Congratulations on your purchase! I hope that your stove will provide many years of reliable use for you.
Now, about that Accentra for $2K..........
. In general, if your experience level cannot tell you whether the used stove is worth the purchase or not, it's better to spend a little more and get the stove new with a warranty.
Otherwise, it's a roll of the dice. And for something as important as having a reliable element for your home heating system, for $2K or for even less money, I don't think it's a risk worth taking.