I found a Regency wood burner insert for $600 on Ann Arbor craigslist. The only number they found on the door was 342-071(or 9). The seller bought it used and was told it was a 5yr. old unit with 78% burn eff. Can anyone confirm any of these claims? Here's a poor pic. Thanks, Choco. p.s. The seller's throwing in a used chainsaw!