We have an old radiant heating system that has hot water running through copper piping in the walls.
We recently had one of the pumps give out, so we replaced it after we drained the system. After replacing it, we refilled the system, but somehow air got in the lines. Is there any way to purge the air without having to purge all the water again?
Also, does the water fill valve to the system need to be open all the time while the system operates?
Thanks, I appreciate the help.