Typical lifespan
Steel panel radiators often last a couple of decades or more, and well-maintained cast-iron radiators can last far longer. The biggest factor is the condition of the water inside: untreated water corrodes radiators from within.
Signs a radiator needs replacing
Consider replacing a radiator if you notice:
- Rust spots or bubbling on the surface
- Pinhole leaks or damp patches beneath it
- Cold areas that don't improve after cleaning
- Very dirty, dark water when bleeding
- Seized or leaking valves that keep failing
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Making radiators last
Keep inhibitor in the system water, fit a magnetic filter and have the system checked during the boiler service. Fix leaks promptly, as constant topping-up brings in fresh oxygen that speeds up corrosion.
