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Hot water heat piping layout
I am in the process of moving and replacing hot water heating pipes in a small property I own that has 3 apartments, each with its own gas boiler and separate hot water radiator heat. Each apartment has 4 radiators.
My access to the pipes is in the basement where the gas boilers are located and where the piping is up toward the ceiling. The main reason that I am doing this is so I can raise all of the pipes in the basement up higher to create more ceiling height. Most of the existing pipes are iron, but I will be replacing all of them with copper piping.
What I noticed is that the piping system layout for the 3 systems are all different. I found a website with examples of the different piping arrangements at:
One of the existing systems is set up as a one-pipe series loop with all baseboard heating unit fed in one continuous series. The second existing system is set up as monoflow hydronic system with each radiator teeing off of the same pipe. And the third existing system is set up as a two-pipe direct return system where each radiator gets a supply form the supply side pipe and then returns to a return side pipe.
When I do the new connections, I would like to do them in whatever way would be best. I'm sthinking either the two-pipe direct return or two-pipe reverse return setup (as shown on the above link) would be the best.
I can easily do the two-pipe direct return setup for all three systems. I am not sure I understand how I would do the two-pipe reverse return system since I can't quite visualize how I would do that in real life as compared to the schematic diagram.
Am I correct in assuming that either of the "two-pipe" systems shown on theabove website link would be better than either the one-pipe series or monoflow hydronic system?
Als, is there much of a difference between the two options for the "two-pipe" system in terms of performance and efficiency?