Ages ago, the (then) US Bureau of Standards decided to test whether hot or cold water froze faster. So they made the tests and the cold water froze faster. They then realized that, as scientists, the… (View Post)

I have an Ultra 3 80,000BTU/hr unit. Primary/secondary setup for the heating zones, but direct for the indirect. Zoned by circulators. Boiler priority 1 is set DHW direct, pump 1 (for the indirect) i… (View Post)

I wonder what good that code does. When my mod-con was installed, the contractor used purple primer on all the supply and exhaust PVC pipe. So it passed inspection. Now for many of those joints, the … (View Post)

I assumed that the system was already built, and that there was little to be done about the sizes of the individual zone sizes. Sure, as you reduce the head, you increase the flow. But what has that … (View Post)

Where I live, you cannot have a hot water boiler without a LWCO. My W-M Ultra 3 control unit is said to have the smarts that some jurisdictions consider a LWCO unnecessary, but my AHJ says I must hav… (View Post)