Boiler Installation & Replacement — Toronto GTA

TSSA G2 install + hydronic loop commissioning per CSA B214

Boiler installation in Ontario is a TSSA G2-licensed gas-fired appliance install regulated under CSA B149.1 (gas code) and CSA B214 (hydronic heating code). RenoHouse coordinates condensing combi and heat-only boilers through certified HVAC partners, with ESA permit for circulator tie-ins, Toronto Building Permit for venting, and full construction wrap. Pricing $6,800 – $18,500 installed Q2 2026 GTA.

Quick answer

Boilers are most common in pre-1950 Toronto homes (radiator hydronic heat): Cabbagetown, Riverdale, Annex, Wychwood, Yorkville, Rosedale, Forest Hill. Often paired with tankless water heater removal when going combi.

What's included

• TSSA G2 site assessment & boiler load calc
• Tear-out of old boiler + venting + condensate (if condensing replacement)
• New boiler + circulator pumps + expansion tank
• Hydronic loop reconfiguration if zone changes
• New venting (Category IV PVC for condensing; B-vent or stainless for non-condensing)
• Gas line tie-in & leak test
• Condensate drain + neutralizer (condensing only)
• ECRA/ESA-permitted 120V tie-in + zone valves
• Honeywell Aquatrol / Tekmar / smart hydronic thermostat
• CSA B214 commissioning (pressure test, flow rate, vent draft test)
• 10-year parts manufacturer warranty + 3-year RenoHouse labour

Brand selection (Q2 2026 GTA distributor availability)

Combi vs heat-only — what to choose

Combi boiler (heats both hydronic loop AND domestic hot water on demand): eliminates the separate water heater tank, frees up floor space, single appliance to maintain. Best for: semi-detached, townhouses, smaller homes (≤ 2.5 baths). Limitation: simultaneous high demand (shower + dishwasher) can drop DHW pressure.

Heat-only boiler (radiator/radiant only, separate water heater): better for larger homes (3+ baths, high simultaneous DHW demand). Pair with separate tankless or tank water heater. More space but more reliable hot water under high load.

Toronto-specific scenarios

1. Pre-1950 radiator homes (Annex, Cabbagetown, Riverdale, Wychwood, Forest Hill) — replacing 50-80 year old cast iron boilers with condensing combi is standard scope. Often paired with radiator rehab (paint, leak check, valve replacement — separate service).

1. In-floor radiant heat retrofits — new basement renovations adding radiant floor pair with new condensing boiler. PEX manifold + boiler integration. Multi-zone radiant under 4-5 zones is common.

1. Heritage Conservation District homes — venting placement may need Heritage Permit (sidewall PVC vent visible from street). We default to rear-yard venting where possible.

1. Multiplex conversion (Bylaw 474-2023) — multiple boilers (one per dwelling unit) preferred over shared boiler with sub-metering. Adds 2-3K per unit.

1. Chimney liner issues — older B-vent / clay-lined chimneys often need new stainless liner ($1,200 – $2,800) if converting from non-condensing to non-condensing replacement. Going to condensing PVC eliminates the chimney issue entirely.

Permits & compliance

• TSSA G2 licensed gas fitter (subcontractor partner) — mandatory
• ESA permit for 120V tie-in (circulators, controls) and zone valves
• Toronto Building Permit for new venting through exterior wall, or any structural change
• Enbridge inspection for any gas-line modifications
• CSA B149.1 gas code compliance
• CSA B214 hydronic heating code compliance (pressure, flow, expansion)
• OBC 2024 Section 6 compliance

Pricing reality

Rebates (Q2 2026)

• HRS Smart Thermostat $75 — pair smart hydronic thermostat (Honeywell Aquatrol, Tekmar 5xx-Series) at install
• Greener Homes Grant — boiler-only NOT eligible (only heat pump + envelope work)
• Greener Homes Loan up to $40K — only when boiler is part of a deep-retrofit bundle WITH heat pump (rare for radiator homes)
• Toronto HELP Loan up to $125K via property tax — eligible for full HVAC + envelope retrofit bundles

FAQ

Q: How much does a boiler install cost in Toronto in 2026? A: $6,800 – $18,500 depending on type, modulation, and hydronic complexity. Most Toronto radiator homes upgrading to a condensing combi land at $9,500 – $14,500. Free on-site load calc quotes the exact number.

Q: Should I go condensing or non-condensing? A: Condensing every time unless the chimney/venting situation forces non-condensing. Condensing boilers operate at 95+ AFUE (vs 80% non-condensing), with side-wall PVC venting eliminating chimney issues. Fuel savings $300 – $600/yr typical Toronto. Payback 5-9 years on the upgrade premium.

