Water heater repair in Scarborough, Durham and the GTA
Most water heater complaints trace back to one of four things: sediment on the bottom of the tank, a spent anode rod, a failed thermostat or element, or an ignition fault on the gas side. Metropolitan Heating and Air Conditioning has worked on tank and tankless heaters, gas and electric, across Scarborough, Durham Region and the GTA since 1979.
Call (416) 283-5698, Monday to Friday 8:00 AM to 4:00 PM.
Shut it down and call if you see these
Most water heater faults can wait for a booked visit. These should not.
- A smell of gas near the appliance. Leave the space and call from outside.
- Water discharging from the temperature and pressure relief valve. The T&P valve is the last line of defence against a tank running above its rated pressure or temperature. If it is weeping or dumping, either it has failed or something is genuinely over-pressurising the system. Never cap or plug it.
- Water running from the shell of the tank rather than from a fitting. That is the inner tank, and it is not repairable.
- Scorching or soot around a gas unit's burner or draft hood, which points at a venting or combustion problem.
- Water hotter than the thermostat setting, or a unit that will not stop heating.
Sediment is behind more faults than anything else
Dissolved minerals drop out as the water heats and settle on the bottom of the tank. On a gas heater that layer sits between the burner and the water, so the burner drives heat through an insulating crust. Water trapped underneath flashes to steam and escapes through it, which is the rumbling and popping people describe.
The effects compound. The tank floor overheats, stressing the glass lining. Recovery slows, so you run out of hot water sooner. On electric units, sediment builds around the lower element and burns it out. A flush removes the accumulation, and on a tank that has never had one it is often the most useful single thing that can be done. Tankless units suffer the same chemistry as scale in the heat exchanger, and are descaled rather than flushed.
Not enough hot water, or none at all
If the volume dropped gradually, suspect sediment eating into usable capacity, a dip tube that has broken down and is letting cold water short-circuit to the outlet, or demand that has grown past what the tank was sized for.
If it stopped suddenly, it is a component. On electric heaters that usually means a failed element or thermostat, or a tripped high limit — and a high limit that trips again is telling you something, not asking to be reset twice. On gas heaters it is usually the thermocouple, the pilot or igniter assembly, the gas control valve, or a venting problem the safety switch is responding to.
Rusty or smelly water, and the anode rod
A steel tank survives because a sacrificial anode rod corrodes in its place. Once that rod is consumed the tank itself starts to go, and rusty hot water is often the first visible sign. Replacing a spent rod on a tank that is otherwise sound can add years; replacing it once the tank has perforated cannot.
A rotten-egg smell in the hot water only is a different mechanism — a reaction between the anode and sulphur-reducing bacteria. It is addressed by sanitising the tank and changing the anode material, not removing it.
Where a leak is coming from decides everything
Not every puddle means a dead water heater. Leaks at the inlet and outlet connections, the drain valve, the T&P valve or its discharge pipe are fittings, and fittings are replaceable. Condensation on a gas unit during heavy draw can also look like a leak.
A leak from the body of the tank is a different matter: the lining has failed, the steel is perforated, and no repair puts that back.
Repair or replace
A water heater with one identifiable fault and a sound tank is worth repairing. That changes once the tank itself is leaking, or the unit is near the end of its expected life and facing a significant repair. We price both paths rather than steer you, and replacement is the honest answer more often here than elsewhere, because a perforated tank has no repair. Financing is available through Vista.
Book a water heater repair
Call (416) 283-5698 weekdays between 8:00 AM and 4:00 PM, or send us the details. Have the make, model and age from the label, and whether it is gas or electric, tank or tankless. See also all water heater services and our maintenance plans. Licensed and insured, all makes and models, from our shop on Venture Drive in Scarborough since 1979.