Arbutus Ridge's character homes often keep original radiators while adding radiant floor zones in renovated spaces, and CANRO plans that mix carefully.
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In Arbutus Ridge, hydronic heating planning usually centres on how to integrate a renovation-era radiant floor zone with a character home's original cast-iron radiators, sizing a single boiler to serve both without one zone starving the other. A technician calculates heat loss for the original portion of the house separately from any addition before finalizing how many zones and how much boiler capacity the whole system needs.
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Arbutus Ridge's character homes, mostly built from the 1930s through the 1960s, frequently still have their original cast-iron radiator distribution, and many owners who renovate a kitchen or add a family room choose to install radiant floor heat in the new space rather than extending radiator piping into it. That creates a single boiler serving two distinct types of distribution, radiators in the original rooms and radiant tubing in the addition, and getting the balance right means the boiler and its controls need to prioritize and modulate between zones with genuinely different flow and temperature requirements.
Radiant floor tubing generally runs at a lower water temperature than radiators need to put out comparable heat, so the system usually needs a mixing valve or similar control to deliver the right temperature to each zone rather than sending the same hot water straight to both.
Undersizing is a common problem when a radiant zone gets added to a home with an older, already-sized boiler, since the original unit was calculated for the radiators alone. A technician recalculates total heat loss across both the original rooms and the new addition, factoring in that Vancouver's older character homes on the westside often have decent original wall construction but sometimes underperforming attic insulation or single-glazed original windows in rooms that haven't been updated.
| System Component | Original Radiators | New Radiant Floor Zone |
|---|---|---|
| Typical water temperature | Higher | Lower, needs mixing valve |
| Response time | Faster to feel warm | Slower, more thermal mass |
| Zoning approach | Often whole-floor or whole-house | Room- or area-specific |
| Boiler sizing impact | Established baseline load | Additional load, recalculate total |
When we replace a boiler that's being asked to serve both an addition's radiant zone and the home's original radiators, the project usually includes a mixing valve or similar temperature-control device, verification that existing radiator piping is in good enough condition to keep in service, and confirmation that the new boiler's output matches the recalculated total load rather than just the original radiator-only sizing. A project like this typically runs in a ballpark of $6,500 to $14,000 or more, and that is a ballpark, not a quote, since the scope depends heavily on how the addition's zone was originally piped.
If your radiant floor addition already feels cooler than the rest of the house, that's often a sign the original boiler was never actually sized to include it, which is worth confirming before assuming a component has failed.
Safety note
If you ever smell gas, hear hissing near the boiler or water heater, or notice soot, a yellow burner flame, or a headachy, stale feeling near the mechanical room, leave the house and call FortisBC at 1-800-663-9911 from somewhere safe before doing anything else. Gas piping, venting, and combustion appliances must only be serviced or altered by a Technical Safety BC licensed gas fitter.
Yes, this is a common setup in character homes, but it usually needs a mixing valve or similar control since radiant floors run at lower water temperatures than radiators typically need.
This often means the original boiler was sized only for the existing radiators and wasn't recalculated to include the new zone's added load, which is worth confirming with a technician.
Usually not directly, though the piping should be checked for condition, since the whole system's performance depends on both zones working correctly.
A technician looks at wall construction, attic insulation, and window condition room by room, since older homes can have uneven performance between original rooms and updated additions.
It blends hot boiler water down to the lower temperature radiant floors need, while still sending full-temperature water to radiators, so both zones get what they actually require.
Yes, if your household size or usage has changed since the original system was installed, it's a good time to confirm domestic hot water capacity is still adequate.
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