Newfoundland and Labrador · Energy · checked September 28, 2026

Combustion safety testing in St. John's

A combustion safety test checks that your furnace, water heater and fireplace vent their exhaust outside instead of into the house, which matters most right before and after you tighten the house up. In the St. John's area, the main heating energy is oil for 12% of households.

Get matched in St. John's → The combustion safety and spillage check
A gloved hand inserting a combustion analyzer probe into a furnace flue pipe in a basement

Cost

Included with an evaluation

Natural gas heat

No piped gas

Gas distributor

No piped gas

CO alarms required (existing homes)

None found

How St. John's is built

St. John's's houses by when they were built Ten house shapes, one for each tenth of St. John's's 42,120 houses. Before 1961: 22%, 1961–1990: 42%, 1991–2000: 11%, 2001 or later: 26%. Older houses glow hotter.
  • Before 1961 22%
  • 1961–1990 42%
  • 1991–2000 11%
  • 2001 or later 26%
Each house stands for one in ten of St. John's's 42,120 houses (single-detached, semi-detached, row and duplex), drawn by when it was built. The glow shows the usual pattern: older houses tend to be leakier and less insulated. Snowfall scales with heating degree-days. Sources: Statistics Canada 2021 Census (table 98-10-0233-01), NRCan HOT2000 climate data.

Why it matters in St. John's

In the St. John's area, 58% of households heat mainly with electric baseboards, about 7% with a heat pump, about 7% with a boiler and radiators and about 6% with a forced-air furnace; electricity is the main heating energy for 65% of households and oil for 12% (Statistics Canada, 2023).

St. John's has no piped natural gas for homes, so combustion appliances here are mostly oil, propane or wood, and each needs its own venting check.

The risk rises after air sealing: a tighter house plus a strong exhaust fan or dryer can pull exhaust back down a chimney. That's why advisors test for spillage during an evaluation and why it should be repeated after serious tightening.

The CO alarm rule in Newfoundland and Labrador

Newfoundland and Labrador's fire regulations require smoke alarms in existing homes but contain no CO alarm requirement.

What the check involves

  • Worst-case depressurization: exhaust fans and the dryer on, doors set to make the appliance room as negative as it gets.
  • A spillage and draft check at each appliance, with a CO reading.
  • A plan if anything fails: often a sealed-combustion appliance or a fix to the venting, done by a licensed gas or oil technician.

The combustion safety check in detail.

NRCan-licensed service organizations serving St. John's

Energy advisors check for combustion spillage during an evaluation; fixing a venting problem is work for a licensed gas or oil technician.

Source: NRCan list of licensed service organizations, checked September 28, 2026. Call to confirm your street is covered and ask about wait times.

Combustion safety test in St. John's: common questions

Are CO alarms required in St. John's homes?

Newfoundland and Labrador's fire regulations require smoke alarms in existing homes but contain no CO alarm requirement.

Who does combustion safety testing?

Energy advisors check for spillage during an EnerGuide evaluation. Repairs to venting or appliances are done by a licensed gas or oil technician.

I have CO alarms. Isn't that enough?

Alarms warn you once CO is already in the house. A spillage test finds a venting problem before it produces CO.

Combustion safety test near St. John's

Combustion safety test in Charlottetown797 kmCombustion safety test in Halifax893 kmCombustion safety test in Moncton931 kmCombustion safety test in Saint John1041 kmCombustion safety test in Fredericton1070 km All 70 cities →

Sources

Checked September 28, 2026. Census figures are for the municipality (Newfoundland and Labrador); climate data is NRCan's HOT2000 station St-John's International (11 km away).

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