Do Longfills Work with Every Vape Kit?
Do longfills
work with every
vape kit?
The honest answer is no. Longfills work with most modern refillable kits but the ratio has to match. This is the UK compatibility guide covering pod kits, MTL devices, sub-ohm mods plus the kits you should never try to use a longfill with.
No but yes for most modern kits. A longfill works with any refillable vape kit as long as the VG/PG ratio of the Mixer Kit matches the device. Pick 50/50 longfills for pod kits plus MTL devices. Pick 70/30 longfills for sub-ohm mods. The only kits that genuinely do not work with longfills are disposable vapes because they cannot be refilled by design. Always match the Mixer Kit ratio to your device before mixing anything.
Three numbers
that decide kit compatibility
Coil resistance, VG/PG ratio plus whether the device is refillable. Get all three right plus any longfill works.
Kit categories
Refillable works. Disposable never works. This is the first yes/no question to ask.
Resistance threshold
Below 0.4 ohm means sub-ohm territory so pick 70/30. Above 0.4 ohm means pick 50/50.
Compatible kits
Almost every modern UK refillable kit works with longfills in the correct ratio. The exceptions are few.
Longfills are compatible with any refillable kit. The ratio decides whether it works well.
A longfill is just a 60ml refillable e-liquid bottle. Once mixed with a Mixer Kit it becomes standard vape juice at a known strength plus VG/PG ratio. That means any device that can be refilled with e-liquid is technically compatible with a longfill. The practical question is whether the ratio suits the device. Get the ratio wrong plus the liquid vapes badly even though it would be fine in a different kit.
UK vape kits fall into three main families. Pod kits are small devices with pre-built coil pods designed for a tight mouth-to-lung inhale. They use low-power coils around 0.8 to 1.2 ohms plus run at roughly 10 to 15 watts. MTL devices are slightly bigger kits with refillable tanks plus replaceable coils, still running at moderate wattage for cigarette-style draws. Sub-ohm mods are high-power devices with large tanks, sub-ohm coils below 0.4 ohms plus wattages from 30 watts upwards for cloud production.
Each family needs a different liquid consistency. Pod kits need thin 50/50 liquid so the small cotton wicks can keep up. MTL devices also prefer 50/50 for the same reason. Sub-ohm mods need thick 70/30 liquid so the big wicks do not flood. This is the entire compatibility puzzle. Pick the right ratio Mixer Kit for the right device plus the longfill works identically to any shop-bought e-liquid.
What about disposables, rebuildables plus vintage kits?
Disposables are sealed-unit vapes designed to be thrown away once empty. You cannot open them to add liquid so they are not compatible with any longfill under any circumstances. Rebuildable atomisers at the other end of the spectrum are fully compatible because the user sets the coil resistance plus wicking themselves. Vintage kits from before 2017 sometimes predate modern coil standards plus can behave unpredictably. For anything older than eight years we recommend checking with the manufacturer or upgrading to a current UK TPD-compliant kit.
- Modern pod kit. Use 50/50 Freebase or Nic Salt Mixer Kit.
- MTL refillable device. Use 50/50 Freebase Mixer Kit.
- Sub-ohm box mod. Use 70/30 Freebase Mixer Kit.
- Disposable vape. Not compatible. Cannot be refilled by design.
Every major
UK kit category
Eight device categories mapped against the two main longfill ratios. Green works. Amber works with caveats. Red do not try.
Match a green to a green plus mix confidently
For each device category, pick the ratio column that is green. If both show red the format is incompatible entirely.
Three principles that
decide every pairing
Follow these three rules plus compatibility is no longer a question to worry about.
Refillable only
The device must have a refill port or removable tank. If it is sealed from the factory plus meant for single use, no longfill will work. This rule eliminates all disposables.
Match the ratio to the coil
Below 0.4 ohm means sub-ohm so pick 70/30. Above 0.4 ohm means MTL or pod so pick 50/50. The coil is on the side of the box or printed on the coil itself.
Match the strength to the kit
Pod plus MTL users typically pick 9mg freebase or 10mg nic salt. Sub-ohm users pick 3mg or 6mg freebase. Too strong for a sub-ohm device delivers an unpleasant hit.
When in doubt, check the coil box
Most coil packs print the recommended e-liquid ratio on the side. If the coil recommends 70 percent VG or higher, buy a 70/30 Mixer Kit. If it says 50/50 friendly, buy the 50/50 kit.
Match your device
to the right Nixer kit
Every Nixer longfill pairs with both 50/50 plus 70/30 Mixer Kits. Pick the ratio that matches your device then pick your strength from the dropdown next to the buy button. No compatibility guesswork required.
Browse the full Nixer longfill collection where every flavour lists its compatible Mixer Kit ratios on the product page. Filter by 50/50 or 70/30 depending on whether you run a pod kit, MTL device or a sub-ohm mod.
What longfills
work with vs what they do not
Longfills work with these kits
- ✓Refillable pod kits with 50/50 Mixer Kits. The default pairing for ex-smokers.
- ✓MTL refillable devices with 50/50 Freebase Mixer Kits at 6mg or 9mg.
- ✓Sub-ohm box mods with 70/30 Freebase Mixer Kits at 3mg or 6mg.
- ✓Rebuildable RDAs and RTAs with matched ratio based on build resistance.
- ✓Open-system prefilled pod kits with 50/50 kits only due to wick size.
Kits to avoid entirely
- ✗Disposable vapes of any brand. Sealed units, never designed to be refilled.
- ✗Cartridge-only pod kits that require proprietary sealed pods, not refillable ones.
- ✗Pre-2017 vintage kits that may not meet current coil or wicking standards.
- ✗Medical nebulisers. These are not vape devices despite physical similarities.
- ✗Any device above 80W with a stock coil that does not list longfill support.
For the wider picture on longfill compatibility including specific Mixer Kit strengths plus mixing methods, head to our complete Nixer vape review hub where each practical question has its own UK-focused article covering real-world pairings.
Back to the Nixer Vape Review hub
This article is one chapter inside our complete Nixer knowledge base. Head back for the full index covering longfill basics, mixing, strength selection, ratios plus every Mixer Kit variant.
More on devices
& compatibility
For the Nixer-specific device recommendations rather than the general longfill compatibility covered above, see our guide on what devices work best with Nixer longfills. Once you know the device, our full walkthrough on how to choose the right VG/PG ratio for longfills goes deeper into why the ratio matters plus what each one feels like to vape. Plus if you are specifically a sub-ohm vaper wondering whether longfills are the right format for cloud chasing, are longfills better for sub-ohm vaping covers the full case.