Honeywell Circulator Control Low Limit Aquastat Controller W/ 100 F To 200 FCirculator Control and Low Limit Aquastat Controller with 100 F to 200 F operating temperature and 5 F to 30 F adj. Differential. Product Specifications BRANDHoneywell LENGTH INCHES2-7/8 DIAMETER INCHES3/8 TEMPERATURE CONTROL RANGE °F100 to 200 SWITCH TYPESPDT APPLICATIONCirculator Control and Low Limit DESCRIPTIONCirculator Control and Low Limit Aquastat Controller LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERL6008A1242