Homeowner library · Water heaters
Signs your water heater is failing
A tank usually gives notice before it gives out. Learning the signs helps you plan a replacement instead of facing a cold shower and a puddle by the furnace.
- Rust on the tank
- Water at the base
- Rumbling or popping
- Rusty hot water
- Licensed, insured trade work (details confirmed when you call)
- Diagnosis before anything is cut
- Emergency calls taken
- Etobicoke and the west end
Visible warnings
Rust on the tank or around fittings, water pooling at the base, and corrosion on the relief valve outlet all point to trouble. A leak from the tank body cannot be repaired.
- The rating label on the tank shows when it was built.
Performance warnings
Hot water running out sooner, lukewarm water, or rumbling noises indicate sediment or failing parts. Rusty hot water may come from the tank lining.
- Some issues are repairable; others signal the end.
Planning ahead
If your heater is near or past its expected life, plan a replacement before it leaks. Choose size and type based on your household.
- Rental tanks: contact the rental company.
The T&P valve
The temperature-and-pressure valve on top protects the tank. If it drips or discharges, pressure or temperature may be too high, or the valve may be failing. Never cap or plug it.
- An expansion tank may be needed where the supply has a check valve or regulator on it.
Gas and venting warnings
A smell of gas, soot around the burner, or a yellow flame need immediate attention. Venting problems can release combustion gases.
- Call a professional right away for these.
Electric heater warnings
Only lukewarm water, a tripping reset button or a burning smell point to element or thermostat problems.
Signs to watch for
- Rust on the tank
- Water at the base
- Rumbling or popping
- Rusty hot water
- Hot water runs out quickly