Water Heater Installation Cost in Ontario (2026)
Replacing a water heater in Ontario costs between $900 and $2,500 for a standard tank unit installed. Tankless units run $2,500 to $5,000. Here is what drives the price and how to avoid overpaying.
2026 Ontario Price Summary
| Unit type | Installed cost | Lifespan |
|---|---|---|
| 40-gal tank (gas) | $900 – $1,600 | 8–10 years |
| 50-gal tank (gas) | $1,100 – $1,900 | 8–12 years |
| Electric tank (40–50 gal) | $800 – $1,500 | 10–15 years |
| Tankless gas | $2,500 – $5,000 | 15–20 years |
| Tankless electric | $1,500 – $3,000 | 15–20 years |
| Heat pump water heater | $2,000 – $4,000 | 10–15 years |
Prices include unit, labour, and permits. GTA market rates, June 2026.
Buy vs rent — the Ontario water heater trap
Many Ontario homeowners are locked into rental contracts at $25 to $45 per month — $300 to $540 per year — for equipment worth $900 to $1,500. After 5 years you have paid for the unit twice and still own nothing.
Buying outright and having it installed by a licensed plumber is almost always the better financial decision for anyone staying in their home more than 3 years. Check your rental contract for buyout terms — many can be cancelled with a one-time fee.
What affects water heater installation cost in Ontario
Tank vs tankless
A tankless unit costs significantly more to install but provides endless hot water, lasts twice as long, and can reduce energy bills by 20 to 30%. For families with high hot water demand, the long-term savings often justify the higher upfront cost.
Fuel type
Gas water heaters require a TSSA permit and gas line work on top of plumbing. Electric units are simpler to install but cost more to operate in Ontario due to electricity rates. If your home already has gas, a gas unit is almost always more economical.
Location and access
A water heater in an open basement near existing plumbing is straightforward to replace. Units in tight closets, crawl spaces, or locations requiring pipe rerouting add labour costs of $200 to $600.
Venting for tankless
Tankless gas heaters require direct vent (two pipes through an exterior wall). If your home does not have this already, adding the venting costs $300 to $800 extra. This is often the biggest hidden cost in a tankless upgrade.
Old unit removal
Most plumbers include old unit removal and disposal in their quote. Confirm this before signing — some charge an additional $75 to $150 for disposal.
Signs your water heater needs replacing
- →Unit is 10 or more years old
- →Rusty or discoloured hot water
- →Rumbling or popping sounds during heating
- →Water around the base of the unit — never ignore this
- →Hot water runs out faster than it used to
- →Unit requires frequent repairs
- →Significant increase in energy bills
Always use a licensed plumber for water heater installation
Water heater installation in Ontario requires both plumbing and gas permits. Unlicensed installation can void your home insurance and create carbon monoxide risks. Verify any plumber at ocot.ca and confirm TSSA certification for gas work at tssa.ca.
Every plumber on VerifiedPros is OCOT verified and WSIB cleared before receiving a single job lead.
Frequently asked questions
How much does water heater replacement cost in Ontario?
Between $900 and $2,500 for a standard tank unit installed. Tankless units cost $2,500 to $5,000 installed. Heat pump units cost $2,000 to $4,000 installed.
Should I buy or rent a water heater in Ontario?
Buying is almost always cheaper long-term. Rental programs charge $25 to $45 per month indefinitely. Buying pays itself off in 3 to 5 years.
How long does water heater installation take?
A tank replacement takes 2 to 4 hours. Tankless installation takes 4 to 8 hours. Most jobs are completed in one day.
Do I need a permit for water heater installation?
Yes — a plumbing permit and, for gas units, a TSSA gas permit. Your licensed plumber handles both as part of the installation.
How long does a water heater last in Ontario?
Tank units last 8 to 12 years. Tankless units last 15 to 20 years. Hard water in parts of the GTA can shorten lifespan.
What size water heater do I need?
For 2 to 3 people: 40-gallon. For 4 to 5 people: 50-gallon. For larger families or high demand: 60-gallon or tankless.
Related guides
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