I've learned that my preferred method is MTL and the zenith tanks I bought are right up my vaping alley.............My question is how long do these zenith tanks last? do they have a life span? do folks clean them out from time to time? do I need spare o-rings?
"My question is how long do these zenith tanks last? do they have a life span?":
First, I'm glad you're liking the Zeniths you contacted me about. They're my all-time favorite tanks, and I've had
at least 2 of them (1 full-size + 1 D22 3mL one) in constant use and sometimes a 3rd one in use... since December of 2018. Based on their performance and durability so far...there will likely still be a gracious plenty of them, still new-in-the-box in my stash, after I'm long gone!
I've had absolutely no issues
at all with any of them. The turn to fill top part is still working as smoothly as it always has, on all of them. None have had any issues at all with leaking (from the top fill hole, the base connection, nor the airflow holes). As far as needing replacement glass for them...their glass
isn't replaceable. It's likely because that's not a concern, because of the design of the tank and the thickness of the glass. I've dropped or knocked over each of mine numerous times (on carpet, lineoleum flooring, asphalt, concrete, etc.) and
none have ever chipped, cracked, nor broken. The metal housing protecting the glass does exactly what it's meant to do. In all those drops, I've gotten 1 very tiny ding in the top edge of the metal on 1 of them...which is barely visible to the naked eye. The threading on the connection of the base (the only place there IS any threading) is still perfect.
"do folks clean them out from time to time?":
The only time I take a Zenith apart, which means simply removing the base, the coil, and the drip tip from the top...is when I change to use a very different eliquid in 1 of them...than what was in it. Then I just run the tank, base part, and drip tip under some warm to hot running water, and dry them off. Each time I replace a coil, I just wipe out the bottom base, use a piece of twisted paper towel to clean out the chimney, and run a Q-tip through my drip tip. That's it!
"do I need spare o-rings?":
There
are no o-rings to replace on any of the 3 versions of the Zenith tanks themselves. The only visible o-rings...are 1 on the base of each coil and 2 small ones on the drip tip. Each replacement coil comes with an o-ring already on it, and I've never had any problems with the 2 small o-rings on my drip tips...despite how many times I've removed and replaced them from the tanks.
All in all...in my experience with them...they're by far THE most troublefree, easy to use, well-designed, and durable tanks I've ever had.