Rob R. wrote:
Didn't you install valves so you can balance the flow to the radiators?
If your home has a lot of radiation, run the boiler at a lower temperature and circulate longer.
I ran an indirect return loop, I think it's called, which is supposed to self balance if the radiators are similar in size. I'm assuming at this point that the size of the LR radiators is what caused the lack of flow through them, but I'm not one hundred percent sure (I'll be able to check that theory when the upstairs is wired in, because all the rads up there are the same size). I needed, adding the balancing valves will be a snap with the PEX.
As for running the boiler at lower temperatures, I''m actively considering that. I need a minumum temp for the boiler for the DHW, and that means I wont be able to run the heat through the rads continuously (~28k heat loss, at 120f boiler temp I can put out 49k through the rads). I'll be playing around with the boiler temp this winter, and I'm hoping I can keep it around 140LL and 160HL. If it holds temp as well as it did this weekend, I may even drop the LL down to 135.