid consumption: Turbo uses about twice as much juice per puff.
For a hands-on performance breakdown, read the full Flum Float Mello Pro 50K Review.
How to Use Flum UT Bar Pro 50K: Dual Flavor Switching
The UT Bar Pro 50K is Flum's most feature-packed device. Two separate e-liquid tanks in one body. Switch between flavors instantly, or activate Mix Mode and blend both tanks together. No other disposable does this.
Understanding the Controls
The UT Bar Pro 50K has more inputs than any other Flum device:
- Flavor Toggle Switch — located on the side, cycles between Tank A, Tank B, and Mix Mode
- Two Flavor Intensity Buttons — on top of the device, one per tank. Press to adjust how strongly each flavor comes through
- Airflow Dial — twist ring at the base. Clockwise = tighter draw, counterclockwise = more open airflow
- Mode Button — toggles Eco/Turbo just like the Float Mello Pro
How to Switch Flavors
- Locate the toggle switch on the device body
- Click once → Tank A active (screen shows Tank A flavor name and level)
- Click again → Tank B active
- Click once more → Mix Mode (both tanks fire together, blending the two flavors)
The Mega HD Screen displays which tank is active and tracks e-liquid levels for each tank independently.
Mix Mode — The Standout Feature
When both tanks fire simultaneously, you create a custom blend. Popular combinations from the UT flavor lineup include:
- Blue Razz + Lemonade — tart, fizzy balance
- Mango + Strawberry — tropical fruit punch
- Cool Mint + any fruit flavor — extra ice kick on demand
Airflow Adjustment
Twist the ring at the base of the device:
- Tight (clockwise) — concentrated flavor, stronger throat feel, mouth-to-lung style
- Open (counterclockwise) — bigger clouds, smoother draw, closer to direct-lung
Start in the middle position and adjust from there. Most flavor chasers land somewhere between mid and tight.
How to Use Flum UT Bar Pro 25K
The UT Bar Pro 25K is the compact option in the UT lineup. Single tank, but it keeps the smart screen and adjustable power modes that make the UT line worth using.
Key Controls
- Power Mode Toggle — switches between Smooth Mode (25,000 puffs at ~12W) and Turbo Mode (12,000 puffs at ~20W)
- Adjustable Airflow — same twist dial as the UT 50K
- Galaxy LED Screen — shows battery, e-liquid level, puff count, and Cosmos-themed animations between draws
Smooth vs Turbo
Smooth Mode keeps the wattage low for gentle, clean draws. Turbo cranks it up for warmer vapor and stronger throat feel. Same concept as the Float Mello Pro's Eco/Turbo split, just at a slightly lower overall power level.
| Spec | Smooth Mode | Turbo Mode |
|---|---|---|
| Wattage | ~12W | ~20W |
| Puff Count | 25,000 | 12,000 |
| Vapor Temp | Cool | Warm |
| Best For | Flavor, longevity | Cloud, intensity |
The UT Bar Pro 25K ships in 4 flavors: Double Green Pop, Lime Splash, Red Pop, and Strawberry Blast. For more options, check the full Flum UT Flavors collection.
Shop Flum Vape Collection
Flum Vape Screen Display Guide: What Each Icon Means
Every current Flum vape has a screen. Here's how to read the information it shows you.
Battery at 0% but e-liquid left? Charge via USB-C. The device still has juice — it just needs power.
E-liquid at 0% but battery left? The device is finished. Time for a new one. Continuing to draw on an empty tank risks burning the coil and getting a harsh, unpleasant hit.
Battery Life & Puff Count: All Flum Models Compared
| Feature | Mello 20K | Float Mello Pro 50K | UT Bar Pro 50K | UT Bar Pro 25K |
|---|---|---|---|---|
| Puffs (Eco/Smooth) | 20,000 | 50,000 | 50,000 | 25,000 |
| Puffs (Turbo) | — | ~25,000 | ~25,000 | 12,000 |
| Battery | 650mAh | 900mAh | 900mAh | 800mAh |
| E-Liquid | 15ml | 20ml | 20ml (10ml × 2) | 18ml |
| Charging | USB-C | USB-C | USB-C | USB-C |
| Charge Time | ~45 min | ~60 min | ~60 min | ~50 min |
| Price | $23.99 | $24.99 | $24.99 | $23.99 |
Charging Tips
- Use a standard 5V/1A USB-C charger — any phone charger works. Avoid fast chargers (PD/QC). They won't damage the device (overcurrent protection activates), but they don't speed up charging either.
- Charge at 15–20% battery, not at 0%. Topping up before the battery fully drains extends overall lifespan.
- Overcharge protection is built in. The device stops drawing power at 100%. Overnight charging is fine.
- Charging indicator: A solid LED near the port means charging is active. The LED turns off (or the screen shows a full battery icon) when complete.
The U.S. Environmental Protection Agency recommends recycling lithium-ion batteries through certified e-waste programs rather than tossing them in regular trash.
Tips for Getting the Best Flum Vape Experience
- Break it in gently. Your first 20–30 puffs should be slow, 2-second draws. The coil wicks better with gentle initial use — and that means better flavor from puff one.
- Don't chain-vape. Rapid consecutive draws overheat the coil, produce a burnt taste, and cut device life short. Wait 5–10 seconds between puffs.
- Store upright when possible. Keeping the device vertical (mouthpiece up) prevents e-liquid from pooling near the airflow sensor. That pooling causes gurgling and flooding.
- Keep it away from heat. Don't leave your Flum in a hot car, in direct sunlight, or near radiators. High temperatures degrade both the battery and the e-liquid inside.
- Run Eco Mode as your default. Switch to Turbo when you want a hit with more punch. You'll get significantly more sessions per device this way.
- Clean the mouthpiece weekly. A quick wipe with a dry cloth removes condensation buildup that can muffle flavor clarity over time.
The FDA's Center for Tobacco Products provides regulatory information on electronic nicotine delivery systems for adult consumers (21+).
FAQs About Using Flum Vape
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Questions? Contact our support team for help with your Flum device.