25-inch dial interface

reducing soot buildup and burner vibration

This genuine Spence replacement part is fabricated to withstand temperatures up to 750°F (399°C) depending on the valve body material (cast iron or steel)

It is compatible with a wide range of Star and Grill-Max units

This duct-mounted transmitter features an 8-foot copper averaging element paired with a 1-foot copper capillary

Lochinvar & A.O. Smith 100208458 Control Board 320734-701 25-inch dial interfaceThe Lochinvar & A. O. Smith 100208458 Interface Control Board is a critical genuine OEM replacement designed for professional grade hydronic and domestic hot water systems. This high performance interface control board, also identified by the legacy part number RLY20058, functions as the primary communication bridge between the user interface display and the main integrated boiler control. It ensures precise data transmission for monitoring modulation