Review on AB WiseWater Hot Water Circulation Pump for Hydronic Radiant Floor Heating, 3-Speed Switchable Internal Threaded Flanges, Ideal for Water Heater Systems by Gilbert Pfaff

I have purchased three of these pumps and three times at different times. The first of the pumps worked for a day before I removed it for another solution. The other two were purchased for delayed work. The only pump that worked was that it only worked in one physical orientation which the manual says CANNOT be used. The other two didn't work at all. All three pumps showed that the main shaft came loose when shaken. All three pump flanges had 1 inch iron pipe threads that were too large to seal against leaks. I have never met a lower quality pump and can't imagine this one.