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Main venting and balancing
So my heating in my 2 story home is not well balanced and trying to figure out how to go about this. I have 3 2inch mains, single pipe system. Shortest main is 20’ long and has 2 Gorton #1’s, next main is 52’ long and has 1 big mouth, last main is 62’ long and has 2 big mouths on it.
The shortest main heats up and vents close fast (approx 10-12mins) and the rads get hot very quickly. The mid length main takes approx 15mins longer to heat up, and the longest main vent takes another 10-15 or so mins on top of that. The last rad on longest main is in master bedroom on 2nd floor and it has a Gorton D on the rad to try and get it hot faster up there before thermostat is satisfied and shuts off. I have to turn the thermostat temp up to give enough time to get heat in my room and it shouldn’t have to take that long. By that time it is sweltering hot on main floor.
Any suggestions on adding more main venting to longer mains and/or using just 1 Gorton #1 on short main instead of 2 since it heats way faster than longer mains?
Also what kind of vents do you recommend or like for radiators? I have a mix between gortons, vari vents, and some really old bottle looking vents.
Any suggestions and help is much appreciated.