MolyArmor 350 helps protect exchangers and pumps against solids adhering to system parts. It also inhibits rust and corrosion to your firebox from the inside by treating the water.
*MolyArmor has replaced the discontinued 1650XL Corrosion Inhibitor
MolyArmor 350 Corrosion Inhibitor will help ensure that the water jacket doesn't suffer a corrosion failure when the system's water is maintained with MolyArmor 350 at the recommended levels, and the pH and makeup water quality is as recommended.
Equally important is Ashtrol (p/n 297) which neutralizes ashes, which are highly corrosive. These are basic maintenance items that will absolutely determine how long your furnace will last.