GrundfosUP15-29SU/LC 59896776

This is an excellent circulating pump for a hot water heater. The last one I had lasted for 18 years. They run quietly and smoothly, especially if the water is soft. They are easy to install. I would highly recommend this pump. The only downside is they are a little pricer than some of the other brands on the market. But you ofter get what you pay for.

Good quality sort of expensive

Started working the moment it was plugged in. I had bought a Taco pump (what I already had) as an initial replacement but the plumber came back and indicated it was faulty, when it appeared it was not working. Amazon agreed to return (Thanks). I then bought an different Grundfus due to bad communication from Plumber, who asked me to return and get this pump (for a whole house hot water recirculation). Thanks to Amazon for allowing the return of the wrong pump also.

This was a replacement for a same unit and the hook-up (Undo the pipe nuts, put in new unit, tighten nuts back up) should have been a 5 minute job but they do not include the union washers (yes I looked under all box tabs). Turns out they are not a common item and it took a half day and 5 different hardware/plumbing stores before I found a set.Once the unit was back in it just sounds lovely, compared to the unit I had to repalace which would have been 7-8 years old.

No instruction with the pump

This unit was the best I could find to replace an older Grundfos model, UP 15-18 SU, which "gave up the ghost" after many years of service (when the internal shaft seal began to leak into the motor compartment). The new model is a single casting in stainless steel, rather than fabricated from multiple parts, and I suspect the coupling between motor and impeller may be magnetic rather than a "thru shaft" (but not sure). New unit has a three prong plug, so most time (30 minutes) in re-installation was spent wiring a three prong (two plus ground) receptacle into the thermostat circuit, rather than "hard wired" . . . better for next time I replace the pump, if I should live so long. Replacing the pump, itself, took five minutes with no leaks . . . couldn't be easier. Coupled with the Polaris 199,000 BTU per hour water heater, we're back with a warm house. Criticism of Grundfos is that they have forgotten that the "user" may not know how to cross reference old units to new units for replacements . . . my selection was an "educated guess", and I was not sure of my choice until I actually had the unit "in hand", installed, and felt the supply manifold go from cold to almost instantly hot with the quiet hum of the running pump.

Was a direct fit to replace my 20 plus year old pump. Easy 10 min. replace, and working perfectly. Great to have instant hot water again.

Can't go wrong with Grundfos products. Great recirculating pump!