HVAC Repair — Canada

Boiler: Repair or Replace? (2026 cost comparison)

The rule of thumb, from Consumer Reports: don't spend more than 50% of a comparable new unit on fixing the old one. For a boiler, that 50% line is about $2,145–$5,035 CAD — a new unit runs $4,290–$10,070 CAD and typically lasts 15–30 years. If a repair quote lands under that line and the boiler is not yet past its expected life, repair usually wins. Reviewed July 2026.

Repair vs. replace, side by side Estimated

Cost	Estimated range
Typical repair (this boiler, all faults we price)	$200–$2,200 CAD
New boiler (unit only)	$4,290–$10,070 CAD
The 50% line half a comparable new unit	$2,145–$5,035 CAD

Repair: min–max of every boiler fault we price (sources on each linked problem page) · New unit: Carrier Canada · Lifespan 15–30 years: Viessmann Canada · 50% rule: Hydro One · Reviewed July 2026 · Estimated

Age × repair-cost worksheet Estimated

Find your boiler's age down the side and your repair quote across the top. The cell is the way the 50% rule points — Estimated guidance, not advice.

Age of unit	Repair < 30% of a new boilerunder $1,285–$3,020 CAD	Repair 30–50%$1,285–$3,020 CAD – $2,145–$5,035 CAD	Repair > 50%over $2,145–$5,035 CAD
Under 11 years first half of typical life	Repair likely	Repair likely	Compare quotes
11–30 years second half, under typical lifespan	Repair likely	Compare quotes	Replace likely
Over 30 years at or beyond typical lifespan	Compare quotes	Replace likely	Replace likely

How this is built: we apply the 50% rule (Hydro One) — spend no more than half a comparable new unit's cost on a repair — with its lifespan corollary (replacement is favored once the unit is past the midpoint of its expected life and the quote tops 50%). Columns are your repair quote as a share of a new boiler ($4,290–$10,070 CAD); the $2,145–$5,035 CAD and $1,285–$3,020 CAD thresholds are just 50% and 30% of that range. Rows use the midpoint of the expected life (about 11 years — halfway through a typical 23-year lifespan) and the top of the sourced 15–30 years range (30 years). Nothing here is a per-unit price or a recommendation — it is a transparent reading of the rule.

Lifespan is bimodal by construction, not a single figure with a tolerance: the manufacturer's Canadian arm gives ~15 years as the average boiler life and 20-30 years or more specifically for cast-iron boilers, so the band spans both populations. Single Canadian lifespan source — no second Canadian boiler lifespan source was verified for this file. The same Viessmann Canada page supplies two of the heuristics above (the trailing-year 50% rule and the ~10-year manufacturer parts-support horizon). Natural Resources Canada's servicing cadence applies here: natural gas and propane boilers should be serviced at least every two years, oil-fired boilers cleaned and tuned annually. new_unit_cad is Carrier Canada's stated installed range ("including installation"); install_delivery_cad is null because it is a single bundled installed total, and Carrier does not publish a separable equipment/labour split.

One more thing before you replace

A newer boiler can cut energy and water use, which shifts the math on an older unit even when a repair is cheap: ENERGY STAR notes clothes washers over ~10 years and refrigerators over ~15 years are common efficiency-driven replacements.

Energy note: · Reviewed July 2026 · Estimated · Informational only

Price the repair first

Before you decide, get the likely repair figure for the exact fault — each page localizes to your metro:

Estimated ranges — see the methodology for how we build the repair figures and their named sources. This page is informational and is not repair, purchasing, or financial advice.

Reviewed by a Red Seal–certified appliance technician who also holds a Technical Safety BC gas ticket (Gas-C) and an ODS/halocarbon refrigerant ticket (CFC/HCFC/HFC).