Is the attic rad on a separate zone? OR is the water cooling down before it gets to the last unit on the run? We can't see from this vantage point but you can do some troubleshooting of your own. If the water is cooling down before it gets to the last radiator then you need or volume from the pump. Either the pump is too week, or more likely, the runs are getting clogged. If you suspect this, then post back with more info. PS: I used to live at a house where I had to bleed the rads weekly to keep system functioning ideally. BTW, I don't know the best solution to a clogged system. keep warm|
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