Combi Boiler Installation Toronto

Combi boiler installation in Toronto and across the GTA: one wall-hung condensing unit that heats your home and gives you on-demand hot water. We install NTI, Navien and Viessmann combi boilers, sized to your home and your hot water use.

Most of our combi jobs are one of two things: replacing an old boiler plus a separate water tank with a single combi, or replacing an existing combi boiler that has reached the end of its life. Either way, we check that a combi is the right fit before we quote it, because for some homes it is not.

✓ TSSA-certified gas and hydronic technicians, licensed and insured
✓ NTI, Navien and Viessmann condensing combi boilers, up to 95% efficiency
✓ Sized for heat loss and hot water flow, not just the old unit's label
✓ 1-year labour warranty on every installation, plus the manufacturer's warranty
✓ Financing available, with no upfront payment options

🔁 Replace Your Boiler and Water Tank With One Combi

Many Toronto and North York homes with radiators have two separate appliances in the basement: a boiler for space heating and a gas water tank (often rented) for domestic hot water. Two appliances means two vents, two sets of maintenance and, in many cases, a monthly rental bill.

Old boiler and separate hot water tank before combi boiler replacement in Toronto — **Typical before:** old boiler for heat, separate tank for hot water.

Navien wall-hung condensing boiler installed by Bison Air in Toronto — **After:** one wall-hung high-efficiency unit, floor space back.

A combi boiler replaces both. What changes for you:

✓ Heat and hot water from one appliance, one vent, one annual service
✓ No more water heater rental once the rented tank is returned
✓ Hot water on demand, so it does not run out after the tank empties
✓ Floor space freed up in the basement or mechanical room
✓ Your existing radiators, baseboards or in-floor loops stay in place

💡 Rented water tank? Tell us when you book. We plan the install so the old tank can be disconnected the same day and returned to the rental company.

♻️ Replacing an Existing Combi Boiler

Combi boilers installed 10 to 15 years ago are now reaching the point where repairs stop making sense. Common reasons homeowners call us:

✓ Lukewarm or fluctuating hot water at the tap
✓ Repeated error codes, ignition faults or lockouts
✓ Heat exchanger leaks, scaling or corrosion
✓ Parts are discontinued or slow to get
✓ The old unit was undersized and never kept up with two showers

We do not just swap like for like. We check the gas line, venting, condensate drain and piping, then confirm whether the old size was right. If your household has grown, the new unit is sized for the hot water you use today.

⚖️ Is a Combi Boiler Right for Your Home?

Your home	Best fit	Why
1 to 2 bathrooms, small or medium home	Combi boiler	Covers heat and hot water in one compact unit
Tight basement or mechanical room	Combi boiler	No storage tank to find space for
3+ bathrooms used at the same time	Boiler + indirect tank	Stored hot water handles several showers at once
Large soaker tub or high hot water use	Boiler + indirect tank	A combi fills a big tub slowly
Ducted home, no radiators	Combi + hydronic air handler	Forced-air heat and hot water from one appliance

The deciding number is hot water flow, not house size. A combi heats water as it passes through, so it delivers a set flow rate. If that flow covers the fixtures you run at the same time, a combi is a great choice. If not, we will recommend a heat-only boiler with an indirect tank instead and explain why.

🏷️ Combi Boiler Models We Install

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

NTI

✓ NTI TRX Series II combi: TRX110C, TRX150C, TRX199C
✓ NTI FTVN combi: FTVN110C, FTVN150C, FTVN199C

Navien

✓ Navien NCB-H: NCB-190/060H to NCB-250/150H
✓ Navien NFC-H fire tube combi: NFC-175H, NFC-200H

Viessmann

✓ Viessmann Vitodens 100-W combi: B1KE-120, B1KE-199

Browse every model in our Boilers & Combi Boilers collection. Need forced-air heat from your combi? See the Hydronic Air Handlers collection. All equipment we supply and install is on our HVAC Systems with Installation page.

♨️ Combi Boilers for Radiators, Radiant Floors & Air Handlers

A combi boiler heats the same way a regular boiler does, so it works with:

✓ Cast-iron radiators and baseboard heating
✓ Radiant floor heating: basements, bathrooms, tile and stone floors
✓ Hydronic air handlers: forced-air heat from the combi, with central AC on the same ducts
✓ Small snow melt zones, where load allows (larger driveways need a dedicated boiler)

💡 Radiators but no air conditioning? Add cooling with a ductless heat pump, which may also qualify for heat pump rebates. Many customers do both in one project.

🔧 How Your Combi Boiler Installation Works

In-home assessment: current boiler and tank, radiators or floors, venting, gas line, condensate drain and how many fixtures you run at once.
Sizing: heating output to your home's heat loss, hot water to your actual flow needs.
Clear written quote with model, scope and timeline, plus financing if you want it.
Removal and installation: old boiler and tank out, combi mounted, piped, vented and gas-connected.
Flush, fill, startup and commissioning: heating zones tested, hot water temperature and flow checked at the taps.
Walkthrough and warranty registration so you know how your system works.

🏗️ Combi Boilers for New Homes & Renovations

For builders and major renovations we handle combi boiler system design, mechanical room layout, radiant floor and air handler integration, and domestic hot water setup. See custom home HVAC, multi-unit residential HVAC and, for larger buildings, commercial boiler installation.

💲 Combi Boiler Installation Cost in Toronto

Combi boiler installation cost depends on:

✓ Combi size (heating output and hot water flow)
✓ Whether you are replacing a boiler and tank, or an existing combi
✓ Venting changes and the condensate drain route
✓ Gas line size and distance
✓ Number of heating zones and the condition of existing piping

Every model page lists installed pricing, and we give a clear written quote after seeing your home. See real installed prices for every combi and boiler model in our Boiler Replacement Cost Toronto guide. HVAC financing spreads the cost into monthly payments.