If your water heater has stopped giving you hot water, you’re probably standing in a cold shower trying to decide whether to call someone or just wait it out. I get this call more than almost any other, and the honest answer is that water heater repair in London Ontario comes down to two things: what’s actually broken, and how old the tank is. Age matters more than most homeowners expect. Water heater repair is one of the plumbing services we handle every day.
The first thing I check on any no-hot-water call
Before I even open up the water heater, I check the mixing valve, if the home has one. I do this by holding the pipes at the top of the tank and feeling for a temperature difference between them. If one pipe is hot and the other is cold, the mixing valve itself may be the problem, not the water heater. This is a quick check that can save you from paying for a water heater repair you don’t actually need.
Why I check the age of the tank before anything else
In London, tank-style water heaters generally last 10 to 15 years. Once a tank passes 10 years old, repairing it becomes a gamble. You can fix the exact problem that brought you in, and the tank itself can still develop a leak the very next day. That’s not a scare tactic, it’s just how tanks age, even with London’s relatively good water quality.
I don’t make that call for you, though. If your water heater is older, I’ll tell you plainly what I’m seeing and what the risk is, and then it’s your decision whether you want a repair or a replacement. I’m not going to push you one way just because a repair is a smaller ticket than a new install.
What water heater repair diagnostics cost in London Ontario
A full diagnostic, gas or electric, runs 120 to 180 dollars. That price includes the dispatch fee, so there’s no separate trip charge stacked on top. It’s a flat cost for me to identify exactly what’s wrong and give you a straight answer, and it stands on its own whether you decide to repair, replace, or do nothing at all. That’s what an honest water heater repair diagnostic should look like: no pressure toward one outcome over the other.
Electric water heater repair: what usually goes wrong
Once age isn’t a factor, the most common electric water heater repair I make is a failed heating element. I’ll open the access panel and test the elements directly. Whether that’s a same-visit fix depends on the specific water heater model and whether I have the right element on the van, since there are a lot of different types out there.
Gas water heater repair: what usually goes wrong
On gas water heaters, a no-hot-water call is usually caused by a dirty flame sensor or igniter assembly. Dust from nearby construction, general household dirt, and pet hair are the most common culprits I find fouling these parts. Sometimes a clean and test solves it on the spot. Other times it points to something in the surrounding area worth addressing so the problem doesn’t come right back. Gas water heaters in Ontario fall under TSSA rules, since it’s the province’s regulator for fuel-burning appliances — which is exactly why I don’t recommend homeowners troubleshoot gas units themselves.
When water heater repair isn’t worth it in London Ontario
I’ll say this plainly: if your tank-style water heater is over 10 years old, water heater repair in London Ontario isn’t something I’d recommend banking on. You can spend the money to fix the issue in front of you and still end up with a leaking tank shortly after. Past that age, replacement is usually the smarter investment, even though repair is always an option if that’s what you’d rather try first.
Frequently asked questions
How much does water heater repair cost in London Ontario.
A diagnostic runs 120 to 180 dollars, including the dispatch fee. Repair costs vary depending on what’s actually wrong and the type of water heater you have.
How long do water heaters last in London Ontario.
Most tank-style water heaters last 10 to 15 years. Past the 10 year mark, repairs become less reliable.
What’s the most common reason a water heater stops producing hot water.
A malfunctioning mixing valve, a failed heating element on electric units, or a dirty flame sensor or igniter on gas units.
Can a mixing valve be mistaken for a water heater problem.
Yes. If one pipe at the top of the tank is hot and the other is cold, the mixing valve may be the actual issue, not the water heater itself.
Should I repair or replace an old water heater.
That’s your call. I’ll give you a straight diagnostic and tell you the real risk of repairing an older tank, but the decision is yours.
Is it normal for water heaters to fail without warning.
Yes, especially past the 10 year mark. A tank can seem fine one day and start leaking the next, regardless of what was just repaired.
If your water heater in London, St. Thomas, or Oxford County has stopped producing hot water, I’m happy to come take a look and give you a straight answer. Book online or give us a call at 226-270-5177.
Aron Oretan is the owner of Triton Home Service, a Licensed Red Seal Plumber and Steamfitter with 26 years in the trade, serving London, St. Thomas, and Oxford County.
