The Harvest was a bit of a "problem child" for Hearthstone. It had both front and side loading doors, burned 20" logs, and had a reversible 6" top or rear flue collar.
The Harvest was Hearthstone's original EPA Phase II "clean air" model, and incorporated a catalytic converter. It was introduced, as Stoveguy notes, in 1988: due to performance problems in the field, only 375 of those original models were produced. After a revamp of several internal components, production continued in 1989: in the ensuing three years, another 624 of the modified Harvests were sold.
Problems persisted, and a final reworked version, Harvest Mod A, was introduced in October, 1992. The final version worked much better, but was still somewhat "draft sensitive" (needed a strong updraft), and, like the earlier versions, required much time-consuming babysitting at cold startup, until the stones heated up enough to activate the catalytic converter.
We burned a Harvest Mod A on our showroom flue, and given the extreme updraft our 35' chimney produces, it worked just fine, except for a tendency for the catalytic converter element to load up. We sold it to a couple with a flat-roofed single story house, which proved to be a mistake: even after we added as much chimney as we felt we could adequately brace (about 8' above the flat roof), the updraft was insufficient to drive the Harvest with the cat engaged.
Hearthstone finally said goodbye to the Harvest, and catalytic reburn technology, in September, 1995. Today, parts availability is a bit of an issue: replacement catalytic converter elements, for example, are not available from Hearthstone, but can still be purchased from Woodmans.