The only Leafs without battery heaters will be most 2011 Leafs - and maybe a few early 2012 cars. Since those will have terrible range in Winter anyway, just look for a Leaf built 4/2013* or later, and it will have both the battery heater and the better battery chemistry.
* There may be at least one April build with the old chemistry. To be really, really safe, look for a Leaf built 5/2013 or later. I'll have to put this new caveat in the guide.
Brilliant Silver 2021 Leaf SV40 W/ Pro Pilot & Protection
2009 Vectrix VX-1 W/18 Leaf modules, & 2 lithium E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.