UP10-16 PM BN5/LC Comfort PM Pump (1/2" FPT)

Easy install. I installed a dedicated return line, and tied it into the hot supply under the master and main bathrooms, then connected it through the pump into the cold intake on the indirect water heater. Pretty straightforward. The instructions are very clear about positioning the pump upright and on it's side. Honestly, I think it would work just as well as long as it's on it's side but didn't want to take any chances so I did a few extra connections to keep it exactly as per the picture instructions. It's VERY quiet. You can't tell it's running unless you put your head right next to it. Now we've got nearly instant hot water at both bathrooms. it's even much faster to the kitchen and laundry room now. Tying it into the PEX was really easy using the 1/2 to 1/2 threaded to pex adapters (see recommended accessories).

This is a terrible pump. Apparently, SupplyHouse is not an approved distributor for this pump, so they don't offer Grundfos technical support, could not answer my questions about the problems encountered. Grundfos does not provide support either. Support is only offered through "factory" trained reps. It took significant time and effort, but I tracked down two different reps. Unfortunately, I got different answers from each to questions about this pump. The pump would not push hot water thru my system. First, I was told that installing a spring value, instead of a swing was the problem. The pump is supposedly not strong enough to push water through a spring valve, according to 1 rep. That's not clear in the documentation, because there is no indication as to the PSI when the pump is on. I used a sharkbite spring valve with indicated minimum 2 PSI to push water through the valve. One rep told me this pump operates at less than 2 PSI. But, swing valves are even more difficult to push water through, indicated at 2 to 3 PSI. Still, I replaced the check valve at the advice of one of the reps, from spring to swing. That still did not work. Then, I was told to make sure the line was bled of air. It was. This pump simply would not work. In addition, I used tape and plumbers putty on the threads and tightened the connections as tight as possible. There was a small leak at the threads that was impossible to stop. Aslo, be aware, this product does NOT have the AutoAdapt feature in many Grundfos pumps, although the included documentation references it. There is only 1 setting on the pump, continuous operation. It frustrates me tremendously that Grundfos does not provide direct support for its products, its documentation is so very poor, and there is so much confusion as to the features and operating capability of the pump. And, this pump simply did not work. I will never buy another Grundfos product again.