Signs you need this fixed
- Tea-coloured hot water, clear cold
- Tank knocks like a radiator in January
- Pilot flame dies a minute after lighting
- Showers go lukewarm by the second rinse
Symptoms and likely causes
Each complaint narrows the search.
| What you notice | Common culprits |
|---|---|
| No hot water at all (gas) | Pilot out, failed thermocouple or flame sensor, venting fault on a power-vent model |
| No hot water at all (electric) | Tripped breaker, blown element, tripped high-limit reset |
| Runs out fast | Sediment filling the bottom, broken dip tube, failed lower element |
| Rumbling or popping | Sediment layer boiling under the flame |
| Water on the floor | Relief valve discharge, loose fitting, or a rusted-through tank |
| Rotten-egg smell in hot water | Reaction with the anode rod |
Rental tanks: who to call first
A large share of Toronto homes rent their water heater rather than own it. Check the sticker on the tank and your gas bill. On a rented tank, repairs normally fall to the rental provider, who may object to outside work. Call them first. Our essay on rental water heaters covers buyouts and contract questions.
If you own the tank, we can diagnose and repair it.
Repairs that make sense
Many fixes are modest: a new thermocouple, igniter or gas valve on older atmospheric units; an element and thermostat on electric tanks; a replacement relief valve; or a power-vent motor. Flushing sediment helps a tank that is rumbling but otherwise sound, which is explained under water heater flush.
Gas or electric: what changes
Gas tanks rely on a burner, a thermostat-style gas valve and a flue that has to pull combustion gases outside. Power-vent models add a fan and pressure switch, which bring their own failure points. Electric tanks rely on two heating elements and their thermostats. They need no venting but recover more slowly after a long run of showers.
Knowing which type you have narrows the questions we ask when you call. A photo of the label on the tank helps a lot. It shows the model, fuel type, capacity and the serial number that reveals its age.
Safety checks you can do
Leave clear space around a gas heater; no cartons, solvents or laundry piles. Make sure the relief valve discharge pipe points down toward the floor and is not capped. If you have a carbon monoxide alarm, test it. Those simple habits matter more than any repair.
When replacement is smarter
When the shell itself leaks, no patch will hold. The steel has rusted through and replacement is the only answer. Age matters too. A standard tank tends to give ten to fifteen years, so spending on repairs late in that span seldom pays off. Read water heater lifespan for the signs, then compare options on our gas water heater replacement and tankless pages.
Whatever the outcome, we check venting, the relief valve discharge pipe and the gas connection before we leave.
What is included on the visit
Tools on the truck
- Multimeter for thermocouples and elements
- Hose, pump and descaling kit
- Pipe cutter, press tool and dielectric unions
What we open
Burner access panel, drain valve and the T&P discharge
How we test it
Recovery timing, draft at the hood, soap on every new joint
How the job runs
Ring the line
Say what is dripping, backing up or banging. Water still flowing? We guide your hand to the valve first.
Find the cause
The plumber traces the fault, with a scope or gauge where one earns its keep.
Pick the fix
Options come in everyday language, and nothing starts until you choose.
Repair & prove it
We finish, run the water to prove it, wipe up and leave a short written record.
Calls we field, answered plainly
How do I find the age of my water heater?
Most makers hide the build date inside the serial number. We can decode it during a visit, or the maker's website often explains the format.
Is it safe to relight a pilot myself?
Most tanks have lighting instructions on the label and owners can follow them. If it will not stay lit or you smell gas, stop and call.
Why is the relief valve dripping?
It may be doing its job because pressure or temperature is too high, or the valve itself may be worn. Both need a look; never cap it.