How much can I save on Ottawa heating bills by adding a wood stove as a backup to my gas furnace?

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Ottawa Fireplaces · Accepted Answer

Adding a wood stove as a backup to your gas furnace can realistically reduce your heating bills by 15 to 40 percent during the months you actively use it, depending on how often you burn, how efficiently you operate the stove, and how cold the winter is. If you're burning consistently from November through March, you could save $800 to $2,000 or more on annual gas heating costs — but that savings depends entirely on the quality of your wood, your commitment to regular burning, and whether you're using the stove strategically or just running it sporadically.

Here's why the range is so wide in Ottawa specifically: a modern EPA-certified wood stove burns at 70 to 80 percent efficiency, compared to a typical gas furnace efficiency of 90 to 95 percent. That sounds like gas wins, but a wood stove generates intense, radiant heat that can make an entire main floor comfortable while allowing you to dial back the thermostat by 2 to 4 degrees Celsius in the rest of the house. That temperature setback — combined with the stove's high heat output (a good stove produces 50,000 to 70,000 BTU per burn cycle) — is where the savings come from.

The critical factor is seasoned wood. Green or unseasoned wood produces far more creosote, burns much cooler, and wastes energy. Hardwood (oak, maple, birch, ash — the species that dominate Ottawa) needs 12 to 18 months of outdoor stacking in a covered position to reach the 15 to 20 percent moisture content required for efficient burning. A cord of properly seasoned hardwood costs $350 to $450 delivered in Ottawa. A typical household burning a wood stove as supplemental heat uses 4 to 8 cords per season — so your fuel cost will be $1,400 to $3,600 for the season. Compare that to the gas savings, and you can see that wood stove heating makes economic sense in Ottawa's long, cold winter, but only if you're burning good wood consistently.

Operational discipline matters enormously. Many homeowners buy a wood stove expecting it to heat their home passively — that is not how it works. You need to plan your day around burning: loading the stove in the morning, monitoring it through the afternoon, adding wood before bed, and managing the damper properly so you're getting clean, efficient burns rather than smoldering, creosote-producing fires. If you're the type of person who would run the stove sporadically — burning on weekends or only during the coldest snaps — you'll see minimal savings because the furnace will still carry most of the heating load during the many moderate winter days in Ottawa. The real savings accrue when you commit to burning 4 to 6 days per week for 4 to 5 months.

Location within the house affects efficiency too. A wood stove in your main living area (living room, kitchen, or open-plan space) will heat that zone effectively and allow significant thermostat setback. A stove installed in a basement or isolated room will produce heat that doesn't reach where you actually live, wasting its potential. The best scenario is a stove positioned on the main floor in a central location where its radiant heat can warm multiple rooms and where you naturally spend time — this is where you'll see the $800 to $2,000 annual savings realistic.

Installation costs matter too. A new wood stove installation in Ottawa costs $4,500 to $9,500 including the stove, chimney pipe, hearth pad, and labour. At those costs, you're looking at a 3 to 5 year payback period if you achieve the $1,500 average annual savings. However, wood stoves last 20 to 30 years with minimal maintenance — you're essentially amortizing that initial cost over decades. Many Ottawa homeowners view it as an investment in both energy independence and comfort rather than a quick payback project.

One important caveat: a wood stove as "backup" heating means you still maintain your gas furnace as the primary system. You cannot simply turn off the furnace on days you burn — you need the furnace operational as a safety net for days you don't burn, nights when you're away, and rapid temperature swings during Ottawa's unpredictable spring and fall seasons. So the economics are not about replacing your furnace entirely but rather supplementing it.

Insurance and inspection. Any wood stove installation requires a WETT (Wood Energy Technology Transfer) inspection before your insurance company will cover it — this is not optional, and most insurers will not renew or will increase premiums for an uninsured wood stove. The inspection costs $250 to $450 and should be part of your project cost calculation.

The honest reality: a wood stove in Ottawa makes genuine economic sense if you (1) are committed to burning regularly throughout the cold season, (2) can source or purchase properly seasoned hardwood consistently, (3) enjoy the ritual and warmth of real wood burning, and (4) can afford the upfront installation cost. If you view it strictly as a financial calculation, the math works — but only with discipline and consistency. If you're

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