On a large West Vancouver property, a detached carriage house is generally better served by its own compact boiler than by extending hydronic piping from the main house across the yard, since long buried runs lose heat and complicate future repairs.
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West Vancouver's bigger hillside lots, particularly around the British Properties and Caulfeild, have room for a detached carriage house behind the main residence, often replacing what used to be a garage or workshop. Heating one of these secondary structures raises a genuinely different question than heating an attached suite: is it worth running heat from the main house, or does the carriage house need its own system?
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Running hydronic piping underground from a main house boiler to a detached structure means trenching across the yard, insulating the buried line to prevent heat loss, and accepting that any future leak in that buried run is expensive to locate and fix. A dedicated small boiler sized specifically for the carriage house's square footage avoids all of that, at the cost of running its own gas line instead, which is a comparatively simpler and more serviceable trench to dig.
Carriage houses are usually compact, often one or two bedrooms, so the boiler serving one doesn't need to be large. Sizing it correctly for the smaller footprint keeps both installed cost and ongoing operating cost reasonable relative to running a line from a larger central system.
| Factor | Dedicated small boiler in carriage house | Extend hydronic line from main house |
|---|---|---|
| Heat loss over distance | None, source is on-site | Buried line loses some heat over distance |
| Future serviceability | Straightforward, contained to one structure | A leak in a long buried run is harder to locate |
| Upfront trenching | Shorter run, usually just a gas line | Longer run, needs insulated hydronic piping |
| Independent temperature control | Full independent control | Possible with zoning, but tied to main system |
Equipment delivery to a carriage house on a steep West Vancouver lot can be more involved than a flat-lot install, particularly where a switchback driveway or a set of exterior stairs is the only route in. This is worth discussing with your technician ahead of time, since it can affect scheduling and, occasionally, which size or configuration of boiler is practical to carry in.
Safety note
If you ever smell gas, hear a hissing sound near the meter or appliance, or suspect a venting or carbon monoxide problem, leave the home immediately and call FortisBC at 1-800-663-9911 from a safe location. Do not attempt to relight a pilot, reset a unit, or investigate the smell yourself. Only a Technical Safety BC licensed gas fitter should open, adjust, or service gas piping, venting, or combustion components.
A dedicated small boiler in the carriage house is generally the more practical and serviceable option, since it avoids a long buried hydronic run across the yard that loses heat and is harder to repair if it fails.
Sizing depends on the structure's square footage and insulation level, not the size of the main house; a technician calculates heat loss specific to the carriage house before recommending a unit.
Not always; a branch line from the main house's existing service can work if there's spare capacity, but a dedicated meter is sometimes the more practical choice depending on distance and load.
It can add complexity on a steep lot with limited vehicle or equipment access, so it's worth flagging during the initial assessment so scheduling and unit size account for it.
Many started as garages or workshops with minimal insulation, so a heat loss calculation as part of the conversion is important to avoid undersizing the boiler for the finished, insulated space.
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