What's really involved in installing a gas tankless water heater in a larger Walnut Grove home, from gas line sizing to venting.
Tell us what you need—we’ll call you back fast.
Quick answer
A gas tankless water heater installation in Walnut Grove usually takes a full day and often requires upsizing the gas line, since tankless units draw far more gas at peak demand than a standard tank. Venting also has to be run to an exterior wall, typically with dedicated intake and exhaust piping. A licensed gas fitter checks both before quoting the job. Ballpark install cost runs $3,500 to $7,500, not a quote.
Need a licensed gas fitter for your hot water / boiler? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
A lot of homes in Walnut Grove were built with multiple bathrooms and enough bedrooms for a growing family, which means simultaneous hot water demand — someone showering while the dishwasher runs, or two bathrooms in use back to back in the morning — is a real daily pattern, not an edge case. A standard 40 or 50-gallon tank can run out under that kind of demand, while a properly sized tankless unit heats water on demand continuously as long as it's within its flow-rate capacity.
The other appeal is space: tankless units mount on a wall and free up the floor space a tank used to occupy, which matters in mechanical rooms that are also doing double duty for the furnace, laundry, and storage.
This is the step that trips up a lot of DIY-minded homeowners: a tankless water heater draws significantly more gas at peak firing than a standard tank does, and a lot of older gas lines simply aren't sized for it. A licensed gas fitter calculates the total gas demand of everything on the line — furnace, boiler, range, fireplace, dryer — and confirms the line to the water heater location can support the tankless unit's maximum draw, upsizing it if it can't.
Venting is equally non-negotiable. Tankless units are typically vented with dedicated intake and exhaust piping run to an exterior wall, sized and routed according to the manufacturer's installation manual and BC code. In a Walnut Grove home where the mechanical room is in the basement, that often means running vent pipe up through a wall cavity or along a joist bay to reach the exterior — a straightforward job for a licensed installer, but not something to shortcut.
On install day, the technician removes the old tank if one's being replaced, confirms and upsizes the gas line as needed, mounts the new unit, runs the venting to an exterior wall, and connects the water lines including an isolation valve kit that makes future descaling maintenance possible. Once everything's connected, the unit is pressure-tested, the gas connection is leak-checked, and a combustion check confirms proper venting before the system is handed back over.
A straightforward tankless install runs a ballpark $3,500 to $7,500 — not a quote — with the final number depending mainly on whether the gas line needs upsizing and how far the venting has to travel to an exterior wall.
Because Vancouver-area municipal water is relatively soft, scale build-up inside a tankless heat exchanger happens more slowly here than it would in a well-water area of the Fraser Valley, but it's not zero. An annual descaling flush through the isolation valves, along with checking the intake air filter if the unit has one, keeps the unit firing efficiently and helps it reach its expected service life.
Manufacturer warranty terms differ between brands, so ask your installer to walk through your specific unit's certificate — some warranties require proof of regular maintenance to stay valid.
Safety note
If you ever smell gas near a boiler or water heater, or notice soot, a sharp headache, or a pilot light that keeps burning yellow instead of blue, leave the house and call FortisBC's emergency line at 1-800-663-9911 before doing anything else. Never try to relight a gas appliance or trace a leak yourself.
Not the way a tank does, but it's limited by flow rate rather than volume — if too many fixtures draw hot water at once beyond the unit's rated capacity, the temperature can drop. Proper sizing for your household avoids this.
Often, yes. Tankless units draw more gas at peak firing than a standard tank, so a licensed gas fitter checks your home's total gas demand and upsizes the line if needed.
A typical installation takes a full day, longer if the gas line needs upsizing or the venting path is more complex than a straight run to an exterior wall.
Yes — an annual descaling flush is recommended, especially since municipal water still carries some minerals even though it's softer than well water. Isolation valves installed at the time of setup make this straightforward.
Usually, though the venting requirements are different from a tank's flue, so the technician needs a clear path to an exterior wall for the intake and exhaust piping.
Family-run, TSBC-licensed (gas LGA0043870 · boiler LBP0046450), serving Metro Vancouver homes since 1999. Residential, natural gas only.
Call (604) 359-1081 Email info@canroheat.ca“Canro does an amazing job! Super professional and skilled with everything—boilers, furnaces, and AC. Always a pleasure working with them!”
“Five stars for Canro. We needed a replacement of a 30-year-old boiler. A new high-efficiency unit was installed—clean, professional work.”
“I can’t speak highly enough about George, who was recommended for a boiler service call for my parents’ home. George is excellent.”
25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.