Learn why an underfloor heating pump may be running while the floor remains cold. This article explains low flow, air locks, blocked filters, valve issues, unbalanced loops, wrong pump head, and pump selection problems.
Why is underfloor heating cold even when the circulation pump is running?
Underfloor heating can stay cold even when the circulation pump is running because the system may not have enough flow. Common causes include trapped air, blocked filters, closed valves, unbalanced loops, insufficient pump head, incorrect pump speed, or wrong pump selection.
For small residential underfloor heating or heating circulation, AIKON CMS(L)25-6T1M-I can be considered as a reference model with max flow 55 L/min, max head 6 m, and DN25 threaded connection. Final selection should be confirmed by actual flow, head, loop length, water temperature, voltage, and installation conditions.
