What's the annual cost of heating with a wood stove compared to natural gas in Ottawa?

Annual Heating Costs: Wood Stove vs. Natural Gas in Ottawa

The annual heating cost difference between a wood stove and natural gas depends heavily on fuel prices, burn efficiency, and how you use each system — but in Ottawa's climate, a modern wood stove used as a supplemental heat source typically costs $800 to $1,500 per year in firewood, while heating the same space with natural gas costs $600 to $1,200 per year, making natural gas marginally cheaper on pure fuel cost alone. However, the economics shift dramatically when you factor in the wood stove's superior efficiency and the emotional and practical value of independent heating during Ottawa's ice storms and power outages.

Why the Numbers Matter in Ottawa's Climate

Ottawa residents typically face heating costs far higher than Canada's national average because winters are brutally long and cold — the heating season runs from October through April (roughly 7 months), with sustained temperatures well below -10°C and frequent wind chill values approaching -40°C. A typical Ottawa home requires between 15,000 and 25,000 therms of natural gas per heating season, costing $2,500 to $4,500 depending on current commodity prices (which fluctuate significantly). In 2024-2025, natural gas in Ottawa averages approximately $0.95 to $1.15 per therm for residential customers.

A modern EPA-certified wood stove burning 4 to 6 cords of properly seasoned hardwood per heating season (the typical Ottawa household supplement load) costs approximately $1,400 to $2,700 in firewood at current Ottawa pricing of $350 to $450 per cord delivered. At first glance, this appears more expensive than gas. But here's where the real comparison gets interesting: a modern wood stove operates at 70 to 80 percent efficiency, meaning 70 to 80 cents of every fuel dollar actually heats your home. Natural gas furnaces achieve roughly 90 to 95 percent efficiency in modern high-efficiency units, but standard forced-air systems run 80 to 85 percent. When you adjust for efficiency, the per-BTU cost of wood heat becomes competitive with or cheaper than natural gas, especially if you have access to cheaper firewood, harvest your own wood, or have a neighbor who does.

The real advantage of wood heat in Ottawa, however, has nothing to do with pure economics. An ice storm knocks out the power, and your natural gas furnace becomes an expensive paperweight. Your electric baseboard heater, heat pump, and even your forced-air natural gas furnace all require electricity to run the blower motor and ignition system. A wood stove operates entirely independently — it needs no electricity, no gas line, and no connection to any utility. During the January 1998 ice storm that left parts of Ottawa without power for three weeks, wood stoves and fireplaces kept countless homes livable while neighbors with high-efficiency gas furnaces huddled under blankets in 12-degree living rooms. This is not a hypothetical risk in Ottawa; major ice storms happen roughly once per decade.

The True Cost Comparison

Let's work through a realistic annual scenario for an Ottawa homeowner using a wood stove as supplemental heat alongside a natural gas furnace:

Natural gas furnace alone (heating 100 percent of the home): 18,000 therms × $1.05 per therm = $18,900 per year (2024-2025 pricing; costs vary with commodity markets and exact usage).

Natural gas furnace + wood stove supplement (furnace at 70 percent, wood stove at 30 percent): Natural gas consumption drops to roughly 12,600 therms = $13,230, plus firewood cost of 4 to 5 cords at $400/cord = $1,600 to $2,000. Total: $14,830 to $15,230 per year — a savings of $3,670 to $4,070 annually compared to gas alone.

Important caveat: These numbers assume you have proper chimney venting, a WETT-certified installation, annual chimney cleaning, and access to seasoned firewood. They also assume you are actually willing and able to maintain a wood fire during Ottawa's long winters — if the wood stove sits idle most of the season, the math changes dramatically. You cannot save money on a wood stove that you do not use consistently.

Wood Quality Makes or Breaks the Economics

The single biggest variable in wood stove heating costs is fuel moisture content. Properly seasoned hardwood (15 to 20 percent moisture content after 12 to 18 months of air drying) produces roughly 8,500 to 9,000 BTU per pound. Green or unseasoned wood (40 to 60 percent moisture content, freshly cut) produces only 2,000 to 3,000 BTU per pound because so much energy goes into evaporating water instead of heating the home. This means you might need to burn twice as much green wood to achieve the same heat output, instantly doubling your fuel costs while also producing three times as much creosote and dramatically shortening your chimney's lifespan. Burning green wood is a false economy in Ottawa's harsh climate.

Hardwoods like oak, maple, ash, and birch — all common in Eastern Ontario — are far superior to softwoods like pine and spruce for home heating. Hardwoods produce roughly 20 to 25 percent more heat per cord and burn significantly longer, meaning you can load the stove once in the evening and have coals still glowing in the morning. Softwoods contain high resin content and produce excessive creosote, increasing chimney fire risk in a region where annual chimney sweeping is already a non-negotiable maintenance requirement.

Seasonal Pricing Variation

Natural gas prices in Ottawa fluctuate seasonally and are tied to global commodity markets — the current 5-year average has ranged from $0.65 to $1.45 per therm. Winter demand typically drives prices higher in November through February. Firewood prices also fluctuate but are more local — prices typically rise in August through October as heating season approaches and supply tightens. Smart Ottawa homeowners buy or cut firewood in spring or early summer when prices are lower and drying time is maximized.

The Intangible Factors

Beyond pure heating cost, wood stove owners cite several factors that influence their decision: the deep psychological comfort of a wood fire on a -30°C night (a factor that economists call "utility" but which homeowners experience as genuine warmth and security), the independence from

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