Microbore restricts the volume of hot water that can travel through the system. This creates a "bottleneck" effect if you try to upgrade to larger or double-panel radiators. The small pipes simply cannot deliver enough hot water to fill larger radiators efficiently, leaving them lukewarm.
While it offers fast heat-up times and is easier to hide under floorboards, microbore is widely considered by modern heating engineers to be "high maintenance." It is significantly more prone to blockages, difficult to repair, and incompatible with many modern high-efficiency boilers. problems with microbore central heating
If you are buying a house with microbore central heating, budget £3,000–£5,000 for a complete repipe to 15mm. Many homeowners live with microbore for decades, but the moment a boiler fails or a blockage occurs, the "cheap" repair bill quickly exceeds the cost of replacement. Microbore restricts the volume of hot water that
I can then provide a tailored troubleshooting guide or a cost estimate for upgrades. While it offers fast heat-up times and is
Maintaining a microbore system is notoriously difficult.