59896341 UPS15-58FC Super Brute Circulator, Red, Small

Put this on my natures comfort outdoor wood stove. Worked well and was easy to install. Good quality built and good reputation. This is my second one.

The Grundfus Circulating Pump was ordered on a Friday at 5:00 pm and it was delivered (free) to my door the following Monday at 9:00 am. It appears the unit was shipped from Mississauga, ON vs. the Seller location in Victoria, BC. The Amazon pricing was very favourable compared to local bricks & mortar vendors. Packaging at the Amazon Distribution Centre was adequate but not outstanding... Grundfos documentation states: "Take care to ensure the pump is NOT dropped or mishandled; dropping will damage the pump". Clearly written & illustrated instructions are included together with a pair of new rubber gaskets. The replacement pump was virtually identical to the original 18 year-old unit with worn out bearings. Installation was straight forward and took less than 5 minutes (excluding preparation & clean-up). I'm disappointed Grundfos does not design these units to be refurbished with new bearings & seals but recommends "Disposal in an environmentally sound way". Overall, a very good experience and highly recommended.

Quiet and reliable. Wish it had an integrated bleed valve (maybe they do now, they didn't in 2016). I'd recommend installing a ball valve with bleeder on the inlet side (bleeder facing away from the pump) if using for recirculation, bleeding the system is critical for operation, and has to be done every time my plumbing is drained. Ymmv.

Installed in the circulation line for our underfloor garage heating system. At first it squealed quite a bit and it didnt seem to be moving any fluid at all. I uninstalled it and removed the white plastic backblow valve on the output side of the pump, then primed the pump from the output side but filling the line with fluid and reconnecting it. After that the pump was nearly silent and we could see the fluid moving very quickly through the lines. If this pump is operating properly you shouldn't hear much noise, its a barely noticeable hum.

After 20 years of service in our radiant floor heating system 1 of the 2 Grundfos pumps began running noisily. Probably my fault for unknowingly letting it run without water for some period. Not good. The original unit (UP15-18SF)was no longer available so ordered the UPS15-58FC as the replacement. The install was a perfect fit and fairly easy except for one thing. The sealing gaskets included with the new pump leaked. I took it back apart and used the original gaskets from my old pump (see picture) and it sealed up perfectly. It may just be my old fittings but something to be aware of.