The tank (or tankless unit) that heats the home's water. A conventional storage tank typically lasts 8 to 12 years; past about 10 it's on borrowed time, and past about 12 a failure, and a wet floor, can happen any day. Inside a tank, a sacrificial anode rod corrodes in place of the steel tank wall; in hard-water areas it can be used up in 3 to 5 years, and once it's gone the tank itself starts to rust, which is what eventually ends the unit's life.
$1,800 to $2,800 to replace an owned tank in Ontario ($3,500 to $6,500 tankless); many ON units are rentalsAddress soonPlumbingHeating
The quick answer
A storage water heater lasts about 8 to 12 years; past 12, a leak and a wet floor can happen any day. The trick is simply reading the manufacture date on the label, which most buyers skip. A replacement runs about $1,800 to $2,800 for a tank ($3,500 to $6,500 for tankless). And in much of Ontario the tank is rented, not owned, so ask, because the rental contract transfers with the home.
You are reading the water heater age & end of life page. Type the year the house was built and I will tell you what else tends to be true at that age, what it costs, and what to ask. One number, ten seconds.
Free. No account. Educational and impartial, not a home inspection.
Why it matters
It's not dramatic, but it's a near-certain near-term cost and an easy negotiation chip, and a leaking tank can damage finishes below it. The key is simply knowing the age, which is printed on the label and which most buyers never check. (Note: in much of Ontario, water heaters are often rented, not owned, worth confirming, since a rental contract transfers with the home.)
How to spot it
Read the manufacture date on the rating label (if there's no plain date, the serial number usually encodes the year and week). Watch for rust at the base, corrosion at the fittings, or pooling. Note whether it's a tank or tankless, gas or electric, owned or rented, and whether the temperature/pressure (T&P) relief valve has a proper drain pipe.
What it costs
Ontario installed pricing: a standard owned gas tank runs $1,800 to $2,800; tankless $3,500 to $6,500. Many Ontario water heaters are rentals ($20 to $55/month) whose contract transfers with the house. Ask which it is, because a rental isn't a replacement cost but is a monthly obligation.
What to do
Address soon if it's near end of life. Get the age, budget a replacement, ask the agent when it was last replaced, and confirm whether it's owned or on a rental contract.
Education and triage, not a home inspection. Casaroo reads the age off your label photo and estimates remaining life, a licensed plumber or gas technician confirms condition.
Common questions
Is the water heater rented or owned?
In much of Ontario it is rented, and the contract transfers with the house. That is a monthly obligation rather than a replacement cost, and it is worth confirming before you budget, because the two are completely different things.
How old is too old?
A conventional tank typically lasts eight to twelve years. Past about ten it is on borrowed time, and past twelve a failure and a wet floor can happen any day. Replacement is $1,800 to $2,800 for an owned gas tank.
Where do I find the age?
On the rating label. If there is no plain date, the serial number usually encodes the year and week. Most buyers never look, which is exactly why an aging tank is such an easy negotiation chip.
Can I get out of a rental contract?
It depends on the contract, and some have buyout terms that are unpleasant. Read the agreement before closing rather than assuming you can swap the unit out for an owned one whenever you like.
Lifespans vary with water hardness and maintenance; a licensed plumber/gas technician confirms condition. Casaroo flags, it does not inspect.
Last reviewed 2026-07-10.
This guide is general education, not a home inspection and not advice for your specific property. Always
consult the appropriate licensed professional, and get a licensed home inspection before you remove conditions
or buy. Cost ranges are 2026 estimates that vary by region, size, and access; confirm specifics with a
qualified professional.