Water Heater Installation & Repair in Ontario
A water heater job usually falls into one of three categories: replacing a failing tank or tankless unit, repairing a leak or loss of hot water, or installing a new system in a home that didn't have one set up right. In Ontario, this also means dealing with rental water heater agreements, which are common with utilities like Enbridge, and knowing whether you own your unit outright or need to coordinate a buyout or swap with the rental company before a new install goes in.
We've listed 121 businesses across the province that handle this work, ranging from small local plumbing outfits to larger crews that run installation and repair as a dedicated line of business.
What to look for before you hire
- Licensing to work with gas lines (TSSA certification) if you're installing or repairing a gas-fired unit, not just a general plumbing license.
- Clear pricing that separates the unit cost from labor, permits, and disposal of the old tank.
- Whether they handle both tank and tankless systems, since tankless installs often need venting and gas line changes a standard tank swap doesn't.
- Warranty terms on both the equipment and the labor, since these are often different lengths.
Our ranked guide to Ontario plumbers scores companies on factors like responsiveness, review consistency, and how they handle pricing transparency, so you can compare options instead of picking the first search result. The full scoring breakdown is on our methodology page.
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All water heater installation & repair, ranked by score and relevance
220 businesses. The order weighs each business's overall score by how much of its reviewed work is water heater installation & repair, so a lower-scored specialist can rank above a higher-scored generalist. Filter and sort below, or open the full map view.
When you submit a quote or contact form through this site, your enquiry may be shared with partner providers who can do the work. We may receive a referral fee for these matches, but our rankings and scores are determined solely by our published scoring method and are never influenced by referral fees.
Common questions about water heater installation & repair
- How much does water heater installation cost in Ontario?
- A standard tank replacement typically runs a few hundred dollars for labor plus the cost of the unit itself, which varies by tank size and fuel type. Tankless installs cost more upfront because of venting and gas line work. If you're on a rental agreement, ask whether swapping the unit triggers a new rental contract or buyout fee before you commit.
- How often does a water heater need to be replaced?
- Most tank water heaters last 8 to 12 years, though hard water and sediment buildup can shorten that. Tankless units often last longer, sometimes 15 to 20 years, if they're flushed periodically to clear mineral deposits. If yours is past 10 years and showing rust-colored water or inconsistent temperature, it's worth getting it looked at rather than waiting for a full failure.
- What should I expect during a repair visit?
- A technician will usually check the thermostat, heating element or burner, pressure relief valve, and look for leaks or sediment buildup before deciding whether it's a repair or replacement situation. For gas units, they should also check venting and gas pressure. Expect a diagnostic fee that may be credited toward the repair cost if you go ahead with the work.
- How can I tell if a company does quality work?
- Look for consistent mentions of clean installs, proper permitting, and technicians who explain the problem rather than just quoting a price. Companies that are upfront about whether a repair makes sense versus a full replacement, instead of defaulting to the more expensive option, tend to hold up better under scrutiny.