What Is Sub Ohm Vaping?
A clear UK guide to sub ohm vaping, the high power style that produces big clouds and the devices that drive it.
Sub ohm means using vape coils with resistance below 1 ohm to produce more vapour at higher power.
Sub ohm coils typically run 0.15 to 0.5 ohms paired with mods at 40 to 200 watts. The combination produces large clouds, intense flavour and uses much more e-liquid than MTL setups. Sub ohm is the equipment side of DTL vaping. Most UK cloud chasers and flavour focused vapers use sub ohm setups.
Sub ohm is the technical side of cloud chasing. The science is simple: lower resistance plus higher power equals more vapour. The practical implications are larger devices, higher e-liquid use and lower nicotine strengths. Sub ohm is overkill for ex smokers but suits experienced UK vapers wanting maximum performance.
How sub ohm differs from standard MTL
Four key differences shape sub ohm vaping. The grid below covers each.
Low resistance coils
0.15 to 0.5 ohms. Below the 1 ohm threshold that defines sub ohm.
✓ HardwareHigh wattage
Typically 40 to 100W or higher. Far above MTL device range.
✓ Power neededOpen airflow
Wide airflow channels let vapour pass smoothly to lungs. Critical for the style.
✓ Design featureHigh vapour volume
Big visible clouds. Significantly more vapour than MTL produces.
✓ Cloud focusWhat sub ohm vaping requires
The table below covers the typical setup for UK sub ohm vapers.
| Component | Sub ohm requirement |
|---|---|
| Device | Mod with adjustable wattage 40W minimum |
| Tank | Sub ohm tank rated for low resistance coils |
| Coils | 0.15 to 0.5 ohm coils matched to your tank |
| E-liquid | 70/30 VG/PG or higher VG ratio |
| Nicotine | 3 to 6mg freebase, never high strength |
| Battery | Removable 18650 or 21700 cells, never built in for serious sub ohm |
Why sub ohm uses low nicotine
Sub ohm produces much larger vapour volumes than MTL. Each puff delivers significantly more nicotine than an equivalent MTL puff at the same strength. Using 18 or 20mg in a sub ohm device produces overwhelming nicotine hit and likely nausea. UK sub ohm vapers stick to 3 to 6mg as a result. The total nicotine intake can still be similar to MTL because of the larger vapour volume per puff.
Sub ohm vaping requires more attention to battery safety than pod systems because of the higher current draw. Use only batteries rated for the amperage your coils require. Check the maximum continuous discharge rating against your wattage and resistance. Most UK sub ohm fires and battery failures come from using low rated batteries with high wattage demands. Buying batteries from established UK retailers reduces this risk.
How to set up sub ohm safely
The checklist below covers what UK vape shop staff most often recommend.
Sub ohm setup checklist
Use four or more of these for safe satisfying sub ohm vaping.
- Buy a complete kit with mod and tank as your first sub ohm setup
- Match coil resistance to wattage stamped on the coil
- Use 70/30 VG/PG e-liquid for adequate wicking
- Lower nicotine to 3 or 6mg before starting
- Buy quality 18650 or 21700 batteries from established UK retailers
- Check the manufacturer wattage range on the coil before firing
Is sub ohm right for you
Sub ohm suits experienced UK vapers who use significant e-liquid volumes and want maximum cloud production or flavour intensity. It is not a good first vape for ex smokers because the low nicotine strengths fail to satisfy heavy smokers. Most UK vapers come to sub ohm after 6 to 12 months on MTL pod systems. The transition involves new hardware, lower nicotine and learning DTL technique. Worth it for those who want bigger performance.
Sub ohm is the hardware side of DTL vaping, which our our guide on what is direct to lung vaping covers, plus our article on what is a vape mod explains the wattage settings sub ohm vaping requires.
Frequently asked questions
Is sub ohm safer than MTL?
Both significantly safer than smoking. Sub ohm requires more attention to battery safety and produces larger vapour volumes.
Why does sub ohm use more e-liquid?
Higher wattage vaporises more liquid per puff. Larger clouds need more material to produce.
Can pod systems be sub ohm?
Some yes. Modern pod systems include sub ohm pods that produce small clouds at moderate power.
Is sub ohm good for ex smokers?
Generally not. The low nicotine strength fails to satisfy heavy smokers and the technique differs.
How much does a sub ohm setup cost?
60 to 150 pounds for the device and tank. Plus 10 to 25 pounds per week e-liquid for moderate use.
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