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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
Drop-in Replacement: Verified identical to Watts 382820 and Weil-McLain 511-546-950 for simplified field inventory
ensuring stable environmental control in direct-fired equipment
Look for visible signs of "swarf" or metallic debris near the hub
and GUH series units
Lochinvar & A.O. Smith 100208468 Control 321894-709 Drop-in Replacement: Verified identical toThe Lochinvar & A. O. Smith 100208468 User Interface Control is a critical OEM replacement part engineered for precise management of commercial boiler and water heater systems. Designed to replace legacy part numbers RLY20031, RLY20031K, and 100167553, this control board serves as the primary communication hub between the technician and the appliance's internal logic. It is specifically calibrated for the Copper Fin II series, including models CF 402
US$ 25.99
US$ 420.00
US$ 36.99
US$ 195.00