If there is too much heat and pressure in the system your PRV will open and let out the pressure. You could always run the extra heat through a baseboard or into a tub so the PRV doesn't blow off. I also wouldn't suggest making a loop unless you really know what you're doing. There are several companies that sell coils ready made.
Last edited by traderfjp
on Mon Feb 04, 2008 7:04 pm, edited 1 time in total.