Extreme Temperature Durability: Equipped with high-quality synthetic rubber diaphragms that remain flexible in low-temperature gas service

clunking noises

For fail-safe operation

This specific secondary anode outlet is designed for models requiring a 3/4" NPT fitting with a 5" nipple extension

Is this unit compatible with 3-phase power

Lochinvar & A.O. Smith 100074451 PCB 324846-701 Extreme Temperature Durability: Equipped withThe Lochinvar & A. O. Smith 100074451 PCB is a critical integrated control module designed for high efficiency commercial and residential water heaters and boilers. Known as the MC50 PCB, this genuine OEM component manages vital system operations including ignition sequences, temperature regulation, and safety circuit monitoring. Engineered for a precise fit in Lochinvar Knight and various A. O. Smith tankless models, it ensures absolute signal