New construction in Clayton Heights often includes in-floor radiant zones off a high-efficiency boiler, and CANRO explains how to keep that setup running well.
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Quick answer
Newer Clayton Heights homes often use a combination hydronic system, a high-efficiency condensing boiler feeding both in-floor radiant zones and baseboard or fan-coil heating, sometimes alongside domestic hot water. Keeping a system like that reliable depends heavily on proper initial commissioning and on catching controls or condensate issues early.
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Because most homes in Clayton Heights were built within the last two decades, the hydronic systems here tend to be more integrated than what you would find in an older neighbourhood: a single high-efficiency condensing boiler often serves in-floor radiant tubing in tiled or lower-level spaces, baseboard or fan-coil heat elsewhere in the house, and sometimes an indirect tank for domestic hot water, all off one appliance. That design is efficient when it is set up correctly, but it also means more can go wrong across more subsystems if something is off.
When we get called to one of these newer systems, the first step is understanding exactly how it was configured, since not every installer sets up multi-zone systems the same way, and a manifold or mixing valve issue can look like a boiler problem to a homeowner even though the boiler itself is fine.
In-floor radiant heat under tile in a bathroom or lower level responds slowly by nature, so a homeowner sometimes calls concerned about a zone that is simply lagging behind a faster-responding baseboard zone rather than actually malfunctioning. We separate a genuine fault from normal radiant lag as part of the diagnosis.
A multi-zone system with radiant and baseboard heat off one boiler needs correct mixing valve settings so the radiant loop, which runs cooler water than baseboards typically need, does not run too hot or too cold. If a system was never properly commissioned at install, or if zones were added later without rebalancing the whole system, it can run inefficiently or unevenly for years without an obvious single point of failure.
| Symptom | Likely cause | Path forward |
|---|---|---|
| One radiant zone always cool | Mixing valve or manifold issue | Inspect and adjust that zone |
| Boiler locks out with an error code | Condensate line or sensor fault | Check condensate first, then sensors |
| Whole system feels underpowered | Original commissioning or zone balance | Full system rebalance |
| New zone added, older zones now uneven | System never rebalanced after addition | Rebalance across all zones |
Let us know if the system includes radiant floor zones, how many separate zones the home has, and whether any renovation added heating to a previously unheated space, since that history often explains symptoms that would otherwise look mysterious. If your boiler also handles domestic hot water through an indirect tank, mention that too, since a fault there can sometimes be confused with a space-heating problem.
Safety note
If you ever smell gas (a rotten-egg odour) or suspect a carbon monoxide problem, leave the home right away, do not flip switches or light anything, and call FortisBC at 1-800-663-9911 from outside before calling anyone else. Any gas connection, venting change, or pressure work on a boiler or water heater in BC must be done by a Technical Safety BC licensed gas fitter; CANRO carries gas licence LGA0043870 and boiler licence LBP0046450.
That is often normal behaviour for radiant floor heat, which responds more slowly than baseboard or fan-coil heat due to the thermal mass of the floor itself, rather than a sign of a fault.
Yes, since each zone typically has its own valve or manifold connection, a fault can be isolated to a single zone without affecting the rest of the house, which is one advantage of a multi-zone hydronic layout.
It is possible if both run through the same boiler and indirect tank setup, since a fault in one function can sometimes show symptoms in the other. A tech needs to trace which subsystem is actually at fault.
Often yes, adding a zone changes the flow dynamics across the whole system, and skipping a rebalance is a common reason previously fine zones start behaving unevenly afterward.
Signs of poor commissioning include zones that never quite reach temperature, uneven heat between rooms that never resolves, or a boiler that runs constantly without ever satisfying demand. A full inspection can confirm whether settings need adjusting.
Leave the house immediately and call FortisBC at 1-800-663-9911 from outside before doing anything else.
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