132 Cartwright Ave, North York ON
Mon–Sat 8am–7pm · Sun 9am–5pm
Green heating · condensing boilers
High-efficiency condensing boilers
for eco-conscious Toronto homes
Looking for reliable boiler repair and replacement across Toronto and the Greater Toronto Area? Toronto Air Systems delivers TSSA-licensed assessment, installation, repair, and maintenance from our North York shop at 132 Cartwright Ave — with written quotes, clear options, and equipment sized for real Ontario winters and humid GTA summers.
Efficient heat, less gas
What actually makes a boiler “eco-friendly”
A standard, non-condensing boiler sends flue gas — and a meaningful chunk of the heat in it — straight up a metal chimney at around 300–450°F. A condensing boiler runs that exhaust through a second heat exchanger first, cooling it enough that water vapour in the flue gas condenses back to liquid and releases its latent heat into your system instead of your chimney. The result is an AFUE rating of 90–98%, versus roughly 65–83% for the standard cast iron boiler still running in a lot of older GTA homes.
We’re not going to pitch solar thermal or geothermal here — for most Toronto lots and budgets they’re impractical retrofits. A high-efficiency condensing boiler is the upgrade that actually moves the needle on gas consumption and carbon output for a hydronic home, and it’s equipment we install regularly. See our full boiler repair & replacement service, and check current programs on our rebates & incentives page before you buy.
One nuance worth knowing before you shop: a condensing boiler only condenses — and only hits its top efficiency numbers — when the water returning to it is cool enough (roughly below 130°F). Homes with old, oversized cast iron radiators or high-temperature baseboard loops sometimes need a modulating control strategy or supplemental low-temp emitters like radiant floor heating to fully realize the efficiency gain — otherwise you’ve bought a condensing boiler that mostly runs like a standard one.
Toronto and GTA conditions are not mild-climate marketing charts. Design temperatures, humidity, older building stock, and mixed fuel strategies change how boiler repair and replacement should be specified. We start with how you use the space — occupancy, hours, duct capacity, electrical service, and existing equipment — before recommending parts or a full replacement.
Homeowners, landlords, and facility managers call us when systems short-cycle, ice up, leave rooms uneven, spike utility bills, or fail on the first deep freeze or heat wave. Whether you need a same-week repair or a planned upgrade, we document findings and present repair-versus-replace paths with pricing you can compare.
Explore related hubs for heating, cooling, and commercial HVAC, or ask about rebates and incentives that may apply to high-efficiency equipment. Call 647 953-4252 with model numbers and symptoms so we arrive prepared.
What matters most for boiler repair and replacement in the GTA
Right sizing, licensed gas/refrigeration work, and commissioning beat the cheapest sticker price. We verify airflow, safety devices, condensate paths, and controls so your system does not fail the first extreme week of the season. Ask us about dual-fuel, zoning, and rebate-eligible models during your quote.
Signs it’s time to consider a condensing upgrade
- Current boiler is rated below 85% AFUE or older than 20 years
- Gas bills climbing without a change in usage habits
- Boiler is noisy, kettling, or increasingly unreliable
- Replacement parts are getting hard or expensive to source
- You want a real reduction in carbon footprint, not a gesture
- Planning a radiant floor addition that pairs well with low return temps
- Curious whether current rebates offset the upgrade cost
- Frequent repair calls are adding up faster than a new install would cost
Practical sequence
How we approach boiler repair and replacement
A structured process so you always know the next step.
01
Consult
Goals & constraints
02
Assess
On-site measurements
03
Compare
Repair vs replace
04
Schedule
Parts & access
05
Execute
Licensed install
06
Verify
Commission & teach
Where this fits
Common boiler repair and replacement applications in Toronto & the GTA
Different buildings need different equipment paths. These are the scenarios we see most often.
01
Detached & semi-detached homes
Full replacements, dual-fuel strategies, and comfort fixes for older duct systems common across Toronto neighbourhoods.
02
Condos & townhomes
Compact footprints, quiet operation, and board-friendly installs where access and condensate matter.
