Reddit reviews Roots & Branches VKP1056 Stainless Steel Flat Canning Rack 12" Diameter

We use a Ball 21 quart on our glass top and it is fantastic. Fits about 7 quart jars (depending on wide-mouth / narrow-mouth). We love it. It was a bit pricey, but totally worth it to speed things up when canning big batches.

We also sprung for the stainless steel jar rack, since the standard ones always tend to rust at the welds after a couple of months of use.

1. No
   
   
2. Not the best procedure, I usually keep the Apple butter in the big pot it cooked in, filling the jars just before they go into the canner for less thermal loss and less thermal shock. And, no, don't stack the jars in the canner.
   
   
3. never seen any recipes for small jars, but I've got a special rack that's not divided, and holds more than the standard 7 jars when using 8oz, or smaller, jars.
   
   
4. Apple butter cooks down for a long time, peels shouldn't negatively effect the end product as long as you wash the apples well and follow canning cleanliness procedures.
   
   I've been processing mine in my Squeezo strainer for decades, before that, a manual food mill, peeling was not part of the process.
   
   Bonus timing; I'm canning Apple Butter today! ;)