First: Is It Actually the Boiler?
Before assuming the worst, confirm the water is coming from the boiler itself and not a nearby source. In many Lower Mainland homes the boiler shares a mechanical room with the hot water tank, water softener, washing machine drain, and supply lines. Condensation dripping off cold copper pipes during a damp Vancouver winter can look like a leak but is completely harmless.
Wipe the unit and the floor dry, lay down a sheet of paper towel or cardboard, and watch where fresh water reappears. If it consistently returns directly under the boiler, the casing, or the pipe fittings attached to it, you very likely have a genuine boiler leak that needs attention.
Safety first: if you smell gas (a rotten-egg odour) or your carbon monoxide alarm is sounding, do not investigate. Leave the home immediately, then call FortisBC at 1-800-663-9911 or 911 from outside, and call us at 604-359-1081 once you are safe.
The Most Common Causes of a Leaking Boiler
1. High system pressure. When pressure climbs above roughly 2.5–3 bar, the pressure relief valve (PRV) opens and discharges water to protect the boiler. This is the single most common reason a boiler appears to leak. The leak is a symptom — the real culprit is usually a failed expansion vessel or an overfilled system.
2. A failing pressure relief valve. PRVs wear out. Once the internal seat is scaled or damaged, the valve weeps continuously even at normal pressure.
3. Corroded pipework or fittings. Metro Vancouver's soft, slightly acidic water slowly corrodes connections over years. Pinhole leaks at threaded joints, the pump, or the diverter valve are common in boilers 10+ years old.
4. A breached heat exchanger. This is the most serious cause. A cracked or corroded heat exchanger leaks internally and is often uneconomical to repair in an older unit.
5. Loose or perished seals and gaskets. Auto air vents, pump head gaskets, and union seals all degrade with heat cycling and can drip.
What You Can Safely Check Yourself
Start with the pressure gauge on the front of the boiler. A healthy cold system usually reads between 1.0 and 1.5 bar. If it is sitting above 2.5 bar, high pressure is the likely cause and the relief valve may be doing its job.
Next, look at the copper or plastic discharge pipe that exits the building (often terminating outside near the boiler). If water is trickling from there, the PRV has lifted. Take a photo of the gauge reading and the discharge pipe — it helps our technician diagnose faster over the phone.
Locate the filling loop (a small braided silver hose with one or two valves). Confirm both valves are fully closed. A filling loop accidentally left cracked open will slowly over-pressurise the system and force water out of the relief valve.
What you should not do: never attempt to dismantle the heat exchanger, the gas valve, or any sealed combustion component. Those are work for a licensed gas fitter under BC's Gas Safety Regulation.
Repairs and Costs in BC
The right fix depends entirely on the source. Replacing a worn pressure relief valve or an auto air vent is a relatively quick job. Recharging or replacing an expansion vessel is moderate. Re-sealing a corroded fitting or replacing a leaking pump is variable depending on access. A failed heat exchanger in an older boiler frequently tips the decision toward replacement rather than repair.
Because every leak is different — and because parts pricing on brands like Navien, Viessmann, IBC, and Rinnai varies — we quote on inspection rather than guessing. Repairs typically fall within a modest range for valve and seal work, rising for pump and expansion vessel work, with heat exchanger issues being the most significant. Call 604-359-1081 for an exact quote after a proper diagnosis.
Leaving a leak unattended is a false economy. Even a slow drip drops system pressure, allows fresh oxygenated water in (which accelerates internal corrosion), and can damage flooring, drywall, and electrical components nearby.
When to Call a Professional
Call us right away if water is actively pooling, if the pressure gauge keeps climbing, if you see rust-coloured water, or if the boiler has locked out and won't fire. These point to faults that need a Red Seal gas fitter, not a DIY fix.
GasBoilers.ca is a CanroHeat Division serving Greater Vancouver — Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Shore and beyond. We diagnose the true source of the leak, fix what's economical to fix, and give you honest advice when replacement is the smarter call. Reach our team at 604-359-1081 to book a leak diagnosis.