Boiler Installation Markham: High-Efficiency, Combi, Replacement and Hydronic Heating Service Across Unionville and Cornell
Boiler installation in Markham means larger heating loads and better distribution. Unionville, Cornell, and Markham Village custom homes across the L3P to L3S postal codes run hydronic and in-floor radiant systems where control faults are as common as equipment failure.
- L3P-L3S
- Same-day GTA dispatch, 4-hour cold-snap response
- TSSA G1/G2 Licensed Crew
- Unionville
- Cornell
- Markham Village
- 5-Star Customer Satisfaction
- Same-Day GTA Emergency Dispatch
- 22 Years of Boiler Installation Experience
- Written Workmanship Warranty
What Actually Stops GTA Homeowners From Replacing an Aging Boiler
Four objections come up on almost every call. Here is the straight answer to each, with the CAD numbers attached.
1. “The quote is huge, I am being oversold”
A high-efficiency condensing swap runs $6,500 to $12,000 CAD because it includes a new condensate line, PVC flue rework, near-boiler piping, expansion tank, zone controls, and the TSSA permit. Every line item appears on the quote in CAD. Combined Enbridge and federal rebates offset up to $11,500 CAD.
2. “You cannot tell if the technician is really licensed”
Ontario requires TSSA G1 or G2 certification for gas boiler work, plus CSA B51 for large-BTU pressure vessels. Certificate numbers appear on every invoice and TSSA permit numbers appear on completed work.
3. “Nobody publishes the price”
Our four CAD scope bands are published on this page: diagnostic $99 to $249, standard repair $200 to $1,200, major repair $1,200 to $3,500, and full combi installation $4,500 to $8,500. High-efficiency condensing runs $6,500 to $12,000 CAD.
4. “The boiler is 25 years old, repair or replace?”
Cast iron lasts 30 to 50 years but drops to 60 to 70 percent efficiency by year 25. A modern 95% AFUE unit cuts natural gas bills 25 to 35 percent, qualifies for up to $11,500 CAD in rebates, and pays back in 6 to 10 years. You get a written repair-versus-replace on every diagnostic.
What Boilers in Markham Actually Look Like
Newer custom homes with hydronic and in-floor radiant systems on larger heating loads.
Typical failure pattern: Control or circulator faults on higher-end hydronic and radiant distribution.
Postal codes served: L3P-L3S. Covering Unionville, Cornell, Markham Village and the surrounding neighbourhoods, under City of Markham.
Markham hydronic and combi systems run $5,500-$9,500 CAD for a swap; radiant work scales with zone count.
- Same-day GTA dispatch, 4-hour cold-snap response
- 22 years serving Markham and York Region
- TSSA G1/G2 technicians covering Unionville, Cornell and Markham Village
- 4-hour cold-snap response
Our Boiler Services in Markham
Boiler installation in Markham means larger heating loads and better distribution. Unionville, Cornell, and Markham Village custom homes across the L3P to L3S postal codes run hydronic and in-floor radiant systems where control faults are as common as equipment failure.
Most Requested High-Efficiency Condensing Boiler Installation Toronto
95%+ AFUE condensing boiler installation with 316L stainless heat exchangers, PVC side-wall venting, and full Enbridge plus Canada Greener Homes rebate coordination across Toronto and the GTA.
Space Saver Combi Boiler Installation Toronto
Compact wall-mounted combi boilers delivering uninterrupted heating and on-demand domestic hot water, sized by GPM for Toronto homes and fitted with descaling valves for GTA hard water.
Boiler Replacement Toronto
End-of-life gas boiler replacement for 15 to 40 year old systems, including cast iron conversions, chimney liner de-commissioning, gas line sizing, and disposal across Toronto and the GTA.
Commercial Boiler Installation Toronto
Rooftop and basement commercial boiler installation for retail plazas, restaurants, offices, and mid-rise condos, built to CSA B51 pressure vessel code and ASHRAE 90.1 efficiency standards.
Hydronic Heating and Radiator Installation Toronto
Hydronic distribution design and radiator installation: cast iron column radiators, baseboard convectors, thermostatic radiator valves, and oxygen-barrier PEX manifolds, balanced and air-eliminated.
In-Floor Radiant Heating Toronto
Hydronic in-floor radiant heating retrofits and new-build installs with PEX loop layout, mixing valves, and return-water protection across four zones in Toronto and GTA homes.
Best Value Boiler Maintenance and Annual Service Toronto
Annual 12-point boiler tune-up with digital combustion analysis, expansion tank pre-charge, water pH and glycol testing, and pressure relief valve testing to keep warranties valid.
Boiler Repair Toronto
Standard and major boiler repair across ignition, pressure, and heat exchanger faults, with published CAD bands and a written repair-versus-replace analysis on every diagnostic.
24/7 Dispatch Emergency Boiler Repair Toronto
24/7 emergency boiler repair with same-day GTA dispatch and 4-hour cold-snap response for no-heat, red-tag, ignition-lockout, and frozen condensate failures.
Why Markham Trusts Our Hydronic Work
- 22 Years of Boiler Installation Experience across Toronto and the GTA
- Controls diagnosed before equipment, so you are not sold a boiler you do not need
- In-floor radiant zone design, mixing valves and return-water protection
- Combi and condensing swaps $5,500 to $9,500 CAD, radiant priced by zone count
- TSSA G1 and G2 licensed, Manual J heat load on every installation
- Enbridge and Canada Greener Homes rebate paperwork filed for you
How Our Markham Boiler Installation Works, 6 Steps
From the first call to the rebate cheque, here is exactly what happens and in what order.
