The Honeywell HWL8148J (also known as L8148J1009) is a professional-grade immersion-type Aquastat Relay designed for hydronic heating systems. This gray-colored controller combines critical high-limit protection with switching relay control for both oil burners and circulator motors. It operates on 120V AC with a temperature range of 120 to 240 degrees Fahrenheit and a fixed 8-degree differential. The unit features SPST switching action, includes a transformer for adding a remote low-limit controller, and is designed for versatile horizontal or vertical mounting. This specific unit is in salvage condition and is classified under the plumbing category for HVAC application

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