- Joined
- Jun 24, 2025
- Messages
- 1
Long time lurker, 1st time poster! Hydronic system (Espar) on my boat air in hydronic system driving me nuts! 3/4" line about 30' through multiple "radiators". I have vents at each. Air in system that I am unable to remove, as best i can tell air ends up at the top of the expansion tank but I see it start to push out the clear tube towards the reservoir tank but never makes it. This eventually causes the internal pump to cavitate, release bleed screw on top of the pump releases steam, pump catches and good for a few minutes. I've done this literally 100's of times thinking eventually all air will be purged out. I'm at a loss how to proceed, manufacturer is a lost cause.
