Honeywell High Limit Aquastat Controller W/ 100 F To 240 FHigh Limit Aquastat Controller with 100 F to 240 F operating temperature and 7 F 4 F Differential. Product Specifications BRANDHoneywell INSULATION DEPTH INCHES2-1/4 WELL SPUD SIZE INCHES3/4 NPT TEMPERATURE CONTROL RANGE °F100-240 Stop Set at 150 SWITCH TYPESPST, contacts break on temperature rise APPLICATIONHigh Limit DESCRIPTIONHigh Limit Aquastat Controller LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERL4103A1100