Suburban On Demand Water Heater Water Schuste Module Board 521338 IN-STOCK Version: OEM (Suburban Manufacturing) UPC: 755790718290 MPN: 521338 SKU: 521338 Note : this module board is only for older versions of ST-42 that uses Schuste control center (link): 233678 . The newer version of the module board is Telco (link): 521492 which only works with Telco control center (link): 233797 . These module boards / control centers are not interchangable. Applicable To Model (Schuste): ST-42 Updated On: 3/11/26
