Wilo 2085590 Stratos 1.25 by 3-25 High Efficiency Hydronic Circulating Pump, 230-Volt Uses 2 Bolt 1.25-Inch HV flanges (not included). 3 - 25-Feet shutoff head Temperature range 14 Degree Fahrenheit to 230 Degree Fahrenheit Up to 80 percent power saving compared with constant speed circulating pumps Pump communication with IF (interface) module that can be easily retrofitted: ideal external operation Fits most standard hydronics applications. Not approved for domestic hot water