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Aquastat relay choices from Grainger operate with a 24VAC thermostat or a 750mV thermostat, depending on the model. Choose from immersion controllers, universal electronic, multi-zone and dual aquastat controllers with a variety of temperature ranges and differentials and SPST or SPDT switching types. Check to see whether mounting is horizontal, vertical or horizontal and vertical. Find the aquastat relay that fits your application at Grainger!