What's involved converting a Hastings-Sunrise character home from a tank to a gas tankless water heater, including venting and suite considerations.
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Quick answer
Converting to tankless in a Hastings-Sunrise character home usually means routing new dedicated venting through a basement that was finished after the original build, checking gas line capacity, and — where a secondary suite or laneway home is present — deciding whether one larger unit or two separate units better serves the property's combined hot water demand.
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A lot of the tankless installs we do in Hastings-Sunrise come up alongside a basement suite or laneway home project. Adding a second household to a property that was designed for one significantly increases hot water demand, and an aging tank sized for the original single-family use often can't keep up. Tankless is one way to address that, though it isn't automatic — the household's actual simultaneous demand still needs to be calculated properly.
The other common trigger is simpler: an old tank fails or starts leaking, and the homeowner decides to switch technology rather than replace like-for-like while the mechanical room is already being worked on.
Hastings-Sunrise lots tend to be narrow, and side-yard clearances to neighbouring properties can be tight. Tankless units need dedicated intake/exhaust venting terminated at an exterior wall with specific clearances from windows, doors, and property lines, and on a narrow lot finding a compliant termination point sometimes takes more planning than in a wider-lot neighbourhood. In some cases the venting route ends up going through the roof instead of a side wall to meet clearance requirements.
Where a property has a main house and a basement or laneway suite, there are two common approaches: one larger tankless unit sized to cover both units' peak simultaneous demand, or two separate smaller units each dedicated to its own dwelling. Separate units give each household independent control and avoid one unit being undersized when both are drawing hot water at once, but cost more upfront and use two venting penetrations instead of one.
| Approach | Pros | Trade-offs |
|---|---|---|
| One larger shared unit | Single install, lower equipment cost | Both units compete for peak flow |
| Two separate units | Independent, no shared-demand risk | Higher cost, two venting runs |
A single tankless installation, including venting and any gas line adjustments, generally runs $3,500 to $7,500 in this region — a ballpark, not a quote — and adding a second unit for a suite roughly doubles the equipment and venting cost. A licensed gas fitter verifies gas pressure under full firing load, confirms venting clearances meet code for the specific lot layout, and, if two units are installed, confirms each is properly isolated so one unit's demand doesn't affect the other.
If a suite is being added, check with the municipality on separate metering or permit requirements for the secondary unit before installation, since that can affect scope.
Safety note
Any work on gas piping, the burner, the venting, or the combustion chamber must be done by a Technical Safety BC licensed gas fitter. If you ever smell gas (a rotten-egg odour) or suspect a carbon monoxide problem, leave the home immediately and call FortisBC's emergency line at 1-800-663-9911 from a safe location before calling anyone else.
It depends on combined demand. If both households might run hot water heavily at the same time, a separate unit avoids one competing with the other; if demand is lighter, one properly sized shared unit can work.
Sometimes, but clearance requirements from windows, doors, and property lines can be tight on narrow Hastings-Sunrise lots, and roof termination is sometimes used instead when side-wall clearance isn't available.
It depends on usage patterns and the unit's efficiency compared to what it replaces; no specific figure can be promised, and a licensed installer can discuss expected demand based on your household.
Installing a second dedicated unit typically takes a day or more depending on venting complexity and whether the gas line needs to be split or upsized to serve both units.
Often yes, mainly because it frees up floor space in what's usually a tight mechanical room, though the venting retrofit does add cost compared to new construction.
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