I bought an EPA compliant stove about 14 years ago. Based on your experience I suppose it is no longer compliant. The stove works well and is the right size for my 2000 sq ft house.
Some of the newer “clean burn” inserts and wood stoves work pretty well, actually. More heat, better burn. I couldn’t care less about emissions, but if they’re better then so be it, keep the b-tards off my back. I keep waiting for them to use those ceramic thermo-electric generators on the backside of the firebox to run blower fans. Not aware of any on the market yet, but it’s coming. They just hate it when “green” works for off grid independence, it’s meant to ensnare, not liberate, lol.
Ours was a little older than that. It was in the house when we bought it.....before they made all the silly laws. The pellet stove did go non epa compliant after we bought it. If you find the model number and serial number on the stove there are places online you can check to see if they’re epa compliant.
Here you can’t sell your house with a non epa compliant stove in it. If you leave it in you have to fill it with cement where it’s non operable. Nazi bastards.
Since ours is an insert it’s just easier to restore the fireplace.