Rob R. wrote:Why do you run the primary circulator all the time?
Why not to - or why should you - It depends
I have wired larger systems to run 24/7 and smaller ones that don't. If you wire so the primary loop rests when the load is not calling for heat, there is a better chance the boiler(s) will not be exposed to parasitic ghost flow [energy drain- waste in even the best system piping.
If the loop is always charged with energy flowing liquid - reaction and mixing will be quicker and better balanced
but I have a burr in my saddle today so Ill just go lay by my dish now!