No Hot Water in London, ON? 4 Common Water Heater Problems & Fixes
Don't panic. Our expert guide walks you through the 4 most common water heater problems so you can get your hot water back, fast.
⚠️ SAFETY FIRST: GAS SMELL OR LEAKING TANK
If you smell gas (rotten eggs) — evacuate immediately and call Enbridge at 1-866-763-5427 from a safe location. If your water heater is leaking — shut off the water supply and call for emergency service immediately. A leaking tank can burst and cause $10,000-$50,000 in water damage.
There's nothing worse than turning on the tap for a warm shower and getting an icy blast instead. If you have no hot water, it's a major disruption. Before you worry, Hawana HVAC has a list of common issues that London homeowners face, from simple fixes to problems requiring professional water heater repair. Follow this guide to troubleshoot — but when in doubt, call a TSSA-certified professional.
Troubleshooting Your Water Heater in London, Ontario
The Pilot Light is Out (Gas Heaters)
For conventional gas water heaters, the pilot light is a small, continuously burning flame that ignites the main burner when needed. If it goes out, your water won't heat up. You can often see the flame through a small window at the bottom of the tank.
What to do: The instructions for relighting are usually on a label on the tank. However, if you are not comfortable doing this, or if you smell gas, DO NOT proceed.
Safety First: If you smell gas, leave your home immediately and call your gas utility (Enbridge). If the pilot light won't stay lit after relighting, it's a sign of a deeper issue like a faulty thermocouple, and you need a TSSA-certified technician.
Tripped Circuit Breaker (Electric Heaters)
If you have an electric water heater, the solution could be as simple as a tripped breaker. Electric heaters use a lot of power and are often on a dedicated circuit.
What to do: Find your home's electrical panel. Look for a double-pole breaker labeled "Water Heater" or similar. If it's in the 'off' position or in the middle, switch it completely off and then back on again.
When to Call Us: If the breaker trips again immediately, there's an electrical fault within the heater, like a bad heating element or thermostat. Do not keep resetting it. Call for professional service.
Faulty Thermocouple or Gas Control Valve
The thermocouple is a safety device that shuts off the gas if the pilot light goes out. When it fails, it will shut off the gas even if the pilot is lit, preventing the burner from igniting. This is one of the most common reasons for a pilot light that won't stay lit.
What to do: This repair is not a DIY job and requires a licensed TSSA-certified professional. We can diagnose and replace a faulty thermocouple ($150-$250) or gas control valve ($400-$700) quickly.
A Leaking Water Tank
Puddles or water stains around your water heater are a serious warning sign. While a leak could come from a fitting, it often indicates corrosion and internal failure of the tank itself. A leaking tank cannot be repaired and is at risk of bursting, causing major water damage.
Action: If you see water pooling, immediately shut off the water supply to the tank and call for emergency water heater repair. Do not wait — even a small leak can become catastrophic within hours.
Abdullah Ghzail – Owner & Lead TSSA-Certified HVAC Specialist
"After hundreds of water heater repairs across London, the most heartbreaking calls are when a tank fails catastrophically and floods a finished basement. Here's my honest advice: if your water heater is over 10 years old and starts leaking, replace it immediately — don't wait. A new tank costs $2,700-$3,500 installed, which is a fraction of water damage restoration ($10,000-$50,000). And if you're tired of running out of hot water, consider a tankless upgrade — endless hot water, 20+ year lifespan, and 24-34% energy savings. We're here 24/7 for emergencies, zero after-hours surcharge."
What London Homeowners Say About Water Heater Repair
"Woke up to no hot water near Byron — freezing shower! I checked the pilot light like the guide said, but it wouldn't stay lit. Called Hawana at 8 AM. Abdullah came within 2 hours, diagnosed a faulty thermocouple, and replaced it for $180. Hot water was back by lunch. He also flushed the tank and showed us the sediment buildup. Great service, fair price, and the guide helped me troubleshoot before calling."
— Birch K. London ON · October 2025
"Our 12-year-old water heater started leaking near White Oaks. I remembered this guide's warning — shut off the water immediately and called Hawana. Abdullah came within an hour (emergency response). The tank was corroded and beyond repair. He installed a new 50-gallon tank for $3,200 the same day. Professional, fast, and prevented what could have been $20,000 in water damage. This guide saved our basement."
