West Vancouver's larger hillside estates often run a GB162 across radiant floors and radiators together, and that mix complicates diagnosis.
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Quick answer
A Buderus GB162 in a West Vancouver hillside home that's heating unevenly across a mixed system of radiant floors and radiators is usually a zone-control or flow-balancing issue rather than a boiler defect. These larger, more complex multi-zone estates need a methodical zone-by-zone check rather than a single quick test. Once the specific zone or control fault is isolated, the repair itself is generally straightforward.
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West Vancouver's larger properties, particularly in the British Properties and other hillside neighbourhoods, often have hydronic systems that were expanded or updated over the decades, sometimes combining original radiators with a later radiant floor addition, all run off the same GB162. Radiant floor loops and cast-iron radiators have very different flow and temperature needs, and when they're mixed on one system, a control or balancing valve that's drifted out of adjustment can leave one zone type undersupplied while the other runs fine, which looks like a boiler problem but usually isn't.
| Symptom | Likely cause | Where we look |
|---|---|---|
| Radiant floors cool, radiators fine (or vice versa) | Zone balancing or mixing valve drift | Balancing valves and any mixing valve for the radiant loop |
| Whole system underperforms evenly | Boiler-side ignition or flow issue | Boiler diagnostics first |
| One specific room or wing cold | Zone valve or circulator on that branch | That zone's controls specifically |
| Boiler cycles fine, distribution is the issue | Confirms a zone-side, not boiler-side, fault | Zone-by-zone flow check |
If you know your home has both radiant floor heating and traditional radiators, mention that when you book, since it changes how we approach the diagnosis from the start. Note which specific areas feel cooler than others rather than describing the whole house as cold, since that detail narrows things considerably on a multi-zone system. Access on steep private driveways can also affect timing, so let us know if there's a gate code or limited parking.
On a property with both radiant floors and radiators, it's worth having the mixing valve and zone balance checked annually rather than only when a specific area goes cold, since a valve that's drifted slightly can undersupply one zone for a while before it becomes obvious. This is particularly worth building into a maintenance routine on a larger home where a cool room might simply be assumed to be less used rather than flagged as a system issue.
The diagnostic visit is $90 to $150, credited toward the repair, with labour at $95 to $165 an hour, though larger multi-zone systems can take longer to fully diagnose. Once isolated, most individual repairs still land in the $250 to $1,800 range, typically $400 to $900. This is a 2026 public-market ballpark, not a quote; CANRO's technician confirms the actual cost after seeing the full system layout.
Safety note
Treat a gas odour, a tripped CO alarm, or scorch marks near the flue as a leave-now situation: get out, then call FortisBC's 24-hour line at 1-800-663-9911 before anyone goes back in. A licensed gas fitter should clear the home before the boiler runs again.
Yes, this is a common and workable setup, but it usually needs a mixing valve to supply the radiant loop at a lower temperature than the radiators need, and that valve is a common point of drift over time.
If the mixing valve serving that zone has drifted or failed, the radiant loop can end up underheated even while the rest of the system, including any radiators, performs normally.
Yes, we regularly service larger hillside and waterfront properties throughout West Vancouver, including systems with multiple heating zones and mixed radiant and radiator distribution.
A more complex multi-zone system can take somewhat longer to fully trace, which factors into labour time, but the underlying repair itself is usually a standard part or adjustment once isolated.
On some West Vancouver properties, yes. Steep private driveways, gated entries, or a mechanical room a level below grade can all affect how a visit is scheduled, so it's helpful to flag any of that in advance.
Somewhat, yes, since there's an extra component, the mixing valve, that a simpler single-distribution system doesn't have, and it's worth including in your annual service checklist specifically.
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