I am considering whether I should update my wood stove. I bought a house last year that comes equipped with a quite old Jotul stove (series 8). My best guess is that it is about 25-30 years old. It is a fine, serviceable stove, but has some severe limitations, most notably that, despite my best efforts, I cannot get it to burn for more than a few hours, so it won't burn overnight. It heats up the main areas of the house really nicely for a few hours when tended to, but even when I stack the wood really carefully to ensure a long burn and close the vent to a crack, it still goes out after a couple of hours.

This is an issue in my house as I live in the Catskills and my house is only moderately insulated. I decommissioned the ancient furnace last year as it was on its last legs, and I was able to get better subsidies when I installed mini splits, which I use to both heat and cool my house. My plan, which has worked fairly well so far, is that I supplement the heat with the wood stove during the winter. The issue, as mentioned above, is that my wood stove is just not quite getting the job done. This means that I then rely more heavily on my mini splits to heat the house, especially overnight, which drives up my energy costs. During the coldest winter months, some of my bills were quite high. I think on average my bills are still fairly reasonable when averaged out with the spring and fall electric bills, which are fairly modest, but I am wondering if I had a better wood stove if I could rely on it more heavily for heating and bring my energy bills down.

I have read that the Woodstock Soapstone wood stoves are really beloved, providing long and efficient burns and great heating quality. My house is only 1500 sf (though it does have fairly high ceilings), so it's not a huge space I need to heat. Though right now I am mostly relying on the stove during the evening hours, I would love to be able to maybe even run the stove around the clock when it's especially cold, though only if it didn't mean I was ripping through my wood. Obviously there would be an initial outlay of money but there are good subsidies right now (30% up to $2k), which may not be in place after the election, depending on how things go. But even if the subsidies remain in place, I would still be looking at spending a couple thousand dollars up front. My bills are high, but not in the thousands (I think my largest electric bill last winter was around $650).

I should say, too, that my interests aren't entirely the economics. I am also curious if this stove would provide a drastic improvement in my ability to comfortably heat my house without constant tending to the fire. But the economics are the primary driver.

TLDR: would replacing old wood stove with Woodstock Soapstone stove save me money in the long run?

Edit: Jotul is series 8, non-catalytic. Manufactured between 1991-1993.

I found a used Hearthstone Heritage Stove for sale near me (haven't gone to check it out yet). It seems like it's in good shape, except a little rust on it as it's been stored in a garage. From 2014. Would this be a good stove for a big 1500 sqft room? And what would be a fair price for this?
Any suggestions welcome -- I really don't know what it is I don't know