Connor Warren, AquaTec Plumbing, February 3, 2026, 4 min read
A water heater is one of those appliances you don't think about, until it stops working properly. Most residential tank water heaters last somewhere between 8 and 12 years, and tankless units can last longer with proper maintenance. But age isn't the only thing that matters. Here are five signs we look for when deciding whether a water heater can be repaired, or whether it's time for a replacement.
If your showers are running lukewarm or cold faster than they used to, your heater may be struggling to keep up with demand. This can be caused by a failing heating element, sediment buildup reducing tank capacity, or a unit that's simply undersized for your household's current needs.
Rust-coloured water coming from your hot taps, but not your cold ones, usually points to corrosion inside the tank itself. Once a tank starts rusting from the inside, it's typically a matter of time before it leaks, and at that point repair isn't a realistic option.
Rumbling, popping, or banging sounds are often caused by sediment (minerals from hard water) that has built up and hardened at the bottom of the tank. This buildup makes your heater work harder (driving up energy bills) and can shorten its lifespan considerably.
Water at the base is not always the tank. Find where it starts. A drip from the pipe running down from the temperature and pressure relief valve means the valve is releasing heat or pressure; never cap or plug it, and have the thermostat and expansion tank checked. A drip from the drain valve near the bottom or from a fitting on top is a repair. On gas units, a little condensation right after a big hot-water draw can also show up.
Water weeping from the jacket or a seam with none of those sources is the tank itself. A tank that has rusted through needs replacing, because a full rupture can put well over a hundred litres on your floor in minutes.
As water heaters age, they lose efficiency, meaning they use more energy to do the same job. If your utility bills are creeping up and nothing else in your home has changed, your water heater could be the culprit.
Municipal water across most of York Region is hard. When it is heated, minerals drop out as sediment and settle on the bottom of the tank. That is the rumbling in sign 3, and it is why heaters in untreated homes tend to wear out early. Flushing the tank once a year slows the buildup. A water softener ahead of the heater prevents most of it, and when a heater has failed young we check the hardness before recommending a replacement.
Many Ontario homes rent their water heater instead of owning it. Look for a rental company's sticker on the tank or a monthly charge on your bill. If it is a rental, your agreement usually says who handles repairs and what a buyout or replacement involves, so read it first. If you own the unit, the rest of this article applies.
If your unit is younger than eight years and the issue is isolated, like a faulty thermostat or heating element, repair is often the right call. But if your tank is older, showing signs of corrosion, or repairs are becoming frequent, replacing it with a properly sized tank or tankless system will usually save you money and headaches in the long run. We'll always give you an honest assessment and the most cost-effective option, not just the most expensive one.
Talk to a real local plumber, call or book online and we'll take it from here.
