Mississauga, ON repair guide

Water Heater Repair in Mississauga: Rented Tanks, Buyouts and Who Fixes What

Mississauga was built out between the 1970s and the 1990s, and a large share of its water heaters were never bought at all: they are rented from Enercare, Reliance or another rental company under contracts that came with the house. That changes everything about a failure. A rented tank is the rental company’s to repair, a buyout has a price that depends on the tank’s age, and a replacement pitched at your door is illegal in Ontario. This guide explains how to tell what you have, who to call, and how to decide between repairing, buying out and replacing.

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By Michael, founder, fixmystuff.ca · Reviewed and updated 2026-09-11 · About 7–10 minutes

Rented or owned? Find out first

Look at the tank. A rental company’s label with an account or serial number means it is rented, and the monthly rental charge appears on your Enbridge or Alectra bill or on a separate invoice. A rented tank comes with service: the rental company repairs or replaces it when it fails, usually at no extra charge for the tank itself, and the call goes to them, not to a plumber. Calling an independent plumber to repair a rented tank can leave you paying for work the rental already covers.

If you bought the house recently, the rental contract transferred with it. Ask for the contract terms, the monthly rate and the buyout schedule in writing; they are yours to see under Ontario’s consumer rules.

SituationWho to callWho pays
Rented tank leaking or no hot waterRental company service lineRental company, per contract
Owned tank under manufacturer warrantyInstaller or manufacturerParts often covered, labour varies
Owned tank out of warrantyLicensed plumber or gas technicianYou
Tankless unit error codeThe installer or a TSSA-certified techDepends on warranty

Buyout, replace or keep renting

Rental contracts run for years and the monthly charge, over the life of the tank, exceeds the price of buying one outright. Buying out a tank costs a scheduled amount that drops as the tank ages, and once you own it the repairs are yours. The math favours buying out a young tank and letting an old rented tank fail on the company’s account before deciding. Ask the rental company for the buyout figure in writing and compare it with a plumber’s quote for a new owned tank, installed and permitted.

If you replace, decide tank or tankless with your usage in mind: tankless units suit steady demand and need annual descaling in the Lake Ontario water Peel Region supplies, while a conventional tank is cheaper to install and repair. Either way, keep the installer’s TSSA paperwork and the permit record.

  • Rental company name and account number
  • Contract terms and buyout schedule in writing
  • Tank age from the serial number
  • Plumber’s quote for an owned replacement, permitted
  • Enbridge or other rebate programs currently offered

Ontario rules that protect you

Ontario’s Consumer Protection Act bans unsolicited door-to-door sales of water heaters, furnaces, air conditioners and similar equipment. A salesperson at your door with a clipboard and a “free” upgrade is not allowed to sign you to a contract there, and a contract signed that way is not enforceable against you. Report it to Consumer Protection Ontario. Legitimate replacements start with you calling the company.

Gas water heaters are regulated by the Technical Standards and Safety Authority: the installer must be TSSA-certified, and the installation is registered. The City of Mississauga may require a plumbing permit where the installation changes; a like-for-like swap by a certified installer is usually simpler than a relocation or a tankless conversion. Ask what applies and keep the records.

What fails and when to stop using it

Tanks fail at the bottom: rust-through after ten to fifteen years shows up as a slow pool on the floor, and by then the tank is finished. Before that, a failed thermocouple or gas valve, a tripped high-limit, sediment that makes the tank rumble, and a leaking temperature-and-pressure relief valve are the common repairs. A leaking relief valve is a safety device doing its job; get it looked at rather than capping it.

If you smell gas, leave the house and call Enbridge Gas’s emergency line or 911 from outside. If the tank is leaking from the body, shut the cold water supply at the valve above the tank and, for a gas tank, turn the gas valve to off, then call the rental company or a plumber.

Questions to ask before booking

  1. Is this tank rented, and if so what does the contract cover?
  2. What is the buyout price today, in writing?
  3. Is your installer TSSA-certified, and will you register the installation?
  4. Does this replacement need a City of Mississauga permit?
  5. What warranty covers the tank, and what covers the labour?

Frequently asked questions

My Mississauga water heater is rented. Who fixes it?

The rental company. The account number is on the tank label and the charge is on your utility bill. Their service line, not a plumber, is the first call, and the repair is usually covered by the rental.

Can I buy out a rented water heater in Ontario?

Yes. Rental contracts include a buyout schedule that drops with the tank’s age. Ask for the figure in writing and compare it with the installed cost of a new owned tank.

Someone came to my door offering a free water heater upgrade. Is that legal?

No. Ontario bans unsolicited door-to-door sales of water heaters, furnaces and air conditioners, and contracts signed that way are not enforceable. Report it to Consumer Protection Ontario.

Do I need a permit to replace a water heater in Mississauga?

A gas tank must be installed by a TSSA-certified technician and registered. Whether a City plumbing permit applies depends on what changes; ask the installer and confirm with the City for a relocation or tankless conversion.

Nearby communities

The rental companies and the Ontario rules are the same across the GTA. Permit offices are municipal, so Brampton, Oakville and Toronto each have their own; ask which applies to your address.

Browsing more broadly? Start from the Mississauga repair hub for every local guide in one place.

Sources and further reading

  1. Consumer Protection Ontario: door-to-door sales banWhich products cannot be sold unsolicited at the door, and how to complain.
  2. Technical Standards and Safety Authority (TSSA)Certification for gas water heater installers.
  3. City of Mississauga: building permitsWhen plumbing permits apply.
  4. Enbridge Gas: safety and rebatesGas emergency line and current rebate programs.

Prices, programs, and acceptance rules can change. Check each source and obtain a written local quote before deciding.

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