this model is a 120Vac energized valve and cannot be powered by a thermopile or millivolt circuit

Is the HH18HA490 compatible with my older HH18HA292

a 45-99°F setpoint range

This is designed as a high-limit safety control

Lochinvar & A.O. Smith 100313878 Pump 320720-756 this model is a 120VacAs a seasoned technician, you know that maintaining precise flow rates is non negotiable for high output water heaters and boilers. The Lochinvar & A. O. Smith 100313878 Pump is the direct OEM replacement circulator pump designed for seamless integration into high efficiency hydronic systems. Operating on a standard 120V power supply, this Grundfos UP26 96SFC model features a durable stainless steel housing, making it ideal for open loop potable water