A cast-iron radiator that's finally rusted through at the base is a repair conversation many owners of older Coquitlam homes eventually have.
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Quick answer
Replacing a single radiator on a residential hydronic system generally falls within CANRO's boiler repair ballpark of $250-$1,800, with most work landing around $400-$900, plus the $90-$150 service-call fee credited toward the job and $95-$165/hour labour depending on how the radiator is plumbed in. That's a 2026 public-market ballpark, not a fixed quote -- radiator size, type, and access all affect the real price, which CANRO's certified gas technicians confirm after seeing the specific unit.
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Radiators themselves are simple, durable heat emitters with no moving parts, and cast-iron units in particular can last for decades of normal service. What ultimately ends a radiator's life is usually corrosion, either internal rust weakening the metal from years of water contact, or external corrosion at the connection points where fittings meet the radiator body. A crack or pinhole leak at either point means the individual unit needs to be replaced, since these leaks aren't something that can be reliably patched long-term.
When a single radiator in a multi-radiator system needs replacing, matching output capacity matters more than matching the exact style, since an undersized replacement will leave that room noticeably cooler than it used to be. A technician calculates the appropriate size based on the room and the existing system's water temperature rather than simply swapping in whatever fits the same footprint. Older homes with original cast-iron radiators sometimes have units that are no longer manufactured in the same style, in which case a modern panel radiator sized to match the original's heat output is a common practical solution.
| Item | Typical range |
|---|---|
| Diagnostic / service call (credited to repair) | $90-$150 |
| Labour, per hour | $95-$165 |
| Boiler repair bill, typical (most jobs) | $400-$900 |
| Boiler repair bill, full range | $250-$1,800 |
A radiator with a genuine leak at the body itself, rather than at a fitting, generally needs to be replaced rather than repaired, since welding or patching a leaking cast-iron radiator is rarely a durable long-term fix. A radiator that's simply not heating evenly due to internal sludge, on the other hand, can often be flushed or power-cleaned and put back into service without replacement, which is a meaningfully cheaper outcome worth trying first.
A number of Coquitlam's older homes, particularly in Central Coquitlam and around Como Lake, still have original cast-iron radiators from decades ago, and it's common for one or two units to reach the end of their service life well before the rest of the system does, since individual radiators can corrode at different rates depending on local water flow and exposure. Replacing just the failing unit while leaving the rest of a functioning system in place is usually the practical approach rather than treating it as a signal the whole heating system needs an overhaul.
Safety note
Radiator work connects directly to a gas boiler's hydronic loop, so isolating, draining, and reconnecting the system should be handled by a Technical Safety BC licensed gas fitter. CANRO holds gas licence LGA0043870 and boiler licence LBP0046450. If you ever smell gas near the boiler, leave the home and call FortisBC at 1-800-663-9911.
A leak at a fitting can sometimes be resealed, but a crack or pinhole in the radiator body itself generally means the unit needs to be replaced rather than patched long-term.
Uneven heating across the radiator often points to internal sludge that can be flushed out, while an active drip or visible corrosion at the body points toward replacement being the more reliable fix.
Not always exactly, since some original styles are no longer manufactured, but a technician can size a modern replacement to match the heat output of the room it's serving.
Yes -- individual radiators in a multi-unit system often reach the end of their service life at different times, so replacing just the failing one is a normal, practical approach.
A single radiator swap generally doesn't affect the rest of the system's operation, provided the replacement is correctly sized to match the original unit's heat output.
There's no fixed lifespan, but many original units in older homes have run for several decades, with individual failures usually tied to localized corrosion rather than age alone.
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