I've gotten plenty of good food for thought here recently, so I thought I would post another question.
My split level home [27 years old, mine for 18 months] has hot water baseboard heating in two zones, upstairs and downstairs.
For some reason, the upstairs zone is split in two - a large pipe [about 1"] leaves the boiler and passes unused through the centre of the house to the far end of the house where it splits into two pipes [about 3/4"], each of which goes to either side of the house for use in the baseboards before emptying back into the return side of the boiler.
Now, two of my brothers have brand new homes of approximately the same size as mine, both with hot water baseboards in two zones, upstairs and downstairs. Their upstairs lines are simply single pipes that go down one side of the upstairs and return on the other side.
Question - any insight as to why they would have gone with this split-version for piping my upstairs? The large pipe goes right under my kitchen and main living area in the middle of the house, and while there is no air in the system, it does give off a humming noise of sorts when the hot water is rushing towards the splitting point. If it is doable, I might consider eliminating this larger pipe and simply going with the outside lines. That would allow the hot water to go directly to the North side of my home first where it tends to be cooler [I'm on the east coast of Canada].
Thanks in advance for any input - I know nothing, so please feel free to explain in the simplest of terms!!!