"Underfloor heating systems need bleeding because air can get into the pipework over time. This is more common in wet underfloor heating systems, which pump water through pipes in your floors to warm them up."
"Air can prevent your underfloor heating from working efficiently because it stops the water from circulating properly through the pipework. Areas of your floor that aren't warming up can indicate a problem."
"Gurgling or bubbling sounds are a sign of air in the pipework. If your system is taking longer to heat up than usual, it could be down to trapped air needing bleeding."
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