L8148E1265 - High Limit Vertical Mount Aquastat Relay, 15 Degree DifferentialResideo Aquastat Relays Specifications Resideo Honeywell L8148E1265 Aquastat Relay, 180 240 F range with 15 degree F fixed differential, low volt millivolt 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