New house, new setup, lots of my old installed parts reused. I have a Grundfos 26-99 (3 speed) or a Taco 007 (stainless) to choose from. My boiler is 25' from the house, I'm using 32mm Logstor. I'm feeding a 20x20 heat exchanger and a sidearm exchanger. From the basement penetration to the two exchangers is about 20', and that will be plumbed in 1" PEX. One big loop. There's a few 90's in the mix, but nothing too crazy.
I *think* the 007 will supply enough flow to be adequate. My concern is that it's internal bore is about that of 1" copper's ID, whereas the 26-99 is a lot larger. Eventually, I'm upsizing the heating in this house with radiant floor heat, and I may even heat my detached garage at some point. This setup is long-term temporary, if that makes sense.
I was initially going to go with the 007, but now I'm leaning towards the 26-99 running on low. My last house had a much bigger heat requirement from a longer run (~85') of 1-1/4 PEX and that pump on low was more than enough to get the job done there.
Thoughts?
I'm not buying a new pump anytime soon. I want to use what I have for now.