Honestly, if you don't mind replacing coils every couple weeks, I'd go with this..... great vape, super easy, and coils are fairly cheap
ASPIRE VIVI NOVA-S GLASS - Clearance You don't want to dry burn these, but if the vivi nova you posted has a cotton wick, you don't want to dry burn that either. The older ones had silica wicks that you could dry burn. That being said, here is how you do it, if you use something that can be dry burned.
Unscrew the post from the tank. Put the post on your battery.
Take off the silicone thingy so you can see the coil
Pulse batt in 4 second increments. It'll smoke and smell a bit, no worries, that is just burning off the crud.
Continue this til you no longer have smoke and smell and you can see the coil burning bright orange, evenly.
Rinse the head (I usually took it off the post to do this), pat dry on paper towels and replace
put it back together and fill. First few hits will be weak to non existent due to water on the wick, just vape through it.
They didn't have watts when I was using these, but used em for years (full sized) and loved them at the time. Depending on the ohm of your atty, say 2.4, you could easily vape around 4.3 or a bit higher Volts, which would be more than 5 watts, but don't know how to convert it. They have calcs for that I'm sure. I used these when there was no good bottom coil device available that didn't leak.