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3 questions

remodel
remodel Member Posts: 68
in THE MAIN WALL
1) Is it worth it to put in a smaller boiler pump and smaller system pump?  Boiler a loch 155.  Right now I have about 8gpm to the system and 8gpm to boiler all zones calling.  One zone calling I have 4 gpm -5gpm to system and 8 gpm at boiler.  At 30%-50% fire boiler DT good, at 20%  - 7 degree DT.  System oversized by 25% so might be a moot point. 

2) Can I put cast iron rad/panel rads in place of fin tube BB at the end of my series loop or will I rob too much heat?  I would have to pipe it in series and this loop has one FCU off of monoflows right after rad replacement.  The remove and replace is about 50%-60% of the 1st floor emitter length.  

3) Is negative DT alright at start-up?   

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