Boiler Installation & Replacement Toronto

Boiler installation in Toronto and across the GTA: high-efficiency condensing boilers, combi boilers and complete hydronic heating systems from NTI, Navien and Viessmann, designed, piped and commissioned by a TSSA-certified team that works on hydronic systems every week.

Toronto has thousands of older homes heated by radiators and in-floor loops, and a boiler done right is still the most comfortable heat you can have. Whether you are replacing a 30-year-old cast-iron boiler, adding radiant floors, or building a custom home, we size the system to your actual heat loss and pipe it cleanly so it runs quietly for decades.

NTI condensing boiler with indirect water heater installed by Bison Air in Toronto

NTI condensing boiler with an indirect hot water tank, installed by Bison Air.

✓ TSSA-certified gas and hydronic technicians, licensed and insured
✓ NTI, Navien and Viessmann condensing boilers, up to 95% efficiency
✓ Heat-loss sizing, not guesswork: no oversized boilers that short-cycle
✓ 1-year labour warranty on every installation, plus the manufacturer's warranty
✓ Financing available, with no upfront payment options

🔥 Boiler Installation & Replacement Services

Bison Air installs modern high-efficiency gas boilers for existing homes, renovations and new construction across Toronto and the GTA. Our boiler installation services include:

✓ New boiler installation
✓ Boiler replacement (cast-iron and old atmospheric boilers)
✓ Condensing boiler installation
✓ Combi boiler installation
✓ Boilers for radiators and baseboard heating
✓ Boilers for radiant floor heating
✓ Indirect hot water tanks
✓ Hydronic air handler systems
✓ Mechanical room design and piping layout
✓ Zoning, circulators and smart controls

Every installation includes proper sizing, piping design, venting, gas work, startup and commissioning. See all the systems we supply and install on our HVAC Systems with Installation page, or our wider heating services in Toronto.

🏠 Boiler Replacement for Toronto Homes with Radiators

Many homes in Toronto, North York and East York still run on boilers installed decades ago: large cast-iron units, a separate gas water tank and miles of old piping. A modern wall-hung condensing boiler replaces all of that in a fraction of the space and uses noticeably less gas.

Old boiler and hot water tank before replacement in a Toronto basement — **Typical before:** old boiler and a separate gas water tank.

NTI TRX Series II condensing boiler installed by Bison Air in a Toronto home — **After:** NTI TRX Series II wall-hung condensing boiler, 95% efficiency.

Common signs it is time to replace your boiler:

✓ The boiler is 15 to 20+ years old
✓ Rising gas bills or uneven heat between rooms
✓ Frequent repairs, leaks or corrosion
✓ Banging, gurgling or noisy operation
✓ You want to remove a rented water tank and get hot water from the boiler

💡 No ducts and want air conditioning too? Radiator homes can add cooling with a ductless heat pump or a hydronic air handler that uses your boiler for heat. We design both.

⚖️ Which Boiler Is Right for Your Home?

Boiler type	Best for	Hot water
Heat-only condensing boiler	Radiators, baseboard, radiant floors, larger homes	Paired with an indirect tank for high demand
Combi boiler	Small to medium homes, tight mechanical rooms	Built in, on demand, no tank
Boiler + indirect water heater	Homes with 2+ bathrooms or large tubs	Large stored supply heated by the boiler
Multi-boiler cascade	Custom homes, multiplexes, commercial buildings	Indirect tanks or separate DHW

Modern condensing boilers reach up to 95% efficiency and modulate their output to match the weather, which is why they are now the standard for hydronic heating in Toronto homes.

🏷️ Boiler Brands & Models We Install

NTI is the boiler we install most, alongside Navien and Viessmann. Each model page shows sizes, specs and installed pricing:

NTI

✓ NTI TRX Series II: heat only or combi (TRX085 to TRX199)
✓ NTI FTVN: heat only or combi
✓ NTI TFTN Premium (up to TFTN285)
✓ NTI Trin & Stor indirect water heaters

Navien

✓ Navien NCB-H combi boiler
✓ Navien NHB heating boiler
✓ Navien NFB fire tube boiler
✓ Navien NFC-H fire tube combi

Viessmann

✓ Viessmann Vitodens 100-W (B1HE / B1KE combi)
✓ Viessmann Vitodens 200-W B2HE
✓ Viessmann Vitocell 300-V indirect tank

Browse every model in our Boilers & Combi Boilers collection and Hydronic Air Handlers collection.

📸 Recent Boiler Installations

NTI boiler mechanical room with radiant manifolds and circulator pumps in Toronto — NTI boiler with radiant manifolds and zone circulators.

NTI wall-hung boiler with radiant floor heating control panel installed by Bison Air — Boiler replacement tied into an existing radiant floor panel.

NTI wall-hung condensing boiler with copper heating zones installed by Bison Air — Multi-zone copper distribution with isolation on every loop.

Navien high-efficiency boiler installation by Bison Air in the GTA — Navien high-efficiency boiler installation.

Three NTI boilers in a commercial cascade installation by Bison Air in Toronto — Three-boiler NTI cascade for a commercial building.

More real projects, including custom homes and multiplexes, are on our project blog.

🔧 How Your Boiler Installation Works

In-home assessment: we look at your current boiler, piping, radiators or floors, venting, gas line and hot water needs.
Heat-loss sizing and system design: the boiler is sized to your home, not to the old unit.
Clear written quote with model, scope and timeline, plus financing if you want it.
Removal and installation: old equipment out, new boiler mounted, piped, vented and gas-connected.
Flush, fill, startup and commissioning: air removed, controls set, every zone tested.
Walkthrough and warranty registration so you know how your system works.

♨️ Boilers for Radiant Floors, Snow Melt & Air Handlers

A boiler can do much more than heat radiators. We design complete hydronic systems:

✓ Radiant floor heating: even, quiet heat for basements, tile and stone floors
✓ Heated driveways and snow melt: no shovelling, no salt on driveways, walkways and stairs
✓ Hydronic air handlers: forced-air heat from the boiler, with central AC on the same ducts
✓ Indirect tanks and hot water sized for your household

🏗️ Boilers for Custom Homes & Commercial Buildings

We work with builders, designers and property owners on hydronic design, mechanical room layout, radiant and snow melt integration, pump and zoning design, and full commissioning. See custom home HVAC, multi-unit residential HVAC and commercial boiler installation.

💲 Boiler Installation Cost in Toronto

Boiler installation cost in Toronto depends on:

✓ Boiler type (combi, heat only, or boiler plus indirect tank)
✓ Home size and heat loss
✓ Condition of existing radiators and piping
✓ Number of heating zones
✓ Venting and gas line changes

Every model page lists installed pricing, and we give a clear written quote after seeing your home. For real installed prices by type and model, see our Boiler Replacement Cost Toronto guide. HVAC financing spreads the cost into monthly payments. Planning a heat pump as well? See current heat pump rebates.