The Short Answer
A gas tankless water heater in BC’s Lower Mainland typically costs $3,000 to $6,000 installed in 2026, before GST. The unit itself is usually only a third to a half of that. The rest is the gas line, venting, condensate drain, electrical, permit and labour.
If your home already has a large enough gas line and a good venting path, you’ll land near the low end. If you’re converting from a tank in a home with a 1/2-inch gas line, plan for the middle to upper end.
What Makes Up the Price
| Component | Typical cost | Notes |
|---|---|---|
| Condensing tankless unit (residential, 150,000-199,000 BTU/h) | $1,500 - $3,000 | Brand, capacity and features like built-in recirculation |
| Installation labour | $800 - $1,800 | Removing the old tank, mounting, piping, commissioning |
| Gas line upsizing or new run | $500 - $2,500 | Most common add-on when converting from a tank |
| PVC venting (intake and exhaust) | $400 - $1,800 | Depends on the length and route to an exterior wall or roof |
| Condensate drain or neutralizer | $100 - $300 | Required for condensing units |
| Electrical outlet near the unit | $150 - $400 | Tankless units need 120V power |
| Gas permit | $150 - $400 | Required for every gas appliance installation in BC |
| Recirculation pump (optional) | $300 - $900 | Faster hot water at distant fixtures |
Why the gas line matters so much: a typical 40-50 gallon gas tank burns 30,000-50,000 BTU/h. A whole-home tankless unit can burn up to 199,000 BTU/h when you open a hot tap. Many Lower Mainland homes were plumbed with a 1/2-inch gas line to the water heater, and that’s often too small. Your installer sizes the gas line based on the total load of all your gas appliances and the length of the run back to the meter. Undersized gas supply is one of the top causes of a tankless unit that runs lukewarm (more on that in our tankless troubleshooting guide).
Tankless Cost by Installation Type
| Situation | Typical installed cost |
|---|---|
| Tankless to tankless replacement (gas line and venting already in place) | $3,000 - $4,000 |
| Tank to tankless, gas line OK, short vent run | $3,500 - $4,500 |
| Tank to tankless, gas line upsize, standard venting | $4,500 - $5,500 |
| Tank to tankless, long gas run or complex venting, recirculation added | $5,500 - $6,000+ |
Sizing for BC’s Cold Winter Water
Tankless units are rated in gallons per minute (GPM) at a given temperature rise. The number on the box usually assumes a modest rise. In BC winters, you need a big one.
- Metro Vancouver’s incoming water typically drops to around 5-10°C in winter.
- A comfortable shower temperature at the heater is around 49°C (120°F).
- That’s a rise of about 40-45°C (72-81°F).
At that rise, a 199,000 BTU/h condensing unit delivers roughly 4.5-5 GPM. In real use, that’s:
| Simultaneous use | Approximate flow |
|---|---|
| One low-flow shower | 1.5 - 2.0 GPM |
| Two showers | 3.0 - 4.0 GPM |
| Two showers + kitchen tap | 4.0 - 5.0 GPM |
| Two showers + dishwasher + laundry | 5.0 - 6.5 GPM |
For most families with two bathrooms, one high-capacity unit is enough. For larger homes, three or more bathrooms, or a deep soaker tub, consider two units in parallel or a model with a small built-in buffer tank. Ask your installer to size it for January water, not July.
Running Costs: What Tankless Actually Saves
The U.S. Department of Energy estimates tankless water heaters are 24-34% more energy efficient than storage tanks for homes using about 41 gallons of hot water a day or less, and 8-14% more efficient for homes using around 86 gallons a day. The savings come from not keeping 40-50 gallons hot around the clock.
At 2026 FortisBC rates (about $12.60 per GJ in variable charges), a typical Lower Mainland family’s water heating savings work out to roughly $50 to $100 a year. That’s real, but it won’t pay back a $4,500 installation on its own. People who choose tankless are usually buying:
- Endless hot water: no running out after the third shower
- Space: a wall-mounted box instead of a tank in the closet or garage
- Lifespan: about 20 years, versus about 10-12 years for a gas tank
- No tank flood risk: no 50-gallon tank to fail and leak
Tankless vs. Tank: Side by Side
| Gas tankless | Gas storage tank (40-50 gal) | |
|---|---|---|
| Installed cost | $3,000 - $6,000 | $1,500 - $3,500 |
| Typical lifespan | ~20 years | ~10-12 years |
| Hot water supply | Continuous (limited by GPM) | Limited by tank size and recovery |
| Space | Wall-mounted, compact | Floor tank |
| Annual maintenance | Descale / flush (every 1-3 years depending on water) | Flush; anode rod check |
| Cost over 20 years (equipment) | One unit | Typically two tanks |
Over 20 years, the gap narrows considerably: one tankless unit versus two tank replacements. For the full decision, see our tank vs tankless guide. For brand comparisons, see Rinnai vs Noritz vs Rheem.
What About Electric Tankless?
