What's involved in installing a gas tankless water heater in an older Haney, Maple Ridge home, from venting to gas line sizing.
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Quick answer
Installing a gas tankless water heater in a Haney home usually involves running new dedicated venting to an exterior wall, checking whether the existing gas line is sized large enough for the unit's higher demand, and finding a suitable wall location, since tankless units mount rather than sit on the floor like a tank.
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A lot of the tankless conversations we have in Haney start with an aging tank water heater that's leaking or approaching the end of its service life, and the homeowner deciding to switch technology rather than replace like-for-like. A tankless unit heats water on demand instead of storing 40 or 50 gallons at temperature around the clock, and it frees up floor space in a basement mechanical room, which matters in some of the smaller basement footprints common in this area's older housing.
It's worth being clear about what tankless does and doesn't solve: it doesn't increase your gas line capacity or your home's overall hot water pressure on its own, and it has a maximum flow rate, so simultaneous heavy use — a shower and a dishwasher running together on a cold winter morning — still needs to be sized for properly.
Tank water heaters commonly vent through a shared chimney or a simple single-wall vent; tankless units need dedicated venting, usually a sealed PVC or stainless intake/exhaust routed to an exterior wall or through the roof. In an older Haney basement, that routing has to work around joists, existing ductwork, and finished ceilings, which is one of the bigger planning items on a retrofit. The gas line itself also needs review — many tankless units draw more gas volume than the tank they're replacing, and older homes sometimes have gas piping sized for the original, lower-demand appliance.
Sizing a tankless unit is about flow rate, not tank volume. A licensed installer calculates the number of fixtures likely to run at once — showers, the kitchen sink, a laundry hookup — and the incoming water temperature, which runs colder here in winter than in a warmer climate, meaning the unit has to work harder to hit the same output temperature. Undersizing is the most common tankless complaint we hear about from other installs: someone runs two showers at once in January and the flow rate just isn't there.
| Household Situation | Typical Consideration |
|---|---|
| 1-2 bathroom home | Standard single tankless unit usually sufficient |
| 3+ bathrooms, frequent simultaneous use | Larger unit or consider two units |
| Older, smaller gas line | Line upsizing likely needed |
| Basement mechanical room with limited exterior wall access | Venting route needs early planning |
A tankless installation, including venting and any gas line work, generally runs $3,500 to $7,500 in this region — a ballpark, not a quote, since venting complexity and gas line changes are the biggest cost variables from one house to the next. On installation day, a licensed gas fitter verifies gas pressure at the appliance under full firing load, checks the venting termination clearances from windows and doors, and tests the condensate neutralizer if the unit is a condensing model. Homeowners can help by clearing access to the planned mechanical room location ahead of time and noting where exterior walls are unobstructed for venting.
Rebate programs through FortisBC or CleanBC sometimes apply to high-efficiency water heater upgrades, but program details and eligibility change, so confirm current terms before assuming a specific rebate applies to your installation.
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.
Not usually in the exact same spot, since it's wall-mounted rather than floor-standing and needs its own venting route to an exterior wall. A licensed installer will identify the best nearby location during assessment.
Often, yes. Tankless units typically demand more gas volume than the tank they replace, and older Haney homes sometimes have gas piping sized for lower-demand equipment, so this gets checked before installation.
Not from running out of stored water, but a tankless unit does have a maximum flow rate. If it's undersized for your household's simultaneous fixture use, water pressure or temperature can drop when multiple things run at once.
A straightforward swap with an accessible venting route can often be done in a day; jobs needing gas line upsizing or a longer venting run typically take longer.
It can be, mainly for space savings and continuous hot water, but the retrofit cost is higher than in new construction because of venting and gas line work. A licensed assessment will tell you what your specific home needs.
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