If your boiler is leaking, kettling, or simply getting old, the first question is almost always: how much will a new one cost? In Toronto and the GTA in 2026, boiler installation runs roughly $5,500 to $13,000 — a wide range, because the type of boiler and the condition of your existing setup make a real difference.
Here's exactly what you can expect to pay and what drives the number.
Quick Answer: 2026 Boiler Price Ranges
| Boiler Type | Installed Price (2026) |
|---|---|
| High-efficiency combi boiler | $6,000 – $11,000 |
| Condensing system boiler | $7,000 – $13,000 |
| Conventional like-for-like swap | $5,500 – $9,500 |
| Combi conversion (boiler + tank removed) | $6,500 – $12,000 |
All ranges include equipment, labour, the gas permit, and TSSA inspection. Significant gas-line upgrades, extensive re-piping, or electrical work are quoted separately when needed.
What Drives the Cost
1. Boiler Type and Brand
A wall-mounted combi boiler (heat plus hot water) and a dedicated condensing system boiler sit at different price points, and premium brands cost more than value lines. We install Navien and Rinnai combis most often in the GTA — both offer strong value and parts availability.
2. Replacement vs. Conversion
A like-for-like swap (same fuel, same type, same location, reusable venting) is the most affordable job. Converting an old atmospheric boiler to a modern condensing unit — or swapping a separate boiler and tank for one combi — costs more because it involves new near-boiler piping, PVC venting, and sometimes condensate drainage. It also delivers the biggest efficiency gain.
3. Condition of Your Existing Piping
Old, corroded near-boiler piping, undersized gas lines, or a chimney that needs lining all add to the job. We note these during the on-site assessment so there are no surprises — the quote you get is the price you pay.
The Permit and Inspection
Every gas boiler installation in Ontario legally requires a gas permit and TSSA inspection. A proper contractor includes this in the quote and handles the paperwork. If a quote leaves out permits, that's a red flag: unpermitted gas work voids your home insurance and creates liability.
How to Keep Costs Reasonable
- Replace proactively in spring or fall, not mid-winter when demand and pricing peak
- Right-size the unit — oversizing wastes money up front and runs less efficiently
- Bundle a boiler + tank into a single combi to cut long-term running costs
- Get a written, itemized quote so you can compare scope, not just headline price
Want a real number for your home? See our boiler installation page or call for a fixed written quote across Toronto and the GTA.