A little more on TACO 007 and B & G NRF-22
Hydronics Man and other folks, thanks for the tips !
Another warning: LONG POST AHEAD
You are right, the B & G is warranted for 3 years. That was another reason I reluctantly switched from TACO. I think TACO's warranty is about 1 year. That should help in any immediate manufacturing quality problems. Still, I think most pumps from any manufacturer are designed to last well past the warranty period if you design the system well and install it right. Its the pump longevity that counts.
After I installed the B & G circulator I made sure it was filled with water and drained air from every system drainage location I could find. When I started up the system, I heard a kind of "washing machine" noise for about a minute. Then it settled down into a steady water flow with a quiet hum. I think I'm okay, but it scared me a bit.
I checked boiler parameters and the house radiators and all looks good so far. I'll just keep checking periodically. My tenants are pretty pleased, too.
I do not know how quiet the TACO 007 is compared to the B & G NRF-22. However, the new B & G is much quieter than my old Grundfos. A guilty confession: I actually prefer the low maintenance, water lub. pump design for this system. This house is almost 110 years old so there is always something to do. A zero to low maintenance pump is one less thing to worry about.
My dad's new boiler system is about 4-5 years old and warrantied, I think, so I'm pretty sure he's okay. He contracted one of the best (and $$$) firms in the area so if something happens, he won't have to fix it himself.
No need to write back. Just adding a little to the thread.
Thank you HMan, and thanks everyone !