What switching to a Navien tankless water heater involves for a Tsawwassen home, from gas line capacity to venting to the permit.
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Quick answer
A Navien tankless water heater gives Tsawwassen homeowners continuous hot water without a storage tank, but the swap from an existing tank unit usually means upsizing the gas line, running new sealed venting to an exterior wall, and pulling a Corporation of Delta permit. It suits homes with steady, moderate hot water demand more than it changes the household's actual usage pattern.
Need a licensed gas fitter for your tankless water heater? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
Most of the calls we get here start with a failing 40 or 50 gallon tank in a garage or basement mechanical room and a homeowner asking whether tankless makes sense as the replacement. It often does, but the gas line sized for a tank water heater is frequently too small for a tankless unit's higher instantaneous burner draw — tankless units fire harder for shorter periods rather than maintaining a stored reserve, so the gas supply has to keep up in real time.
Tsawwassen's coastal setting doesn't change the core installation, but it does affect what hardware we use outdoors. Vent terminations and any exposed fittings are chosen with the salt air in mind so they aren't corroding within a couple of winters.
A Corporation of Delta mechanical permit applies to tankless water heater installation, and the work is inspected. That's the step that confirms venting and gas sizing were actually done to code, not just installed to look right.
| Scenario | Rough ballpark | What affects it |
|---|---|---|
| Tankless install | $3,500–$7,500 | Gas line upsizing, venting run, isolation valve kit |
That range is a ballpark, not a quote — a straightforward swap where the gas line is already adequate sits toward the lower end; one that needs a larger gas line run from the meter costs more.
Navien's tankless models are rated for flow rate and temperature rise, and the specific numbers for the model proposed should come from the unit's documentation rather than a general figure, since they vary by model. What matters practically is how many fixtures run hot water at once in your home — a shower and a dishwasher running together is a different load than one bathroom at a time — and whether incoming water temperature (colder in winter) affects the unit's output at peak demand.
Tankless units need periodic descaling to clear mineral buildup from the heat exchanger, and how often depends on your water hardness. Most of Metro Vancouver, including Tsawwassen, draws on the regional reservoir supply, which is relatively soft — that generally means less frequent descaling than a home on well water would need, though we still recommend an annual check of the isolation valves and a look at the venting.
If an existing tankless unit is throwing intermittent faults, we check ignition, flow sensor readings, and venting before assuming the unit itself is failing — a lot of tankless service calls turn out to be a restricted vent or a scaled heat exchanger rather than a component that needs replacing.
Safety note
If you ever smell gas, hear an unusual hissing near the appliance, or suspect a venting problem, leave the home and call FortisBC at 1-800-663-9911 from outside before doing anything else. Gas boiler and gas water heater work in BC must be performed by a Technical Safety BC licensed gas fitter; CANRO holds gas licence LGA0043870 and boiler licence LBP0046450.
Often, yes. Tankless units draw more gas instantaneously than a tank unit, so the existing line sized for a tank is frequently too small — we check this during the assessment before quoting.
Yes, the Corporation of Delta requires a mechanical permit for tankless water heater installation, and the completed work is inspected.
It depends on water hardness. Tsawwassen draws on the regional reservoir supply, which is relatively soft, so descaling intervals are typically longer than they would be on well water — an annual check is still worthwhile.
It depends on the model's rated flow and your home's simultaneous demand. We size for your household's actual usage pattern rather than assuming one unit fits every home.
As a ballpark, not a quote: $3,500 to $7,500, with gas line upsizing and venting complexity being the main variables.
Restricted venting and scale buildup in the heat exchanger are common causes worth checking before assuming a component has failed. A licensed tech can diagnose the actual cause during a service call.
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