Honeywell High Limit Circulator Aquastat Controller W/ High LimitHigh Limit and Circulator Aquastat Controller with High limit : 10 F fixed low limit: 10-25 F adj. differential. Product Specifications BRANDHoneywell TEMPERATURE RANGE LOW LIMIT110-220 TEMPERATURE RANGE HIGH LIMIT130-240 SWITCH TYPESPST: High Limit & Circulator APPLICATIONHigh Limit and Circulator DESCRIPTIONHigh Limit and Circulator Aquastat Controller LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERL4081B1047