WRS Series Pipe Pume These series are WRS pumps.The WRS pump is an air venting pump.It is equipped with an air vent tousing,suitable for using in conjnction with any commercially available automatic air went,vertical mouning of the air vent at any pump position.Motor overload protection is not required.The motor operates non-overloading. These pumps are suitable for heating water to VDI 2035 and water/glycol mixtures up to a ration of 1:1,They are extremely reliable,economical and quiet to use,being particulary suitable for domestic applications such as central heating installations,industrial circulating systems,air conditioning and chilled water circulation systems,etc. Working conditions Fluid temperature rang:-10+110 Maximum ambient temperature:40 Manual 3-speed control