Microbore Central Heating Problems Jun 2026

Microbore copper pipes have thinner walls than standard heating pipe (often 0.6mm vs 0.8mm for 15mm pipe).

Because the pipes are so narrow, the resistance to water flow (hydraulic resistance) is high. The boiler pump has to work incredibly hard to push water through the system. microbore central heating problems

The most common and serious problem is the buildup of magnetite (black iron oxide sludge) inside the narrow pipes. Microbore copper pipes have thinner walls than standard

The most common complaint is radiators that refuse to get hot, or which are hot at the top but cold at the bottom. microbore central heating problems