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On Demand Tankless Water Heater Repair

Expert repair services for endless hot water systems

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604-603-1800

An on-demand tankless water heater (sometimes called an instant hot water heater) is a high-efficiency system that heats water only when you need it, instead of storing hot water in a tank. Unlike traditional storage tank heaters, it doesn’t keep 40–60 gallons of water hot all day, which saves energy and provides endless hot water.

How It Works

1. Water Demand Starts

When you turn on a hot water tap, shower, or appliance, cold water flows into the tankless heater.

2. Activation

A flow sensor detects the water movement and signals the unit to start heating.

3. Heating Process

  • Powerful gas burners or electric heating elements instantly heat the water as it passes through a heat exchanger
  • Because water is heated 'on demand,' there's no need for storage tanks or standby heating

4. Delivery

Within seconds, hot water flows directly to your faucet, shower, or appliance — for as long as you need it.

5. Shutoff

When the hot water tap is turned off, the unit stops heating immediately, conserving energy.

Benefits

  • Endless hot water – never run out, even during long showers
  • Energy efficiency – no standby energy loss from reheating stored water
  • Compact design – wall-mounted units save valuable floor space
  • Long lifespan – typically last longer than tank-style heaters (20+ years with proper maintenance)
  • Cleaner water – no rusty tank storing water

Perfect For:

  • Homes with high hot water demand (multiple showers running).
  • Smaller homes/condos that need space-saving solutions.
  • Environmentally conscious homeowners looking to cut energy bills.

Homeowner Troubleshooting

No Hot Water

  • Check if the unit has power (breaker/fuse or power switch)
  • Confirm gas supply is on (for gas units)
  • Clean faucet aerators or showerheads if water flow seems weak
  • If still no hot water, a sensor, ignition, or burner issue may require a technician

Water Not Hot Enough / Fluctuating Temperatures

  • Verify temperature setting on the control panel (usually 120°F is recommended)
  • Clean inlet water filter (often gets clogged with sediment)
  • Check for too many appliances/showers running at the same time — tankless units have a flow limit

System Shuts Off Mid-Use

  • Ensure adequate gas supply and venting (restricted airflow can cause shutdown)
  • Check for error codes on the digital display
  • May indicate overheating, clogged vent, or failing sensor

Strange Noises (popping, rumbling, whistling)

  • Mineral buildup inside the heat exchanger may be the cause → unit may need descaling
  • Loose or blocked venting can also create noise

Error Code on Display

  • E1/E2: Ignition or flame failure (gas issue)
  • E3: Overheating or blocked vent
  • E5/E6: Water flow sensor error
  • Try resetting the unit after checking basics (gas, power, water supply)
  • If codes persist, service is needed
  • When your tankless water heater isn’t working properly, our goal is to get it running safely, efficiently, and reliably again. Here’s what you can expect when we come to repair your unit:
  • When your tankless water heater isn’t working properly, our goal is to get it running safely, efficiently, and reliably again. Here’s what you can expect when we come to repair your unit:

What We Do During a Repair Visit

1. Inspection & Diagnosis

  • Check the basics — power, gas, and water supply
  • Run the system to see what's happening (no hot water, error codes, strange noises, etc.)
  • Use tools and experience to pinpoint the exact problem

2. Cleaning & Maintenance

  • Remove and clean the inlet water filter (often clogged with sediment)
  • If needed, flush and descale the heat exchanger to clear out mineral buildup
  • Inspect venting and ensure the air supply is clear

3. Repair or Part Replacement

  • Replace parts such as the ignition system, flame sensor, temperature sensor, or flow sensor
  • Repair leaks, secure connections, or replace worn seals

4. System Testing

  • After the repair, we restart the system and test the hot water flow.
  • We confirm that water is heating consistently, the temperature is correct, and no error codes remain.
  • Finally, we walk you through what was done and give tips for preventing future issues.

The End Result

  • Reliable hot water on demand
  • Better efficiency (no wasted energy)
  • Peace of mind knowing your system is safe and professionally serviced

Why Choose Skyra Heating & Cooling?

  • Full HVAC services in one place
  • Experienced, serving the community for more than 15 years
  • Certified, reliable technicians
  • Local expertise tailored to B.C. homes & businesses
  • Helped many customers with rebates
  • FREE on-site estimates
  • Fortis Ally Member and in good standing with Home Performance Contractor Network
  • BBB accredited
  • Honest pricing & 24/7 support

Choosing the right team for your heating, cooling, and plumbing needs makes all the difference. At Skyra Heating & Cooling Ltd., we combine years of experience with a commitment to quality service and honest advice. From installations to emergency repairs, we’re here 24/7 to keep your home or business comfortable, efficient, and worry-free. With us, you get more than just service — you get a trusted partner dedicated to your comfort.

Ready to Get Started?

Contact us today for expert service and a free estimate on your HVAC needs.

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604-603-1800