I take pride in my knowledge so if anyone can explain this to me so that maybe someday I could explain to another, I'd be very appreciative. I've got the Aspire Atlantis V1 tank, before today I've heard that .3 ohms was the lowest this tank can handle. Today I was told not to use the .3 coil that the Atlantis V1 wasn't meant to use it. However, I know a guy who has the same tank and uses .15 Nickel coil on a non-TC mod. So, here's what I don't get, if the Atlantis V1 isn't what it's meant to use then how come these coils CAN be used with this tank? Is it a sort of precaution, like proceed at your own risk, or is there an actual reason behind it?
Yikes. I don't even know what to say about the guy who vapes nickel in power mode.
As for your question, it's not the resistance of the coil that matters, but the temperature. After all, power (which generates heat) is what lights our coils and excessive heat is what we want to avoid. Whether a tank can "handle" a specific temperature depends on the materials used in its construction (mostly the insulator is of concern). This is why most people prefer that these companies use PEEK insulators since they have a high resistance to heat. There are many cases (see the original Subtank Mini) where low quality insulators ended up melting and people inhaled the fumes (see PBusardo's "monkey ..." comments).
But there's nothing special about a .3Ω coil in itself, it's just that such a coil will typically need more power (because it has a larger mass) than a higher ohm coil. So, it all depends on how hot you vape and whether the tank can handle the heat. I don't know much about the Atlantis but Aspire is usually pretty good about using high quality parts, so I would be very surprised if the Atlantis had any problems with a typical .3Ω coil setup.
IIRC, the insulator is on the coil itself, which means that the tank you use should not make one ounce of difference.
