Technophile
New Member
Hello! We have a hydronic heating system that appears (to my admittedly inexperienced eyes) to have some design and installation errors (no filter, expansion tanks undersized and upside down, air eliminator in the heating return instead of between the boiler and circ pump, ...). I would appreciate help in understanding what I am doing before making any changes.
One big question is, are the circulation pumps on at the right times or did they swap the connections?
In the photo, the (Buderus GB142-24) boiler is just out of the frame, above. The storage tank is off to the left.
What confuses me is:
One big question is, are the circulation pumps on at the right times or did they swap the connections?
In the photo, the (Buderus GB142-24) boiler is just out of the frame, above. The storage tank is off to the left.
- The black pump at right flows up, and is constantly on.
- The red pump feeds the storage tank (outside of photo at left), with return plumbed to tee in at top right, just below the boiler intake. This pump only seems to run when the boiler is running (and perhaps while cooling down).
- The bottom horizontal pipe is heating return, flow is due to per-branch circ pumps outside the photo.
- The pipe above it is hot water to heating, separate circ pumps for each branch, outside the photo.
What confuses me is:
- Why circulate through the boiler all the time? Looks like this connects the flow circuits?
- When the boiler is off, the red pump is off. How does heat get from the storage tank to the heating circuit? There's no check-valve on that pump. Will there be enough circulation through it driven by the black pump?
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