Secondary HW pump connection/fittings

[OwenF]

I’m looking at installing a secondary circulating pump. The ‘go-to’ seem to be Grundfos comfort or these:

https://www.anchorpumps.com/lowara-ecocirc-pro-15-1-65br-1-2-bronze-circulator-with-temp-control-240v

 

I cannot for the life of me figure out the fittings needed to take this down to 15mm copper. Ideally I also want to put 1/4 lever valves either side for easy maintenance.

 

These HRC pumps seem to have either 1/2” female parallel or 1-1/4” male parallel ports.

 

What fitting would I need to drop either of those to 15mm copper?

 

These look perfect

https://www.toolstation.com/perfect-pump-valves/p52920

but I’m pretty sure are 1-1/2 on the pump side (normal size for main circulator?)

No apparent equivalent for 1-1/4 port

Edited January 10, 2024 by OwenF

[JohnMo]

This mine installed, used 1/2 to 15mm compression fittings. No 1-1/4 ports?

 

[OwenF]

Great, thanks. It was your posts that led me to the Lowara pump.

 

I can see a lot of adaptors between the pump and the copper. Any chance you can recall what each is?

 

Looks like:

pump

1/2” male to ? female coupler

NRV (1/2 to 1/2?)

1/2” female to 15mm compression bend

copper

 

the one out of sight looks simpler

 

My understanding is the 1/2” male into the pump has to be taper, or if parallel needs to be a union with washers.

[JohnMo]

1 hour ago, OwenF said:

Great, thanks. It was your posts that led me to the Lowara pump.

 

I can see a lot of adaptors between the pump and the copper. Any chance you can recall what each is?

 

Looks like:

pump

1/2” male to ? female coupler

NRV (1/2 to 1/2?)

1/2” female to 15mm compression bend

copper

 

the one out of sight looks simpler

 

My understanding is the 1/2” male into the pump has to be taper, or if parallel needs to be a union with washers.

I know a bunch of fittings came with the pump, including nrv. But cannot recall exactly what. I would wait until you get the pump and go from there. They change design all the time,