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I recently had to swap out my circulator pump (it was a Taco 00R-MSF1-4IFC, Taco technical support recommended the 0015e3-f4 as the current equivalent). I,m curious about how much head pressure my system has because I've noticed that the performance curves for the three speeds are not the same...

When a boiler modulates I understand it is reducing the firing rate. Is the most obvious evidence of this seeing the boiler drop the supply temperature below the set point? I would assume this happens when the delta drops below a certain number, and the boiler reduces the supply temperature...

I've attached a scan of the blueprint section showing the location of my HWBBs and I penned in the approximate runs of 3/4" PEX that connect them. The HWBBs are typical slant fin type stubbed through the floor. The system plumbed primary/secondary - with the primary loop being 1" and this...

I have a Navien CH210ASME-LP that was installed just over a year ago (my builder swapped it out on their dime for a CH210(non ASME) that had the 2 second burn time problem that he couldn't solve- verified gas pressure multiple times, swapped air pressure sensor, changed burner rods etc, but they...

Just over a month ago I had a new Navien CH210 ASME LP unit installed (it actually replaced a non-asme unit that was having issues with the infamous mis-firing- error 12). This new unit seems to fire up fine, but a few times now it has ignored my Honeywell heat only thermostat's call for heat. I...