Microbore systems are magnets for air pockets. Because the pipes are thin and often routed with many bends and "dips" through floor joists, air bubbles become easily trapped. Unlike larger pipes where the force of the water can often push air through to a vent, microbore pipes frequently suffer from stubborn air locks that are notoriously difficult to shift. These locks prevent hot water from reaching specific radiators, leaving parts of the home freezing even when the boiler is running at full capacity. Low Tolerance for Modern Boilers
Maintaining a microbore system is notoriously difficult. problems with microbore central heating
If you'd like to explore solutions for your specific system, let me know: The ? Which specific rooms are staying cold? Microbore systems are magnets for air pockets
It isn't all bad. Microbore does have some distinct advantages, which is why it was installed in the first place: These locks prevent hot water from reaching specific
Microbore central heating systems use small-diameter copper piping, typically 8mm or 10mm, rather than the standard 15mm or 22mm pipes found in traditional installations. Popularized in the 1970s and 80s for their ease of installation and lower material costs, these systems are now notorious for specific technical failures. If your home relies on these narrow tubes, understanding the inherent problems is essential for long-term maintenance and efficiency. Chronic Blockages and Sludge Build-up
The internal diameter of microbore is very small (e.g., 6mm = pencil lead thickness).