Site assessment
Postal code, home age, distribution type, existing AFUE, and heating load in BTU per square foot. Same-day or next-morning visit.
Manual J heat load and sizing
Written heat load with boiler capacity sized to the actual home load. No oversizing, which is what causes short cycling.
Written quote, three options
Combi, split system, and high-efficiency retrofit priced in CAD with parts, labour, permits, disposal, and rebate offset per option.
TSSA permit and scheduling
Ontario Building Code Part 6 compliance verified. Installation within 3 to 7 business days standard, 24 to 48 hours on emergencies.
Installation and commissioning
Boiler installed to CSA B51, near-boiler piping to ASHRAE 90.1, condensate neutralised, combustion analysis with a CO monitor, system purged and rebalanced.
Verification and rebate filing
TSSA inspection where required, warranty registration filed, Enbridge and Canada Greener Homes paperwork submitted, written workmanship warranty issued.
Need a boiler quote in Markham?
Published CAD pricing, TSSA-licensed technicians, and same-day dispatch across the whole coverage area.
Reaching Unionville, Cornell and Markham Village
Markham dispatch runs on Highway 407, Highway 404, and Highway 7 with Main Street Unionville, Kennedy Road, and Ninth Line as the local connectors. Cornell sits east off Highway 7 near the hospital, Unionville is central, and Markham Village runs along Main Street North. Same-day dispatch covers the L3P to L3S postal codes.
Markham jobs take longer on site than a straight combi swap because the systems are larger. A custom home with four radiant zones, a mixing station, and an indirect tank is not diagnosed in fifteen minutes. We budget the assessment accordingly rather than rushing it and guessing at the fault.
Cold-snap response is four hours. On radiant systems the priority on arrival is protecting the slab loops and the mixing valve, not just restarting the burner, because a hard restart at full supply temperature on a cold slab is how a good radiant system gets damaged.
Markham Systems Are Bigger, and Controls Fail Before Boilers Do
Unionville and Cornell custom homes run heating loads well above the GTA average, often with three to five zones split between in-floor radiant on the lower level and hydronic baseboard or panel radiators above. Markham Village has a mix, with some older homes on conventional hot water distribution and newer infill on radiant.
On systems this size, the boiler is rarely the first thing to fail. The outdoor reset sensor drifts, a zone valve actuator sticks, the mixing valve loses its setpoint, or a circulator cartridge seizes on one loop while the rest of the house still heats. The symptom looks like a failing boiler, which is why so many Markham homeowners have been quoted a replacement they did not need.
We diagnose the control layer first. That means checking the outdoor reset curve, the zone synchronisation, the delta T across each loop, and the mixing valve setpoint before anyone talks about a new boiler. When the equipment genuinely is at end of life, the replacement is sized from a Manual J heat load and the existing distribution is rebalanced rather than left as-is.
- Four-zone in-floor radiant diagnosis and loop balancing
- Outdoor reset curve setup and zone synchronisation
- Mixing valve and return-water temperature protection for slab loops
- Variable speed ECM circulator upgrades on multi-zone systems
- Manual J heat load sizing on replacement, no oversizing
What Markham Customers Say
Our Unionville custom home has in-floor radiant. They added zone controls and outdoor reset for $2,300 CAD and run-time dropped noticeably.
Vivian C.
Unionville
5-Star Customer Satisfaction
Cornell home needed a radiant zone added during a reno. Clean loop layout and manifold for $12,600 CAD.
Nathan W.
Cornell
Top-Rated Contractor
Markham Village boiler at end of life. New high-efficiency unit for $8,200 CAD with rebate coordination.
Laila F.
Markham Village
Trusted by Homeowners and Businesses
Tell Us What Your Boiler Is Doing
Short form, no gatekeeping. A TSSA-licensed technician follows up with a written CAD quote for Markham, and the diagnostic fee comes off the invoice when you authorise the work on the same visit.
- Four published CAD scope bands, never gated
- Same-day GTA dispatch, 4-hour cold-snap response
- Enbridge and Canada Greener Homes paperwork filed for you
- Written workmanship warranty on labour
Thanks, we have your message.
A TSSA-licensed technician follows up within one business day.
Request a Written Installation Quote
Send the details and a TSSA-licensed technician follows up with an itemised CAD quote. No email address required from us, no quote gating from you.
Boiler Installation Markham: Frequently Asked Questions
How fast can you reach Unionville or Cornell?
What does boiler work cost in Markham?
One zone is cold but the rest of the house is fine. Is my boiler failing?
Can you add a radiant zone during a renovation?
What is outdoor reset and is it worth it?
Do you size the replacement or just match what is there?
Do you cover Milliken, Thornhill and Greensborough?
How often should a multi-zone hydronic system be serviced?
Still have a question about your boiler?
Talk to a TSSA-licensed technician. Same-day GTA dispatch, 4-hour cold-snap response.
Boiler Service Coverage in Markham
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Book Boiler Installation in Markham
Same-day dispatch with a four hour cold-snap response, and an itemised CAD quote before any work starts.
- Written workmanship warranty
- Published CAD pricing, no quote gating
- TSSA G1/G2 licensed technicians