Quick answer
Buy. A rented tank at $25–$45 a month adds up to $4,500–$8,000 over 15 years — two to four times the $1,500–$3,000 it costs to own the same gas tank installed — and the break-even lands in year 3 to 5. Renting only makes sense if you are moving within 2–3 years or cannot cover the upfront cost. Get your buyout figure in writing before you switch.
Should you rent or buy a water heater in Ontario? Buy, in nearly every case — the gap is large and it compounds. Ontario is one of the only places in North America where water heater rental is the norm, a legacy of decades of utility-affiliated rental programs, and a large share of GTA and Hamilton homes still pay a fee that was set up by a previous owner and never revisited. The math below prices the same tank both ways.
The 15-year math
- Renting: $25–$45/month, rising with annual increases — roughly $4,500–$8,000 over a 15-year tank lifespan.
- Some contracts bill quarterly instead: rental fees of $90–$150 a quarter add up to several times the purchase price over a tank's life.
- Buying: $1,500–$3,000 installed for a quality gas tank, plus occasional maintenance.
- Typical break-even point: 3–5 years — every year after that, renting is pure extra cost.
Rental companies counter that the fee includes repairs and replacement. It does — but a tank water heater is a simple appliance that rarely needs a major repair in its first decade, and the lifetime rental premium would fund a thermocouple, a gas valve and an entire replacement tank with money left over.
What the rental fee buys, and what it does not
- Included: repairs to the rented unit, replacement when it fails, and the rental company's own service line.
- Not included: your choice of brand, size or efficiency, any say in when it gets replaced, or the option to have another contractor work on it.
- Built in: annual fee increases, written into most contracts.
- Also built in: a buyout schedule — the fee to end the contract — that stays high for the first years of each new tank the company installs.
When renting does make sense
- You are selling within 2–3 years and do not want capital tied up in equipment.
- Cash flow is tight and the $1,500+ upfront cost is not workable — though HVAC financing usually spreads that cost at a lower total than renting.
- You live in a rental property where the landlord holds the contract anyway.
Escaping an existing water heater rental
Read the agreement before buying anything. Most Ontario rental contracts carry a buyout schedule tied to the tank's age — high for a recent install, low for a tank past 10 years — and some add removal or termination charges. Watch for contracts that renewed automatically or were transferred to you on closing when you bought the house. Two rules work in your favour: Ontario banned unsolicited door-to-door sales of water heaters and furnaces in 2018, and since 2024 rental companies can no longer register a Notice of Security Interest against your home's title over the contract. Get the buyout figure in writing, then compare buyout-plus-owned-unit against years more of payments — what a replacement costs in Ontario supplies the second half of that sum.
Renting and selling a house
A rental contract follows the house, not the owner: the buyer takes over the payments, and the contract shows up as a line in the agreement of purchase and sale. Buyers' lawyers increasingly ask for the rental terms and the buyout figure before closing, and an inherited contract with a steep buyout can become a negotiating point. If a sale is on the horizon, an owned tank makes for a cleaner listing; if you inherited a rental with the house, your lawyer's closing file has the contract and the company's contact information.
Owning, done right
- Choose the right size: 40–50 gallon tanks suit most GTA families of three to five.
- Consider tankless if you also want endless hot water and the floor space back — the tankless cost guide covers installed pricing.
- Flush the tank annually and replace the anode rod every 3–5 years — the maintenance tips cover both jobs.
- Keep the installation receipt; manufacturer warranties of 6–12 years on tanks require proof of the install date.
ZK Mechanical installs owned tank and tankless water heaters across the GTA and Hamilton, and will put your current rental payment beside the ownership math in writing — request a quote or call (647) 801-1252.