When a hot water tank starts to corrode, it’s only a matter of time before leaks, rust, and cold showers follow. The earlier you spot the warning signs, though, the easier it is to fix the problem and avoid a full tank failure.
Caldwell Plumbing has been helping homeowners across Durham Region keep their water heaters running smoothly since 1979. Here are five early signs of corrosion to watch for, plus some simple ways to extend the life of your hot water tank.
Why Corrosion is a Big Problem for Hot Water Tanks
Hot water tanks are made of steel, and steel doesn’t get along well with water. Over time, the protective lining inside the tank wears down, and the metal begins to rust. Once corrosion takes hold, it spreads quickly.
You can start noticing leaks around the base of the tank or rusty water coming out of your taps, or even have a complete system breakdown on your hands. Corrosion also reduces efficiency, meaning you pay more for energy while getting less hot water in return.
5 Early Signs of Hot Water Tank Corrosion
Here are a few early warning signs that you might need hot water tank replacement.
1. Rusty or Discoloured Water
If you notice brown or reddish water when you turn on the hot tap, it often means the inside of your tank is corroding. This not only affects water quality but can also be a sign that the tank’s lining is failing.
Once rust appears in the water, the problem usually won’t go away on its own, and it’s likely time for water heater replacement.
2. Visible Rust on the Tank Exterior
Corrosion doesn’t just happen inside the tank. Keep an eye out for rust streaks or patches on the outside of the unit, especially near seams, valves, or pipe connections. These weak spots can turn into leaks that spread quickly once the metal gives way.
3. Strange Noises Coming From the Tank
Rumbling, popping, or crackling sounds are often caused by sediment that has settled at the bottom of the tank.
As water heats up, the sediment hardens and creates stress on the tank walls. This buildup contributes to internal corrosion and can shorten the lifespan of your system.
4. Water Around the Base of the Tank
Even a small puddle under your hot water tank is a big red flag. Moisture at the base can point to corrosion eating through the tank from the inside.
Some leaks start small but grow fast, so it’s important to call a professional plumber for water heater repair as soon as you spot puddles on the floor.
5. Inconsistent Hot Water Supply
If your showers are suddenly lukewarm or your tank takes longer than usual to reheat, corrosion could be part of the problem.
Rust and sediment reduce your tank’s efficiency, forcing the system to work harder while lowering the temperature of your water heater.
Maintenance Tips to Extend Your Hot Water Tank’s Life
Corrosion can’t always be stopped, but you can slow it down with simple maintenance habits:
- Flush the tank annually to clear out sediment before it hardens.
- Check the anode rod every few years. This rod attracts corrosion and protects the tank lining, but it wears out over time.
- Look for leaks or rust spots during routine checks.
- Schedule plumbing maintenance once a year. A licensed plumber can catch small issues before they become expensive repairs.
When to Repair vs. Replace Your Water Heater
Not every hot water tank problem means it’s time for a new unit. Minor issues like valve replacements or thermostat adjustments can often be fixed with a quick repair.
Here’s a good rule of thumb:
- Repair if the tank is less than 10 years old and the corrosion is minor.
- Replace if the tank is 10–12 years old, leaking, or showing widespread rust.
At Caldwell Plumbing, we provide honest advice and upfront estimates so you know exactly what’s worth fixing and when it’s smarter to upgrade.
Protect Your Home With Expert Water Heater Service in Durham Region
A hot water tank doesn’t often fail out of nowhere. Corrosion builds slowly, showing signs that many homeowners overlook until it’s too late.
By learning what to watch for and staying on top of maintenance, you can save money, prevent leaks, and enjoy reliable hot water for years to come.
Contact us Today
Caldwell Plumbing has been serving families in Pickering, Ajax, Whitby, Oshawa, and the surrounding Durham Region since 1979. Our licensed plumbers are here for everything from hot water tank repair to the installation of new, energy-efficient water heaters.
Contact us today to schedule an inspection or request a free estimate.
Frequently Asked Questions
Small repairs, like replacing valves or heating elements, usually cost far less than replacing the unit. The exact price depends on the part and labour, and we always provide an upfront estimate.
Yes, though tankless systems are less prone to large-scale rust since they don’t store water. They can still develop mineral buildup or corrosion in heat exchangers without proper maintenance.
Yes, we do. Caldwell Plumbing handles the safe removal and disposal of your old hot water tank as part of the replacement service.
Simple steps like flushing the tank once a year and checking for leaks or rust spots can be done at home. For anode rod inspections and full servicing, it’s best to call a licensed plumber.