— Stone T. London ON · November 2025
"Our electric water heater kept tripping the breaker near Masonville. The guide said not to keep resetting it — good advice. Abdullah came the next day, found a failed heating element, and replaced it for $250. He also checked the thermostat and flushed the tank. Our hot water is back and the breaker hasn't tripped since. Honest diagnosis, fair price, and he explained everything. Highly recommend Hawana for water heater repair."
— Mist B. London ON · December 2025
Water Heater FAQ — 2026
Repair costs vary depending on the issue: thermocouple replacement ($150-$250); heating element replacement ($200-$350); gas control valve replacement ($400-$700); thermostat replacement ($150-$300); pilot light cleaning ($100-$200). Our diagnostic fee is $175, waived if you proceed with the repair. We provide upfront pricing before any work begins. A simple repair is much cheaper than a full replacement ($2,700-$5,500).
If your water heater is over 8-10 years old and requires a major repair (gas control valve, leaking tank), replacement is often the more cost-effective choice. A new tank water heater costs $2,700-$3,500 installed and will be more energy-efficient. Upgrading to a tankless water heater ($3,500-$5,500) provides endless hot water and 20+ year lifespan. We help you make the right decision based on age, repair cost, and efficiency.
Hawana HVAC offers 24/7 emergency service with zero after-hours surcharge. We prioritize urgent calls like major leaks or no hot water. Typical response times: 45-75 minutes in London, 60-90 minutes in surrounding areas (St. Thomas, Dorchester, Aylmer). We communicate ETAs via text and call when we're 15 minutes out. Don't wait — a leaking tank can cause $10,000-$50,000 in water damage.
If you see water pooling around your water heater: immediately shut off the water supply to the tank (valve on top or main shutoff); turn off the power (breaker for electric, gas valve for gas); call for emergency repair immediately. A leaking tank often indicates internal corrosion and is at risk of bursting, causing major water damage. Do not wait — even a small leak can become catastrophic within hours.
A pilot light that won't stay lit is usually caused by: a faulty thermocouple (most common — $150-$250 repair); dirty pilot orifice; loose electrical connections; or a draft blowing out the flame. If you can relight it but it goes out again when you release the button, the thermocouple is likely bad. This requires a TSSA-certified technician to replace. Never leave a pilot light out — gas could accumulate.
An electric water heater tripping the breaker is usually caused by: a failed heating element (most common — element shorts out); faulty thermostat; loose electrical connections; or water leaking into electrical components. If the breaker trips immediately after resetting, do not keep resetting it — this could cause a fire. Call a professional to diagnose. We can replace heating elements and thermostats quickly.
Standard tank water heaters last 8-12 years with proper maintenance. Tankless water heaters last 20+ years. London's hard water can shorten lifespan — annual flushing removes mineral buildup. Signs of aging: rust-colored water, rumbling noises, leaking, or not heating properly. If your water heater is over 10 years old, start planning for replacement before an emergency failure occurs.
Insufficient hot water can be caused by: sediment buildup in the tank (reduces capacity and efficiency); a faulty heating element (electric) or gas control valve; thermostat set too low; undersized tank for household demand; or a failing dip tube (cold water mixing with hot). If your water is lukewarm or runs out quickly, call for diagnosis. Annual flushing prevents most sediment issues.
If you are comfortable and follow the manufacturer's instructions (usually on a label on the tank), relighting a pilot light is generally safe. However: if you smell gas — DO NOT attempt to relight. Evacuate immediately and call Enbridge from a safe location. If the pilot light won't stay lit after multiple attempts, stop trying and call a TSSA-certified technician. Gas work requires professional expertise for safety.
New water heater installation costs in London: standard tank (40-50 gallon) $2,700-$3,500 installed; high-efficiency tank $3,000-$4,000; tankless water heater (Navien) $3,500-$5,500. Tankless units provide endless hot water, 20+ year lifespan, and 24-34% energy savings. We provide free, no-obligation quotes and handle all permits and removal of your old unit.
Get Your Hot Water Back—Fast!
For reliable, professional water heater repair service in London, Ontario and beyond, count on the certified experts at Hawana HVAC. We're here 24/7 to help with zero after-hours surcharge.
📞 (647) 550-4220 — 24/7 Emergency Line
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