| Production Run | Dates | Serial Numbers | Notes |
|---|---|---|---|
| Start | May 1999 | 001001 | |
| Rev. 0.1 | Jun. 2000 | 001971 | Changed from charcoal to black paint |
| Rev. 0.2 | Jun. 2000 | 002045 | On/Off/T-Stat switch moved |
| Rev. 0.3 | Aug. 2000 | 002066 | Top convertible pilot assembly, built as NP (built as NG, LP kit included) |
| Rev. 0.4 | May 2001 | 002506 | Restrictor plate, thermostat & wire included |
| Rev. 0.5 | Sept. 2001 | 002607 | New pilot light shield |
| Rev. 0.6 | Jan. 2002 | 002775 | Externally adjustable air shutter |
| Rev. 0.7 | Jan. 2002 | 002807 | Built-in restrictor plate |
| Rev. 0.8 | Mar. 2002 | 002933 | Easy off front |
| Rev. 0.9 | May 2003 | Uses blower 93-57000 | |
| End | Feb. 2004 | 004249 |