Boiler vs. Furnace for a North Shore Home Renovation

Two different jobs: heating the water, or heating the air

A furnace heats air directly, using a gas burner or electric element, and a blower fan pushes that hot air through metal or flex ducts to registers in each room. It's the most common heating system in North American homes built from the 1960s onward, and it can also handle central air conditioning through the same ducts, which is one reason it's popular.

A boiler heats water instead, and that hot water travels through pipes to baseboard radiators, wall-mounted radiators, or radiant floor tubing, where it releases heat into the room. There's no fan and no air movement involved in the heat delivery itself. Older North Shore homes, particularly ones built before the 1980s, are more likely to have a boiler system with hydronic baseboards, since forced air with ductwork became the more common builder default from the 1970s onward.

Neither system is objectively better. They solve the same problem, heating a house, with different equipment, different comfort characteristics, and different retrofit implications for a renovation.

How they actually feel to live with

Hydronic heat is generally considered more even and comfortable, since it warms the room through radiant heat from the baseboard or floor rather than blowing air around. There's no forced-air noise, no draft near registers, and no dust or allergens getting circulated through ductwork the way forced air can. The tradeoff is that a boiler system alone has no built-in path to air conditioning or whole-house ventilation, since it never moves air in the first place.

Forced air responds faster, since moving hot air through a room heats it up more quickly than warming a baseboard and letting that warmth radiate out. It also gives you a ready-made path to central air conditioning and, on newer systems, better filtration and humidity control, since all of that runs through the same ducts already installed for heating.

On the North Shore, where summer cooling has become a bigger part of renovation conversations since the 2021 heat dome, this difference matters more than it used to. A house with existing ducts can add central air relatively easily. A hydronic house needs a separate ductless mini-split system or new ducts entirely to get any form of central cooling.

What it actually costs to convert from one system to the other

This is the number that surprises people, the way it surprised the Lynn Valley homeowner. Converting from hydronic to forced air, or forced air to hydronic, is not a heat source swap. It's a full distribution system replacement, since ducts and baseboard piping aren't interchangeable and one can't simply carry the other's output.

Why a full system conversion is rarely worth it on its own

In most cases we see, a full conversion from one system to the other is only worth doing as part of a larger renovation where walls, ceilings, and floors are already opening up for other reasons, a whole-home renovation or a major addition. Cutting into finished ceilings and walls purely to run new ductwork through a house that's otherwise untouched is expensive relative to the comfort gain, and there's usually a better answer for the specific problem the homeowner is trying to solve.

If the real goal is adding air conditioning to a hydronic house, a ductless mini-split system serving the main living areas is almost always cheaper and less invasive than converting the whole house to forced air. If the goal is quieter, more even heat in a forced-air house, adding hydronic radiant floor heat in specific rooms, like a primary bathroom or a basement, during a renovation there can deliver the comfort improvement without touching the whole house's heating system.

We walk this trade-off through with clients before pricing a full conversion, because the request usually starts from a comfort or cooling problem that has a more targeted, less expensive fix.

Heat pump compatibility: ducts make it simpler, but hydronic isn't excluded

A house with existing forced-air ductwork has a more direct path to a heat pump retrofit, since a ducted cold-climate heat pump can often use the existing duct system, sometimes with resizing or resealing, in place of the furnace. That's the more common and generally lower-cost heat pump retrofit path on the North Shore.

A hydronic house isn't excluded from heat pump conversion, but the path is different. Modern cold-climate heat pumps can supply low-temperature hot water suited to radiant floor heating, and some can be configured to supply lower-output hydronic baseboards, though standard baseboards were often sized for the higher water temperatures a boiler produces, meaning existing baseboards may need to be upsized or supplemented to deliver the same comfort at the lower temperature a heat pump runs efficiently at. Alternatively, a hydronic house can add ductless mini-splits as its primary heat pump path, leaving the boiler as backup or removing it entirely.

The house's existing distribution system, ducts or hydronic piping, is the single biggest factor in how straightforward and how expensive a heat pump retrofit will be. This is worth mapping out before committing to either a boiler or furnace replacement during a renovation, since the choice made now affects how the next heating upgrade goes.

BC Energy Step Code and what it means for either system

The BC Energy Step Code sets a performance-based energy standard for new construction and some major renovations, assessed through building modelling and, at higher steps, a blower door air-tightness test rather than a simple table of required equipment. Neither a boiler nor a furnace is automatically compliant or non-compliant under the Step Code; what matters is the whole house's modelled energy performance, which includes the heating system's efficiency alongside insulation, air tightness, and window performance.

That said, the Step Code's direction of travel favours electrification, and a heat pump, whether paired with ducts or hydronic distribution, generally performs better in a Step Code energy model than a gas furnace or gas boiler, since it moves heat rather than generating it directly from combustion. If your renovation triggers a Step Code requirement, which municipalities decide based on project scope and permit value, this is worth discussing with your energy advisor before locking in a system replacement, since the modelled outcome affects which system choice gets you to the required step most cost-effectively.

Municipalities set their own Step Code timelines and thresholds, so confirm with the City or District of North Vancouver, or West Vancouver, whether your specific renovation scope triggers a Step Code energy requirement before finalizing a heating system decision.