Grundfos 59896771 1/12 HP Stainless Steel Circulator Pump - High Efficiency Water Circulation for Home Heating & Hydronic Systems

A great price, worked perfectly. Doesn't hurt to add a simple timer so that it only runs during the hours you'l need it. They make units with built in timers but I'm of the mind that its better to have dedicated devices so that if one part fails you just replace that part. Don't forget to consider getting the cast iron flange set and a check valve.