Immersion Type Aquastat Controller & Oil Burner Primary ControlMade in the USA. Product Specifications BRANDHoneywell MAX OPERATING PRESSURE (PSI)200 Immersion Well; 100 Direct Immersion TEMPERATURE RANGE LOW LIMIT110-220 TEMPERATURE RANGE HIGH LIMIT130-240 DESCRIPTIONProtectorelay and Hydronic Heating Control LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERR8182D1079