Whole-home electric tankless heaters exist, but in BC they’re rarely practical. Even the largest residential models (27-36 kW, needing 120-150 amps of dedicated electrical capacity) only deliver about 2-3 GPM at BC winter water temperatures. That’s barely one shower plus a tap, from more electrical capacity than many homes have available. Point-of-use electric units under a single sink are a different story and can make sense for a distant bathroom or a laneway home. For whole-home electric hot water, a heat pump water heater is usually the better and rebate-eligible choice.
Maintenance Costs
Tankless units need periodic descaling: flushing a vinegar or descaling solution through the heat exchanger to remove mineral buildup. Typical service cost is $150-$300.
- Metro Vancouver municipal water is very soft, so many homes can descale every 2-3 years.
- Well water in parts of the Fraser Valley is often harder, so plan on annual descaling, and possibly a scale-prevention filter.
Skipping descaling is the fastest way to shorten a tankless unit’s life and void parts of its warranty.
Rebates
Gas tankless water heaters are not covered by CleanBC or BC Hydro rebates, which are aimed at heat pump water heaters.
Starting Oct. 15, 2026, FortisBC is re-introducing a $2,500 water heater rebate for income-qualified natural gas customers. Check FortisBC’s rebates page for which models qualify, and Better Homes BC for heat pump water heater rebates.
Tankless Costs on the North Shore, in Burnaby and Across the Lower Mainland
North and West Vancouver. North Shore homes are often larger, built on slopes, and have mechanical rooms on a lower level far from the gas meter. That means longer gas runs and sometimes longer vent routes, which pushes installs toward the upper end of the range. Larger homes with three or more bathrooms are also where we most often recommend a recirculation pump or two units. A typical tank-to-tankless conversion in North Vancouver lands around $4,500 to $6,000.
Burnaby and New Westminster. Older houses here often have the water heater in a basement utility room sharing a chimney with the furnace. Switching to a condensing tankless unit means new PVC venting, and it can orphan the furnace or leave the chimney undersized, which needs to be addressed at the same time. Townhomes and condos add strata approval for new vent terminations. Budget $4,000 to $5,500 for a typical Burnaby house conversion.
Surrey, Langley and the Fraser Valley. Newer homes usually have the gas meter close to a garage-mounted water heater, which keeps gas and venting runs short. Many conversions land at $3,500 to $4,500. Homes on well water should add a scale-prevention filter and plan for annual descaling.
Bottom Line
Budget $3,000 to $6,000 for a gas tankless water heater in the Lower Mainland. The gas line and venting determine where you land in that range. Size the unit for January water temperatures, not the box rating, and plan for regular descaling. Tankless rarely pays for itself on gas savings alone, but with a lifespan around 20 years, endless hot water and a smaller footprint, it’s a strong choice for many BC homes.
Want a firm quote that includes a gas line and venting assessment? Call 604-991-4894 or send us a message. We install and service tankless water heaters across the Lower Mainland and Fraser Valley.
Frequently Asked Questions
A gas tankless water heater typically costs $3,000 to $6,000 installed in the Lower Mainland in 2026, before GST. A straightforward install where the gas line and venting are already adequate lands near the low end. Converting from a tank usually adds gas line upsizing ($500 to $2,500), new venting ($400 to $1,800), a condensate drain, an electrical outlet and a permit.
A tankless unit burns gas at a much higher rate - often up to 199,000 BTU/h compared with 30,000 to 50,000 BTU/h for a typical tank - so the existing 1/2-inch gas line frequently needs to be upsized. Condensing tankless units also need their own PVC venting, a condensate drain and a power outlet. The unit itself is usually only a third to a half of the total cost.
Size for winter. Metro Vancouver's incoming water can drop to around 5 to 10°C in winter, so a tankless unit has to raise it about 40 to 45°C to reach a comfortable 49°C (120°F). At that rise, a 199,000 BTU/h condensing unit delivers roughly 4.5 to 5 gallons per minute - enough for about two showers and a tap at once. Larger households often need two units or a high-capacity model.
A well-maintained gas tankless water heater typically lasts about 20 years, compared with about 10 to 12 years for a gas storage tank. Lifespan depends heavily on water quality and descaling. Metro Vancouver's soft municipal water is easy on tankless heat exchangers; hard well water in parts of the Fraser Valley needs more frequent descaling.
Some. According to the U.S. Department of Energy, tankless heaters are 24 to 34% more energy efficient than storage tanks for homes using 41 gallons of hot water a day or less, and 8 to 14% more efficient for homes using around 86 gallons a day. At 2026 FortisBC rates, that typically works out to tens of dollars a year, not hundreds. Most BC homeowners choose tankless for endless hot water, space savings and longer lifespan rather than bill savings alone.
CleanBC and BC Hydro rebates do not cover gas tankless water heaters; their hot water rebates are aimed at heat pump water heaters. Starting Oct. 15, 2026, FortisBC is re-introducing a $2,500 water heater rebate for income-qualified natural gas customers. Check FortisBC's program details for which water heaters qualify before you buy.
