- Software update release 1.10.3 (for software download see Downloading_software_program_to_USB_or_SD_card.htm).
- Fortified single-prong and double-prong ignitors
- HC 33-160 & DC 33-160 - Heat Exchanger Gasket Upgrade Program
- Change to exhaust and intake ducts for some SL G3 models - effective December 2018
- Change to the SL 260 G3 and SL 399 G3 boiler front covers
- Change to the SL 260 G3 and SL 399 G3 boilers
- Fenwall discontinuation