A gas water heater quote depends on tank size or tankless capacity, venting type, gas line condition, and site access, not a single fixed price.
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Quick answer
A gas water heater quote is built from the type of unit (storage tank or tankless), its capacity, the venting it requires, the condition of the existing gas line, and how accessible the installation location is. As a ballpark, not a quote, a tankless install commonly runs $3,500 to $7,500 depending on venting and gas line work; a storage tank's cost depends on size, vent type, and access, and is best quoted after a short assessment. A firm number always follows a look at the actual installation site.
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A storage tank water heater's price depends heavily on its capacity, the venting type it uses, and whether the replacement can reuse the existing vent and gas connection or needs upgrades to meet current code. Because storage tank pricing depends so much on size, vent type, and site-specific access, a firm number is best given after a short in-person assessment rather than an off-the-shelf figure. A tankless unit has its own layered pricing: the unit itself, whether the existing gas line can supply its higher flow rate without upsizing, and whether new venting needs to be run to an exterior wall, since tankless units vent differently than most tank models.
In Metro Vancouver's older housing stock, laneway homes and secondary suites often push hot water demand higher than the original system was designed for, which is a common reason homeowners look at a tankless replacement even when the existing tank hasn't failed yet.
Access matters more than people expect. A water heater in an easily reached utility room costs less to swap than one wedged into a tight crawl space or an awkward closet, because labour time scales with how difficult the space is to work in safely.
| Factor | Storage tank | Tankless |
|---|---|---|
| Venting | Often reuses existing vent if code-compliant | Frequently needs new venting to an exterior wall |
| Gas line demand | Generally matches existing supply | May require a larger gas line for peak flow |
| Space | Needs floor or platform space | Wall-mounted, frees up floor space |
| Ballpark | Depends on size, vent type, and access | Commonly $3,500–$7,500, not a quote |
A written quote should identify the unit's type and capacity clearly enough that you could verify it once installed, spell out what venting and gas work is included, and state whether permits are part of the price. If a quote is unusually low compared to others you've received, ask specifically what happens if the technician finds the gas line undersized or the venting non-compliant once the old unit is removed, since unclear answers to that question are where surprise charges usually come from.
Have your household's hot water habits in mind, such as how many bathrooms run at once and whether a laneway or secondary suite shares the same system, and mention any recent changes to hot water demand. Book an in-person assessment so the quote reflects your actual gas line, venting, and access rather than an average. The published ballparks are useful for budgeting, but the specific number for your home comes from that visit.
Safety note
Gas water heater installation involves gas line, venting, and combustion work that must be completed by a Technical Safety BC licensed gas fitter; CANRO holds gas licence LGA0043870. If you smell gas at any point, leave the home and call FortisBC at 1-800-663-9911.
Tankless units often require new venting and can need a larger gas line to supply their peak flow rate, which adds labour and material cost beyond the unit itself.
Not reliably. Venting type, gas line condition, and access all vary by property and directly affect the final number.
It's common, but always confirm removal and disposal are explicitly included in the written quote.
Extra hot water demand from additional living space can change the sizing recommendation, which affects both the unit selected and the price.
The technician will note this during assessment and include any required upsizing in the quote, since supplying a tankless unit with too little gas flow affects its performance.
Permit fees vary by municipality; ask your contractor whether they're included in the quoted price or itemized separately.
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