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humor me - hydronic w/oil boiler piping

ronron Posts: 137Member
got a new wgo3 installed few years ago, was interested in understanding everything and sorta did, forgot about it, need to replace a couple 20 year valves on zone return side and interested again in the whole setup...

is there a single answer that is the most ideal piping for
  • an oil fired water boiler that does NOT have a tankless coil
  • supplying 2 heat zones (the first floor above and the second floor above in a 2 story house)
  • baseboard radiator heating
  • and accommodating a 45 gal indirect water heater for domestic hot water
would appreciate any pic of such design assuming something answering something like this isn't taking food out of a working man's mouth. I read about & understanding pumping away from expansion tank, just read about primary/secondary loops, would like to further understand stuff like bullheading, hydraulic separation, other fancy terms...

is there any kind of building code or best practice or bad practice when circulator pumps and other hydronic related equipment are mounted to the wall behind a boiler where the boiler is typically positioned about a foot out from that wall?

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