Quick answer
A water heater inspection by a licensed gas technician is a diagnostic visit, so in the GTA it costs $90–$150. It covers venting and draft, the gas connection and a leak test, the relief valve and its discharge pipe, combustion air, the tank's age from the rating plate, and any sign of leaking. TSSA does not routinely inspect residential water heaters; a licensed contractor does.
How much a water heater inspection costs is simple to answer because it is priced as a diagnostic visit: $90–$150 in the GTA, with nothing sold unless something is wrong. The harder question is who is qualified to do it. A home inspector looks at a water heater; a technician holding a TSSA gas licence tests it, and only the second can speak to the gas and the venting.
Hot water heater inspection cost, and what can follow it
- Inspection of one tank or tankless unit: the $90–$150 diagnostic fee.
- If a repair is needed and you go ahead: the fee is credited toward it. Most water heater repairs are $150–$800.
- If the tank fails on age or corrosion: replacement is $1,200–$2,500 for a tank and $3,500–$6,500 for a tankless, quoted in writing.
- Furnace and AC on the same visit: ask when booking, since a whole-house check is scoped differently.
The published ranges for each of those are on the pricing page.
What a licensed water heater inspection checks
- Venting and draft: the vent connector's slope, joints and corrosion, the chimney liner or B-vent, and a spillage test at the draft hood with the burner running. On power-vent tanks, the blower, the plastic vent pipe and the outdoor termination.
- Gas connection and leak test: the shut-off valve, the connector and the drip leg, with an electronic detector and leak solution on each joint.
- T&P relief valve and discharge pipe: the right valve for the tank, and a full-size discharge pipe running down to near the floor that is never capped, reduced or threaded at the end.
- Combustion air: enough air for the burner, nothing stored against the tank, and no dryer or exhaust fan pulling the flue backward.
- Tank age from the rating plate: the serial number encodes the build date, and each manufacturer formats it differently.
- Signs of leaking: rust trails, moisture at the base or the fittings, a corroded drain valve, scorch marks at the burner door.
One finding is common in 1950s–60s bungalows and older two-storeys where the furnace has been upgraded to a high-efficiency model. The water heater is left alone on a masonry chimney that was sized for two appliances, the flue stays cold, the draft is weak and exhaust can spill at the hood. How to tell if a water heater is backdrafting shows the signs.
Know one thing before booking: a licensed technician who finds an immediate hazard is required to shut the appliance off and tag it. That is the purpose of an inspection, but it means a seller should inspect early, not in the week of closing.
Who asks for a water heater inspection
- Home buyers: a general home inspection is visual and is not a gas inspection, as whether a home inspection is enough explains. If the heater is a rental, the buyer also takes on the contract.
- Insurers: many ask for the age of the tank at renewal or after a claim, and some want its condition confirmed on older tanks. The rating-plate date and written findings answer that.
- Landlords: a documented check of the fuel-burning appliances between tenancies protects the tenant and the owner, alongside the carbon monoxide alarms Ontario requires in homes with fuel-burning appliances.
- Owners weighing a rental buyout: know the tank's age and condition before paying a buyout on it. Buy out or replace a rental water heater runs the comparison.
Does TSSA inspect residential water heaters?
No, not routinely. The Technical Standards and Safety Authority regulates fuels in Ontario, licenses gas technicians, registers fuel contractors and investigates incidents. It does not send inspectors to check household water heaters on a schedule. The practical route to an inspection is a registered contractor whose technician holds a G2 or G1 licence and works to the CSA B149.1 gas code.
Enbridge Gas will respond to a gas smell and shut off an appliance it finds unsafe, but that is not a condition report you can hand to a buyer or an insurer.
What you should get for the inspection fee
Ask for the findings in writing: make, model and serial number, the age, what was tested, what passed and anything that needs repair, with a written price for each item. An insurer or a buyer's lawyer wants a document, not a verbal all-clear. If the tank is past 10 to 12 years, expect a plain recommendation to budget for replacement even when everything passes on the day.
An electric tank has no gas or venting to test, so its inspection is shorter: the wiring connections, both elements and thermostats, the relief valve, the age and any leaks. A tankless inspection adds the condensate drain, the intake and exhaust terminations, the error history on the controller and a check for scale.
ZK Mechanical is owner-operated out of Burlington, and its TSSA-licensed gas technicians inspect gas, electric, power-vent and tankless water heaters across Halton, Hamilton, Mississauga and Brampton. Repair and replacement options are on the water heater service page; to book an inspection, call (647) 801-1252 or send a request.