When your boiler, a device that heats water for central heating and hot water in homes. Also known as central heating system, it stops working, it’s rarely because the whole thing is dead. More often, it’s one or two boiler parts, individual components like thermostats, pumps, or valves that keep the system running that have failed. These parts wear out over time, get clogged, or get damaged by water pressure or corrosion. You don’t need to replace the entire boiler just because the pilot light won’t stay on or the radiators stay cold.
Common boiler parts, the mechanical and electronic components inside a heating system that break include the thermostat, circulation pump, pressure valve, ignition system, and heat exchanger. A faulty thermostat means your boiler doesn’t know when to turn on. A clogged pump stops hot water from reaching your radiators. A leaking pressure valve can drop the system pressure until the boiler locks out. And if your heat exchanger cracks, you’re looking at a major repair—or replacement. These aren’t guesswork issues. They show up in clear ways: no heat, strange noises, error codes on the display, or water pooling under the unit.
Many people think a plumber can fix any boiler problem. But not all plumbers are trained for gas boilers. Only gas boiler technicians, certified professionals licensed to work with gas heating systems should handle gas line connections, combustion checks, or flue inspections. Trying to fix these yourself can be dangerous. Even simple tasks like bleeding radiators or resetting the pressure need to be done right—otherwise, you risk airlocks, leaks, or system failure. The good news? Most boiler problems start small. A dirty filter, a tripped safety switch, or a loose wire can cause big symptoms. That’s why checking the basics first saves time and money.
Boiler parts are designed to last, but they don’t last forever. If your boiler is over 10 years old, worn-out parts become more common. Replacing a £50 pump might be smarter than replacing a £1,500 boiler—if the rest of the system is still solid. But if you’re replacing the same part twice in a year, it’s a sign the whole system is aging out. You’ll find posts below that walk you through how to spot a failing pump, what to do when your boiler shows an error code, and why a simple reset won’t fix a cracked heat exchanger. These aren’t theory guides. They’re real fixes from people who’ve been there. Whether you’re trying to diagnose the issue yourself or just want to know if your repair quote makes sense, the articles here give you the facts you need—no fluff, no jargon, just what works.
Replacing a boiler is expensive because it involves high-skill labor, safety compliance, system upgrades, permits, and quality parts-not just the unit itself. In Auckland, costs range from $5,000 to $12,000, but energy savings and reliability make it a smart long-term investment.
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