A guide to gas-fired hydronic heating in North Vancouver's Upper Lonsdale, from original cast-iron radiators to newer radiant additions.
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Hydronic heating uses a gas boiler to circulate hot water through radiators, baseboards, or in-floor tubing rather than forced air through ducts. Upper Lonsdale has a notable number of older character homes still running original cast-iron radiators alongside newer custom builds that use in-floor radiant heat, and both approaches work well here as long as the boiler and controls are properly matched to the distribution system in place.
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A good number of Upper Lonsdale's older homes still have their original cast-iron radiators, which were built to last and often remain in excellent working order decades after installation, even when the boiler feeding them has been replaced more than once. These radiators are slow to heat and slow to cool, which some homeowners actually prefer for the steady, even warmth compared with forced air's quicker but less consistent cycling.
Newer custom builds on the upper slope, meanwhile, more often use in-floor radiant heat on lower levels or in additions, paired with the same style of gas boiler as the source. Both distribution methods run off the same basic boiler-and-circulator setup, just with different water temperatures and zoning approaches.
A radiator that's cold at the top and warm at the bottom almost always means trapped air needs bleeding, which is a simple homeowner-accessible fix using the small valve at the top of most radiators. Original piping that's decades old occasionally develops a slow weep at a joint, which shows up as gradually dropping system pressure rather than a dramatic leak.
In homes where a radiant addition was tied into an existing radiator-based boiler, a miscalibrated or failed mixing valve is a common culprit if the new zone runs too hot or too cool relative to what the thermostat calls for — this is a targeted repair rather than a system-wide problem.
An annual service checking combustion, pressure, and the condition of circulator pumps and valves is the baseline for any hydronic system, and in older homes it's worth having the technician also check radiator valves and visible piping for early signs of corrosion. Bleeding radiators once a year at the start of the heating season prevents most of the noise and uneven-heat complaints homeowners notice.
When an aging boiler eventually needs replacing, the original cast-iron radiators or existing radiant tubing can almost always be reconnected to a new, more efficient unit rather than replaced themselves. Ballpark, not a quote: a boiler replacement here typically runs $7,500–$15,000+ depending on output and any venting changes, confirmed after an in-home assessment.
Safety note
If you smell gas or suspect a carbon monoxide problem, leave the home immediately and call FortisBC at 1-800-663-9911 from outside before doing anything else. Never try to relight a pilot or reset a gas appliance yourself if you smell gas.
In most cases, yes — cast-iron radiators are durable and often outlast several boilers, so reconnecting them to a new, efficient boiler is usually more practical than replacing radiators that are still functioning well.
That's a classic sign of trapped air, which blocks hot water from filling the top of the radiator. Bleeding it with the small valve typically found at the top resolves the issue quickly.
Yes, a licensed installer can often add a radiant zone off the existing boiler using a mixing valve to supply the cooler water temperature radiant floors need, as long as the boiler has adequate capacity.
A system pressure gauge that needs topping up more often than it used to is usually the first sign, sometimes before any visible leak appears. A technician can pressure-test the system to locate the source.
Yes, hydronic systems scale well with zoning, allowing different levels or wings of a larger home to be heated independently, which suits the varied layouts common among Upper Lonsdale's newer custom builds.
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