Installing a higher-output tankless water heater or boiler sometimes calls for a bigger gas meter, since the existing one may not be rated for the new total load.
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Quick answer
A gas meter is rated for a maximum flow capacity, and if adding or upgrading equipment pushes your home's total connected gas load above that rating, FortisBC needs to install a larger meter before the new appliance can be safely commissioned. This most often comes up when converting to a high-output tankless water heater, adding a boiler alongside existing gas appliances, or adding a suite or laneway house with its own gas demand.
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The gas meter at your house isn't just a billing device — it's rated to safely pass gas up to a certain maximum flow rate. That rating is sized, when the meter is installed, against the expected total gas load of the appliances connected to it. As long as your home's combined gas appliances stay under that rating, the existing meter is fine. Problems start when new equipment pushes the total connected load above what the meter was sized for.
This is separate from gas line sizing inside the house, which your licensed gas fitter handles. The meter and the service line feeding it up to that point belong to FortisBC, and only FortisBC can upgrade the meter itself.
Converting from a standard tank water heater to a tankless unit is one of the most frequent triggers, because tankless units fire at a much higher BTU input on demand than a tank ever needs. Installing a gas boiler where there wasn't one before, or replacing an older, smaller boiler with a higher-output combi unit that handles both space heat and domestic hot water, is another common one. Adding a laneway house or secondary suite with its own gas water heater or boiler, fed from the same meter as the main house, can also push the combined load past the existing meter's rating.
It's worth noting that a meter upgrade isn't automatic just because you're adding gas equipment — it depends on the specific combined load versus the specific meter's rated capacity, which is why this always needs an actual calculation rather than a guess.
Your licensed gas fitter calculates the total connected gas load for the new equipment plus everything else already on the meter. If that total exceeds the existing meter's capacity, the fitter or contractor submits a request to FortisBC for a meter upgrade. FortisBC then schedules the meter change, which is separate scheduling from your contractor's installation timeline. Because this involves a utility, not just your own contractor, it commonly adds lead time to a project — sometimes a meaningful amount, depending on FortisBC's scheduling in your area.
This is one of the most overlooked timeline items in tankless conversions and boiler upgrades. Homeowners planning a renovation around a fixed date should ask early whether a meter upgrade might be needed, rather than discovering it partway through.
Older homes in Vancouver, Burnaby, and similar established neighbourhoods often have meters sized decades ago for a single furnace and a modest tank water heater. Adding a laneway house, finishing a basement suite, or upgrading to a combi boiler for heat and hot water together are all common Metro Vancouver renovation moves that increase total gas demand well beyond what the original meter anticipated. It's a routine part of these projects, not a red flag, but it does need to be planned for rather than assumed away.
Ask your contractor, early in the quoting process, whether the equipment you're considering will require a gas meter upgrade based on your home's existing setup. Getting that calculation done before finalizing a renovation schedule — especially one tied to a move-in date, tenant occupancy, or contractor availability — avoids the most common source of last-minute delay in these projects.
| Trigger | Why it raises total gas load |
|---|---|
| Tank to tankless water heater conversion | Tankless units fire at much higher peak input |
| Adding a boiler or upsizing to a combi boiler | Higher combined heating and hot water demand |
| Adding a suite or laneway house on the same meter | New appliances add to total connected load |
Safety note
Gas meter upgrades must be scheduled through FortisBC, and any related interior gas piping work must be performed by a Technical Safety BC licensed gas fitter under permit. If you ever smell gas, leave the home immediately and call FortisBC's emergency line at 1-800-663-9911 from a safe location.
Arrangements can vary, and FortisBC sets its own current policies and any associated costs for meter upgrades. Ask your contractor and FortisBC directly for the specifics that apply to your address and situation.
It depends on FortisBC's scheduling in your area and is separate from your contractor's own timeline, so it's worth asking about early rather than assuming it can happen quickly right before an install date.
No. The gas meter and the service line up to it belong to FortisBC, so only FortisBC can perform a meter upgrade. Your licensed gas fitter handles the interior gas piping and appliance installation, and coordinates the request with FortisBC.
Not automatically. It depends on your home's existing meter capacity and the combined gas load of all appliances after the new unit goes in. A licensed gas fitter has to calculate this for your specific situation.
You generally can't tell just by looking at it. A licensed gas fitter compares your home's total connected gas load against the meter's rated capacity to determine whether an upgrade is needed for new or added equipment.
Not necessarily, but it's common enough that it should always be checked, especially if the laneway house has its own gas water heater or boiler feeding off the same meter as the main house.
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