A Renfrew Vancouver Special with a basement suite can push a standard tank past its limit, and CANRO sizes and installs tankless systems for that combined demand.
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Quick answer
A tankless gas water heater in a Renfrew home needs a dedicated vent run to the exterior and, in most cases, an upsized gas line, and sizing has to account for both the upper home and any basement suite if they share the same unit. This combined demand is the main reason tankless comes up so often in this neighbourhood: a standard tank sized for a single household frequently cannot keep up once a suite is added, and continuous tankless output solves that in a way that simply installing a bigger tank sometimes cannot match.
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A basement suite in a Renfrew Vancouver Special often shares the main water heater with the upper unit, and when both a tenant and the homeowner's household are running showers, laundry, and dishes on overlapping schedules, a standard tank sized for one household can run out of hot water at exactly the times it matters most. Tankless solves this by providing continuous output rather than a fixed reserve, provided the unit is sized for the combined peak demand of both living spaces rather than just the upstairs.
For homes with two entirely separate systems already, one for the suite and one for upstairs, the calculation is simpler, since each unit only needs to cover its own household's demand.
Correct sizing requires understanding how many fixtures across both the main house and the suite could realistically run hot water at the same time, not just counting bathrooms. A morning where a suite tenant showers while someone upstairs runs the dishwasher and another shower is a realistic peak in this neighbourhood's housing pattern, and a technician sizes the unit to handle that combined load rather than the upstairs household alone.
| Scenario | Peak Demand Consideration | Sizing Approach |
|---|---|---|
| Shared system, suite + main house | Both may draw simultaneously | Size for combined peak flow |
| Separate systems for suite and main | Each covers only its own household | Size each independently |
| Suite vacant or low-use | Lower combined peak | Standard single-household sizing may suffice |
Many Renfrew Specials have original gas piping sized for a standard tank, so a tankless conversion typically requires assessing and often upsizing the line to handle the unit's higher instantaneous draw. Venting also changes: a tankless unit needs a dedicated vent to the exterior rather than sharing an existing chimney or vent stack, which usually means a new wall penetration in the basement mechanical area, positioned according to the manufacturer's clearance requirements.
Some Renfrew homeowners choose a single larger tankless unit sized for both the main house and the suite, while others install two smaller units, one per living space, particularly when a suite renovation is already underway. Two units cost more upfront but give the suite and main house fully independent hot water, so a problem with one never affects the other, which some landlords value given the tenant relationship involved.
A gas permit and inspection are required for a tankless installation in Vancouver, and the work is signed off once complete. Given the gas line and venting changes typically involved in this neighbourhood's older housing stock, we recommend planning for a slightly longer lead time than a simple tank swap, especially if the project is timed alongside a suite renovation with its own permitting.
Safety note
If you smell gas near a boiler, water heater, or gas line, leave the home immediately and call FortisBC at 1-800-663-9911 from outside before doing anything else. Never try to find the leak yourself or operate light switches nearby. All gas fitting and boiler work must be performed by a Technical Safety BC licensed gas fitter; CANRO holds gas licence LGA0043870 and boiler licence LBP0046450.
Yes, provided it is sized for the combined peak demand of both living spaces, which a technician calculates based on realistic simultaneous use rather than just fixture count.
It depends on your priorities; two units give full independence so one household's use never affects the other's hot water, but they cost more upfront than a single properly sized shared unit.
Often yes, since original piping in many of these homes was sized for a standard tank rather than tankless demand. A technician assesses your existing line before installation.
It typically runs in a ballpark of $3,500 to $7,500 depending on gas line and venting work required, and sizing for a suite can push toward the higher end; this is a ballpark, not a quote.
Most tenants notice more consistent hot water availability, since tankless does not run out the way an undersized shared tank can during overlapping peak use times.
Yes, the tankless installation needs its own gas permit regardless of what other renovation permits are in place for the suite work, and your gas fitter typically coordinates this as part of the job.
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