A slow drip inside a Coquitlam mechanical closet, right where the radiant loops all come together, usually means the manifold needs a look.
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Quick answer
Radiant manifold repair or replacement on a boiler-fed hydronic floor system generally falls within CANRO's boiler repair ballpark of $250-$1,800, with most jobs landing around $400-$900, plus the $90-$150 service-call fee credited toward the repair and $95-$165/hour labour for the visit. This is a 2026 public-market ballpark, not a fixed quote -- CANRO's certified gas technicians confirm the real number once they've seen which part of the manifold assembly actually needs attention.
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A radiant manifold is the distribution point where a single boiler supply and return connect out to multiple individual radiant floor loops, each one typically feeding a different room or zone of in-floor heating tubing. It usually includes balancing valves or flow meters for each loop so a technician can adjust how much water flows to each area, along with air vents and sometimes isolation valves to allow individual loops to be shut off for repair without draining the whole system.
Manifolds are typically modular, built from multiple sections and individual valves rather than one solid casting, which means a technician can often replace just the specific failed valve, fitting, or air vent rather than the entire assembly. Full manifold replacement becomes necessary mainly when the main body itself is cracked, when it's an older undersized unit that can't properly serve the number of loops connected to it, or when corrosion has affected multiple components across the assembly at once.
| 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 |
Manifold repairs are generally contained, affordable fixes that don't reflect on the boiler itself, since the manifold is purely a distribution accessory on the radiant side of the system. Full manifold replacement is worth considering over patching individual failing components when a manifold is clearly undersized for the number of loops it's serving or when multiple parts across the assembly are failing in succession, since at that point ongoing piecemeal repairs may cost more over time than addressing the whole assembly at once.
Radiant floor heating fed by a gas boiler has become a common feature in larger newer homes on Burke Mountain and Westwood Plateau, where multiple zones, main floor, upper floor, and sometimes a basement suite, each run their own loop back to a central manifold. Homes with a laneway suite or basement rental unit added to the radiant system after the original install sometimes end up with a manifold that's been pushed beyond its original zone capacity, which is worth a technician evaluating if balancing has become difficult across the whole system.
Safety note
A radiant manifold connects directly to a gas-fired boiler's hydronic loop, so draining, repairing, or replacing it should be handled by a Technical Safety BC licensed gas fitter to keep the whole system operating safely. 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 balancing valve on that specific loop's manifold connection may have drifted or stuck, which a technician can usually adjust or replace without touching the rest of the manifold.
Often yes, since manifolds are typically modular, allowing a technician to replace just the specific failed valve or fitting rather than the entire unit.
It depends on the specific manifold's size and design, and a home that's added zones over time, such as a converted basement suite, can eventually outgrow its original manifold's capacity.
Periodic checking of balancing valves and air vents as part of an annual boiler service helps catch small issues before they become leaks or zone imbalances.
It comes up periodically, particularly as systems age or as households add zones beyond what the manifold was originally sized for.
A slow leak at the manifold itself is typically contained to the mechanical room where the manifold is located, rather than the floor tubing, but it's still worth fixing promptly to avoid water damage in that space.
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