03
Additions & renovations
Matching new loads without oversizing, including ductless zones where trunks cannot reach.
04
Light commercial
Retail, clinics, offices, and mixed-use spaces that need documented maintenance and predictable uptime.
05
Rental properties
Durable equipment choices, clear landlord options, and service plans that reduce emergency callouts.
06
Efficiency upgrades
High-AFUE / SEER2 / heat-pump paths with rebate paperwork guidance when programs apply.
Condensing boiler services
High-efficiency boiler installation, done to actually condense
Equipment selection and setup that targets real AFUE performance for your system — not just a sticker rating.
High-efficiency condensing installs
Modulating, condensing boilers sized and piped so your system can actually reach its rated efficiency.
Boiler services →Combi & system boiler options
Combination units for space-constrained homes, or system boilers paired with an indirect tank for higher hot water demand.
Rebate & incentive guidance
We check your proposed model against current federal, provincial, and utility programs before you commit.
See current rebates →Old boiler removal & disposal
Responsible removal of the outgoing unit as part of the install — no separate haul-away headache.
Venting & condensate retrofits
Condensing boilers vent through PVC, not the old metal chimney, and need a condensate drain — we handle both correctly.
Commissioning & efficiency verification
Combustion analysis at start-up to confirm your new boiler is actually running at the efficiency you paid for.
Related services
Ready to upgrade to high-efficiency heat?
From equipment selection to rebate paperwork, we handle the full condensing boiler upgrade.
01
Boiler Repair & Replacement
Condensing boiler installs sized and piped for real efficiency gains.
View boiler services →02
Rebates & Incentives
Check current programs before you commit to a high-efficiency model.
See rebates →FAQ
High-efficiency boiler FAQ — Toronto
What AFUE rating counts as “high efficiency”?
Generally 90% AFUE or higher qualifies as high-efficiency condensing. Many current models rate between 94–98% when installed and configured correctly.
Do condensing boilers need special venting?
Yes — sealed PVC or similar plastic venting rather than a traditional metal chimney, because flue gas temperatures are too cool to safely vent through metal. This is one of the bigger install differences versus a standard boiler swap.
Will my old cast iron radiators work with a condensing boiler?
Usually yes, but getting full efficiency benefit depends on return water temperature. We check your system’s design temps and, where needed, discuss controls or supplemental low-temp heating to actually hit the boiler’s rated performance.
Are there rebates for high-efficiency boilers in Ontario?
Programs and eligibility change — we verify what applies to your specific model at quote time. See our rebates & incentives page for current context.
What’s the difference between a combi boiler and a system boiler?
A combi heats domestic hot water on demand with no storage tank — good for space savings with moderate hot water needs. A system boiler pairs with a separate indirect tank, better suited to homes with higher or simultaneous hot water demand.
Do condensing boilers need different maintenance?
The core annual maintenance is similar, plus a check of the condensate drain and neutralizer, which a standard boiler doesn’t have. See our boiler maintenance services for details.
How do I find out if a condensing boiler is right for my house?
Call 647 953-4252 or use our contact form. We’ll look at your current system, return temperatures, and heating load before recommending a model.
How much does boiler repair and replacement cost in Toronto?
Cost depends on equipment capacity, brand, duct or piping complexity, electrical/gas upgrades, and whether you repair or replace. We provide written quotes after a site assessment so you can compare options fairly. Call 647 953-4252 for a visit.
Do you serve my area in the GTA?
Yes. We are based in North York at 132 Cartwright Ave and regularly serve Toronto, Mississauga, Vaughan, Markham, Scarborough, Etobicoke, Brampton, and nearby communities.
Are your technicians licensed?
Yes. Gas and refrigeration work is performed by TSSA-licensed technicians. We follow Ontario code practice for venting, refrigerant handling, electrical disconnects, and condensate management.
Cut gas use with a boiler that actually condenses
We size and pipe condensing boilers to hit their rated efficiency, not just carry the sticker. Call 647 953-4252.