Boilers heat about 15 percent of Ontario homes (mostly pre-1970 builds and select higher-end newer construction). Pricing is less commonly discussed online than furnace pricing, leaving homeowners guessing. This guide gives real 2026 GTA installed prices by boiler type, what drives the spread, and when to replace vs hybridize with a heat pump.
Boiler Installation Prices 2026 (GTA)
Prices below assume retrofit replacement (existing radiator or in-floor system already in place). New-build with all-new distribution is significantly more.
| Boiler Type | Typical Installed Price | Best For |
|---|---|---|
| Standard condensing gas boiler | $5,500 to $9,000 | Most replacement scenarios; 92-95 percent AFUE |
| High-efficiency condensing boiler | $6,500 to $11,000 | Cold-weather homes wanting max efficiency; 96-98 percent AFUE |
| Combi boiler (heat + tankless hot water) | $4,500 to $9,000 | Smaller homes (under 2,500 sq ft) with space constraints |
| Electric boiler | $3,000 to $6,500 | Off-gas-grid homes; whole-home electrification path |
| System boiler (with separate hot water tank) | $6,500 to $12,000 | Larger homes with high simultaneous hot water demand |
What Drives the Price Range
Four factors explain why two similar homes can get quotes $3,000+ apart.
Output capacity (BTU/hr)
Boiler capacity is sized to your home heat-loss calculation. Typical residential range: 60,000 to 180,000 BTU/hr. Each step up the capacity ladder adds $400 to $800 in unit cost. Oversized boilers short-cycle and waste fuel; we size with a proper heat-loss calculation.
Efficiency tier
Modulating-condensing boilers at 95-98 percent AFUE cost more but use less gas. The payback on the extra $1,500 is typically 4 to 7 years in heating fuel savings.
Brand
Premium tier (Viessmann, Buderus, Weil-McLain): $1,500 to $3,000 more than mid-tier. Mid-tier (Navien, Rinnai, Lochinvar): the EcoFrost recommendation for most homes. Budget tier rare in residential Ontario.
Venting and piping changes
Newer condensing boilers vent through PVC sidewall (cheap) vs the older chimney (often needs liner). Switching venting type costs $300 to $1,200. Replacing old galvanized water connections with copper or PEX adds $200 to $600.
Replace, Repair, or Hybridize?
Three paths for an older boiler. The right choice depends on age, repair history, and your fuel-cost outlook.
- Repair if the boiler is under 12 years old, the repair is under $1,200, and you have no efficiency complaints.
- Replace if the boiler is over 15 years old, efficiency has dropped, or the cost of the repair exceeds 40 percent of a new install.
- Hybridize with a heat pump if you are open to electrification. We can add a heat pump that handles 70-90 percent of the heating load with the boiler as winter-peak backup. Qualifies for the $7,500 Home Renovation Savings rebate. Net cost is often lower than a like-for-like boiler replacement after rebates.
Ready to take the next step?
Free In-Home Boiler Assessment + Quote?Frequently Asked Questions
How much does a new boiler cost installed in Ontario?
How long does a boiler last in Ontario?
What is a combi boiler and is it right for Ontario homes?
Do boilers qualify for Ontario rebates?
Can I replace just the boiler without redoing all the radiator lines?
Boiler vs furnace - which is right for an Ontario home?
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