Posted by Harold Kestenholz - Hydronic Network on September 18, 2001 at 18:08:56:
In Reply to: PRESSURE posted by mike wood on September 18, 2001 at 12:07:51:
26 psig is the highest you want the pressure to be at 180F. As long as the pressure relief valve does not dump water, it can be acceptable. Another expansion tank added or a larger tank would make the pressure rise less.