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Cold Radiators and boiler short cycles
I just bought a 3 family house in Massachusetts. The radiators running off of 1.5"mains always get hot. The radiators off the 2.5" mains are always cold. The boiler runs, pipes going to second floor get hot, 1.5" main radiators get hot, but the ones off the 2.5" main barely get hot. Thermostat is set at 70F. Whenever we set it at 72F, then the radiators get somewhat hot but not as hot as the radiators off the 1.5" main. Is that normal? Do I just have to run the system at a higher temperature just to heat up the other radiators? Our second floor is vacant and it feels cooler up there. I'm concerned that we'll have to run the system at a higher temperature just to heat that second floor. The third floor is a small apartment and it only has a single radiator.
The other issue we have is how often the boiler runs for. I have noticed at night that the boiler starts and runs for about 6 minutes. Stays off for about 6 minutes and then restarts again for another 6 minutes. The TStat is set to 70F but it never drops below or rises above 70F. Only the radiators off the 1.5" main stay warm. The others remain cold. The TStat is located on a wall between the 2 rooms with the radiators off the 2.5" mains. Any tips and recommendations?
Most of the pipes in the basement arent insulated except for a few small sections that still has asbestos insulation.