Having asked before and not getting an answer, I thought I'd try again:
I have a Buderus boiler with a Taco 0010-F3 circulator pump for the heat. There are 12 zones of baseboard and 3 zones of radiant. Each radiant zone has it's own circulator, plus there's one more for the hot water.
The main circulator hums, although it seems to be working just fine. Can any of you HVAC guys recommend a better circulator pump for the baseboard heat? I'm looking for high quality, but less hum.
Thanks,