Grundfos Circulators - What's the difference?

[Marshy]

I need to replace a Grundfos UP 15-42F that is not working in one of my zones. It is blue in color but I also have a red one for a different zone. I dont understand the difference between the two. Can anyone explain a difference besides color?

 

[maple1]

Do they have different electrical hookups? Looks like one has a pig tail of some kind with it - the other just bare terminals? I wouldn't think the circ itself would be any different.

 

[maple1]

(Don't think I've seen a Grundfos with that type logo before - on the blue one. I'm curious....)

 

[Marshy]

Might be an older model..? I wish I could find some manuals or something on them.

 

[maple1]

Pretty sure they also take their circ bodies and adapt or mod them for specific applications. My LK810 has a 15-58 in it but I dont think I could unbolt it and put an off the shelf 15-58 in. Although I haven't fully investigated that.

 

[Bad LP]

Agree on the logo but it may have come off a blue boiler like a Boderus.

 

[Marshy]

Well, here is the blue in I have.

Here is the red one I have.

The one not working is the blue one. Best I can tell either one will work, both are UP15-42F... I'd rather not have to buy an entirely new pump if I didnt have to but I dont know that i can get just a new motor and impeller.

 

[Former Farmer]

You can purchase a cartridge replacement kit for the UP15-42F, but it looks like it is just a s expensive as a whole new unit.

https://www.supplyhouse.com/Grundfo...15-volt-5571000-p#replacement-parts-container

 

[Marshy]

Yeah, that's what I was starting to conclude. A whole new pump appears to be the same cost as the kit.

 

[E Yoder]

I've seen black (instead of taco green) Taco circulators that came with the boiler when new. No difference other than paint from what I could see.

 

[Highbeam]

The red one has the 230 max temp stamp and the blue one doesn't. Maybe the blue is for cold water?

 

[salecker]

The first blue one has the same max temp

 

[Highbeam]

The red one has the 230 max temp stamp and the blue one doesn't. Maybe the blue is for cold water?

Woops, it was written differently and I missed it. Sorry.

 

[Marshy]

I wonder if red is indoor use only but blue is indoor/outdoor..?

Idk, if I get a chance I'll ask supply house.