* Propane, match lit models (LP suffix); Natural, spark ignition models (SI suffix)

* SALES OF MATCH LIT MODELS THIS SERIES LIMITED TO CURRENT AVAILABILITY

In 2005, the U.S. Congress enacted the Energy Policy Act of 2005 (EPACT). 

In this act Gravity Vented Unit Heaters were identified for improvements in 
energy efficiency.

The law requires any units manufactured after August 1, 2008 to have:
1.     an intermittant ignition device (no standing pilots) and 
2.     either a power venter or an automatic vent damper. 

Reznor wants you to be aware of this change and not end up with any 
non-conforming inventory in your stock at that time. 
We suggest that you purchase any 2008 EOP for Gravity-Vented units 
(Models F or B) with option AH3 (Spark Ignition with 
timed lockout). The AH3 option has been modified to be forward 
compatible with the new regulations (on all units with AH3 
manufactured after September 4, 2007). We will also offer a 
Ship-Separate Option AV7 (Automatic Vent Damper for you to 
bring into stock. You can continue to sell match-lit pilot 
units until next August, but we do not suggest bringing them 
into stock in any large quantities. 

Units that you may have in stock next August that may not conform 
can be field converted. This requires changing out the 
ignition controller to the new AH3 style controller. A conversion 
kit will be offered in the future.

In the July Price sheets, it was also noted that the AH2 option 
(Spark Ignition) will be discontinued from the F & B line 
in September. 

Link 
to the full 2005 Energy Act verbiage

For Canadian Distributors: 

In April of 2007, NRCan proposed to harmonize Unit Heater Efficiency 
requirements with the new EPACT 2005 and with 
California State regulations. At this time, it does not appear that 
this has passed into CSA regulations, but the 
suggested time frame was August 8, 2008 just like the EPACT laws.

Link to the 
initial notification from NRCan