Conventional tank water heaters are built to last, but like any mechanical system, they develop problems over time. Some issues are minor and inexpensive to fix. Others are warning signs of a more serious failure. Here is what to watch for:

No Hot Water at All

If you are getting no hot water whatsoever, the most common culprits are a failed heating element (electric units), a faulty thermostat, a tripped circuit breaker, or a pilot light that has gone out (gas units). In some cases, a failed gas valve or a broken igniter is responsible. This is one of the most urgent repair calls we receive, and in many cases our technicians can restore hot water the same day.

Lukewarm or Inconsistent Water Temperature

Water that never gets fully hot, or that fluctuates between warm and cold, usually points to a failing thermostat, a worn lower heating element (electric), a broken dip tube allowing cold water to mix with stored hot water, or sediment buildup at the bottom of the tank insulating the burner from the water above it.

Running Out of Hot Water Too Quickly

If your tank used to comfortably handle your household's demand but now runs out faster than it used to, sediment buildup is often the cause — it reduces the effective capacity of the tank and slows the heating process. A deteriorating lower heating element or a failing thermostat can also reduce your tank's ability to maintain a full supply of hot water.

Rumbling, Popping, or Banging Noises

Unusual sounds coming from your water heater — particularly rumbling or popping — are almost always caused by hardened sediment at the bottom of the tank. As the burner heats water trapped beneath the sediment layer, it creates steam bubbles that force their way through, producing that distinctive noise. Left unaddressed, this reduces efficiency, accelerates wear on the tank lining, and shortens the unit's lifespan.

Discoloured or Rusty Hot Water

Brown, red, or rusty-coloured hot water typically indicates one of two things: a depleted anode rod that is no longer protecting the tank's interior from corrosion, or a tank that has already begun to rust internally. If caught early, replacing the anode rod can resolve the problem. If the tank itself is corroding, replacement is the only reliable solution.

Water Leaking Around the Tank

A leak is never something to ignore. Depending on where the water is coming from, the cause could range from a loose inlet or outlet connection (easily repaired) to a faulty T&P relief valve (a critical safety component requiring immediate attention) to an internal tank failure (which requires full replacement). If you notice pooling water or moisture around your water heater, call us immediately.

Pilot Light Won't Stay Lit (Gas Units)

A pilot light that repeatedly goes out or refuses to ignite often points to a faulty thermocouple — the safety sensor that keeps the gas valve open when the pilot is burning. This is one of the most common gas water heater repairs and is typically straightforward for a licensed technician to resolve.

T&P Valve Releasing Pressure or Dripping

The temperature and pressure relief valve is a critical safety device. If it is constantly dripping or has opened to release pressure, do not ignore it. This can signal that the tank is overheating or that internal pressure is exceeding safe levels. A dripping T&P valve may simply need replacement, but the underlying cause must always be investigated to rule out a more serious issue.

Here is a breakdown of the most frequent conventional tank water heater repairs our technicians perform across Ontario, along with typical cost estimates:

Estimates include parts and labour and are typical ranges for Ontario. Exact costs depend on your unit's make, model, age, and location. Our technicians provide a written quote before beginning any repair.

One of the first questions our technicians answer during every service call is whether a repair makes financial sense or whether replacement is the smarter investment. Here is a practical framework to help you think it through:

Our technicians will always give you a straight, honest assessment. We will never recommend a replacement when a repair is the right call — and we will never push a repair when your money is better spent on a new unit. You get the facts, and you make the decision.

We keep our repair process simple and transparent so you always know what to expect:

1. Call us anytime at 1-888-675-5907 — Our team is available 24 hours a day, 7 days a week, including holidays. Describe your issue and we will dispatch a licensed technician to your home as quickly as possible.
2. Diagnostic inspection — Our technician will perform a thorough inspection of your unit, identify the root cause of the problem, and explain the findings to you in plain language.
3. Written quote before any work begins — We provide a clear, upfront quote covering all parts and labour. No surprises, no hidden fees.
4. Repair or replacement recommendation — If repair is the right answer, we carry common parts on our service vehicles and can often complete the job the same visit. If replacement makes more sense, we will present your options and can arrange a same-day or next-day installation in most cases.
5. Post-repair check and cleanup — Before leaving, our technician will confirm the unit is operating correctly, test the safety systems, and leave your space clean.

