Air locks trapping in tight hydronic heating spaces
Hydronic heating layouts with restricted space often force awkward component placement, such as an expansion tank zig-zagging to the top or an air separator positioned too low. This traps air pockets in specific zones and leads to persistent heating failures.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1adding a second circulator pump
- 2Asking for community suggestions and recommendations before mounting and hooking up the system
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I'm afraid I'm going to have air locks again on that one zone with the way its currently set up”source ↗
“My only concern is that in the limited space i have, I tried putting the air separator below the water heater and the expansion tank zig/zags to the top where I feel like air could/will trap.”source ↗
Where this came up
People with this problem also raised
- 4Why do my pipes knock when multiple faucets are running?
- 3Can you service an HVAC system with leak seal in it?
- 3New HVAC unit won't heat and makes clicking sounds
- 2Why is water pooling inside my furnace?
- 10How do I use and maintain an oil heating system?
- 4Why is just one upstairs room so hot in the summer?