Important notices

• Firmware change to the SIM module in VFC 150 and VFC 225 models
• Firmware change to the SIM module in SL Series G1 (SL 115, SL 160, SL 175, SL 199, SL 260, and SL 399), SL Series G2, SL 260 G3 and SL 399 G3 models
• Recommended temperature and pressure relief valves - InterStor IWT indirect water heaters
• Firmware change to SIM+ module for SL G3 residential models
• Software update release 1.10.3 (see software download)
• 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