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Immersion-type controllers that combine high limit protection with switching relay control of burner and circulator motors. Features: High limit opens burner circuit only. Select models include transformer and accessory terminals for adding a remote low limit controller. Case available for horizontal or vertical mounting. Requires a 24 Vac thermostat with heat anticipator set at 0.2A. TRADELINE models include well adapter tube of heat conductive compound and range stops.