Most water heater issues are urgent but not dangerous. However, a few situations require you to act immediately and treat the problem as an emergency:

• You smell gas near your water heater — Do not attempt to relight the pilot or investigate. Leave the home, do not use any electrical switches, and call your gas utility's emergency line and then call us.
• The tank is actively leaking water — Shut off the cold water supply valve to the tank and call us immediately. A significant leak can cause serious water damage quickly.
• The T&P valve is continuously releasing hot water or steam — This indicates the tank may be dangerously over-pressurized. Shut off power or gas to the unit and call us right away.
• You hear a loud bang or popping sound followed by a sudden loss of hot water — This can signal a serious internal failure. Turn off the unit and call for emergency service.

In any of these situations, call Constant Home Comfort immediately at 1-888-675-5907. We are available 24/7 for emergency dispatch across Ontario.

• Available 24/7, 365 days a year — nights, weekends, and holidays included
• Licensed and experienced technicians trained on all major conventional tank brands and models
• Transparent pricing — written quote before any work begins, no hidden fees
• Honest repair-vs-replace recommendations with no upselling pressure
• Parts stocked on service vehicles for fast, same-visit repairs whenever possible
• Access to same-day or next-day replacement installation when needed
• Trusted by thousands of Ontario homeowners across the GTA and beyond

The most cost-effective repair is the one you never have to make. Most conventional tank water heater breakdowns are preventable with routine annual servicing. Constant Home Comfort's Water Heater Maintenance Plan includes:

• Annual inspection by a licensed technician
• Tank flush to remove sediment buildup
• Anode rod inspection and replacement when needed
• T&P valve safety test
• Burner and venting check (gas units)
• Early identification of wear and components approaching end of life

Homeowners on our maintenance plan experience fewer emergency breakdowns, lower energy bills, and longer unit lifespans. Ask your technician about enrolling when you call.

Constant Home Comfort provides 24/7 conventional tank water heater repair across Ontario, including:

• Greater Toronto Area — Toronto, Markham, Richmond Hill, Vaughan, Mississauga, Scarborough, Newmarket, Etobicoke, North York, Thornhill, Stouffville, Aurora, King City, and surrounding communities
• Durham Region — Oshawa, Whitby, Ajax, Pickering
• Hamilton and Burlington
• Ottawa and Kanata
• London and Waterloo Region
• Barrie
• All of Ontario — call us to confirm same-day availability in your area

Call 1-888-675-5907 anytime — day or night — and we will get a technician to you as fast as possible.

How quickly can a technician arrive for an emergency water heater repair?

We prioritize emergency calls and aim to have a technician at your door as quickly as possible — often within a few hours, depending on your location and time of call. Our 24/7 dispatch operates across the GTA and all of our Ontario service areas.

Can I still use hot water while waiting for a repair?

It depends on the nature of the problem. If your unit is leaking, you should shut off the cold water supply to the tank. If there is a gas smell, do not use any appliances and leave the home. For issues like inconsistent temperature or reduced hot water, the unit is generally safe to continue using until the technician arrives — but call us first and we will advise you based on your specific situation.

My pilot light keeps going out. Is that a dangerous problem?

A pilot light that repeatedly goes out is usually caused by a faulty thermocouple, which is a common and straightforward repair. While not immediately dangerous in most cases, it does leave you without hot water and should be addressed promptly by a licensed technician. Do not attempt to repeatedly relight the pilot if it continues to go out — call us for a proper diagnosis.

How much does a water heater repair cost in Ontario?

Most conventional tank repairs in Ontario range from $100 to $450 depending on the issue and parts required. Our technicians provide a written upfront quote before any work begins so you are never caught off guard. See the repair cost table above for a breakdown by repair type.

What should I do if my water heater is leaking?

First, turn off the cold water supply valve at the top of the tank to stop more water from flowing in. If the unit is gas, turn the thermostat to the Pilot setting. If it is electric, switch off the breaker for the water heater. Then call us immediately at 1-888-675-5907. Do not attempt to repair a leaking tank yourself — leaks can indicate internal damage, faulty connections, or a failing T&P valve, all of which require a licensed technician.

Does Constant Home Comfort offer a warranty on repairs?

Yes. All repairs carried out by Constant Home Comfort come with a warranty on parts and labour. Your technician will provide details specific to the work performed during your service call.