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hey all,

I’ve just moved into a 1905 limestone with a fairly old hot-water boiler system (not steam heat), and recently fired it up. The radiators on the parlor level and garden level seem to be heating up nicely, but the ones on the top floor are merely luke warm. There is a single thermostat for the whole house on the parlor level. The resuslt of this is that the top floor is pretty cold while the parlor is comortable. Any solutions/suggestions? Does the system need to be flushed out? All the valves on all the radiators are wide open, so why are they different temperatures?