Blocked Microbore

In the world of central heating, "microbore" refers to a specific type of pipework characterized by its small diameter—typically 8mm, 10mm, or 12mm. While this piping was incredibly popular in the 1970s and 1980s due to its ease of installation and aesthetic benefits, it is notoriously susceptible to blockages.

High pressure? → Bypass column → Pressure still high? Blockage in system (tubing/injector/detector) → Pressure normal? Blocked column or column frit

Homeowners often mistake a blockage for a broken boiler or a faulty pump. Key indicators of blocked microbore include: blocked microbore

Here’s a concise breakdown of what it means, the common causes, symptoms, and how to fix it.

A blocked microbore system is a common cause of cold radiators and inefficient heating. This write-up explores the mechanics of microbore, why it blocks, how to identify the issue, and the methods used to resolve it. In the world of central heating, "microbore" refers

To prevent recurrence, engineers often install a magnetic filter (like a MagnaClean) on the return pipe near the boiler. This filter catches sludge particles before they can circulate back into the microbore pipes.

A blockage in these narrow pipes restricts water flow, leading to several tell-tale symptoms: → Bypass column → Pressure still high

A system is a common headache for homeowners with central heating installed between the 1970s and 1990s . While microbore piping (typically 8mm or 10mm in diameter) was originally popular for its flexibility and ease of installation, its narrow pathways make it uniquely vulnerable to debris and sludge. Identifying a Blocked Microbore System

Fixing a blocked microbore system is often more difficult than fixing a standard system because traditional methods can damage the pipes.

: The entire system takes much longer than usual to reach temperature.

The very feature that defines microbore—its narrow diameter—is its Achilles' heel. The internal volume of a 10mm pipe is significantly less than that of a 15mm pipe. Consequently, it takes much less debris to cause a complete obstruction.