Honeywell Combination Protectorelay Hydronic Heating Control W/ High LimitCombination Protectorelay and Hydronic Heating Control with High limit: 10 F fixed low limit/circulator: 10 F to 25 F adj. Differential. Made 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 DESCRIPTIONCombination Protectorelay and Hydronic Heating Control LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERR8182D1111