Q: Combi or separate water heater? A: Combi: smaller homes, ≤ 2.5 baths, no simultaneous high DHW demand. Heat-only + separate tankless: larger homes, 3+ baths, multiple simultaneous hot water uses. Both are correct choices for the right home.

Q: Will my old radiators work with the new boiler? A: Yes if they're sound (no leaks, valves work). Old cast-iron radiators are excellent heat emitters and a strong match for modern condensing boilers. We pressure-test the radiator loop before commissioning the new boiler. Old radiators that don't pass pressure test get individual repair / replacement quoted separately.

Q: Can I add radiant floor while you're at it? A: Yes — adding radiant floor zone is a common scope expansion. Basement slab + bathroom floor are typical. $2,500 – $6,500 added per zone. Best paired with the boiler install since the manifold and boiler are sized together.

Q: How long does the install take? A: 2-3 days for condensing combi swap with chimney/venting changes. 1-2 days for like-for-like heat-only swap. 4-7 days if hydronic loop reconfiguration. Heat is off during the work; we coordinate to avoid extreme cold periods if possible.

Q: What about FIFA 2026 — can I install in May-July? A: Indoor boiler installs are not gas-line work — minimal FIFA impact. Downtown Toronto postal codes may have minor Enbridge inspector scheduling delays late June through July; we plan a 2-3 day buffer in those zones. Outside downtown core: no impact.

Q: Honeywell vs Ecobee vs Tekmar for boiler controls? A: Honeywell Aquatrol — best for simple multi-zone hydronic. Tekmar 5xx-Series — best for outdoor reset (boiler temp adjusts based on outside temp; saves 10-15% fuel). Ecobee — works but not optimized for hydronic (no outdoor reset). We default to Tekmar for premium, Honeywell for workhorse.

Q: How long should my new boiler last? A: 20-30 years for premium condensing (Viessmann Vitodens, Triangle Tube). 15-22 years for workhorse (Navien, IBC, NTI). 12-18 years for value (Lochinvar). Annual servicing critical — schedule before each heating season.

Q: What's the warranty? A: 10-year parts on most premium boilers (Viessmann 12-year HX, Navien 10-year HX). 3-year RenoHouse labour warranty (longer than our furnace warranty given hydronic system complexity). Lifetime warranty on the venting and gas piping installation.

Q: Why doesn't a heat pump make sense for my radiator home? A: Heat pumps deliver air at 38-43°C; radiators emit heat based on water temp 50-80°C. Air-to-water heat pumps (Lambda, Mitsubishi, NIBE) DO exist for radiator retrofits but cost $25K-$45K+ installed and need radiator replacement with low-temp emitters. For most radiator homes, condensing boiler is still the right answer in 2026 — heat pump retrofit becomes economic when fuel prices double from current. We model both at the consultation.

Toronto/GTA neighborhood considerations

• Forest Hill / Rosedale / Lawrence Park (heritage boiler): Original 1920s-1950s cast-iron sectional boiler (Crane, Burnham, American Standard atmospheric) at 60-70% efficiency. Modulating-condensing replacement: Viessmann Vitodens 200-W ($9.8K-$14K unit), Lochinvar Knight ($7.4K-$11K), Navien NCB-H ($6.8K-$9.8K). Asbestos rope-gasket + asbestos pipe-insulation Reg 278/05 Type 2 abatement $1.4K-$3.8K added scope. Typical scope $14K-$24K with abatement.
• North York / Scarborough / Etobicoke (rare boiler stock): Most homes ducted forced-air — boiler scope rare, mostly retrofit jobs for radiant-floor add-on. Combi-boiler (Navien NCB-H, Viessmann Vitodens) at $7.4K-$11K installed. PEX-A radiant-floor manifold + tubing $4.20-$7.80/sq ft of heated floor.
• Mississauga / Brampton / Vaughan (90s+): Very rare original boiler — mostly retrofit for in-floor radiant on basement or principal-bath. Standard combi-boiler $6.8K-$9.8K.
• Caledon / King City / Aurora (rural): Premium hydronic system with radiant-floor everywhere, snowmelt driveway, towel-warmer in every bathroom. Viessmann Vitodens 200-W or 222-F system-boiler with indirect tank, Buderus G115WS, Lochinvar Crest. Typical $24K-$48K full hydronic install.
• Downtown condos: Centrally-heated, no boiler in suite. Not applicable.

Permit + warranty: Ontario TSSA gas-permit + plumbing permit (Skilled Trades Ontario 306A plumber). Manufacturer warranty 10-12 years on heat exchanger (Viessmann Inox-Radial stainless, Lochinvar 439SS).