To fix a tankless water heater, call a licensed plumber or a specialized HVAC technician experienced in tankless systems for proper diagnosis and repair.
When your tankless water heater fails, knowing who to call can save time and money. This guide covers the best professionals for repairs, common issues, and when to seek help.
Who Repairs Tankless Water Heaters?
Different professionals handle tankless water heater issues:
Licensed Plumbers
Most tankless water heater repairs require a licensed plumber. They handle:
- Water line connections
- Leaks and pipe issues
- Gas line connections (for gas models)
- System flushing and descaling
HVAC Technicians
For gas-powered units, HVAC specialists may be needed for:
- Ventilation issues
- Combustion system repairs
- Gas valve replacements
Electricians
Electric tankless heaters sometimes need an electrician for:
- Circuit breaker issues
- Wiring problems
- Electrical component failures
When to Call a Professional
Watch for these warning signs:
| Symptom | Possible Issue | Who to Call |
|---|---|---|
| No hot water | Heating element failure, gas supply issue | Plumber or HVAC tech |
| Fluctuating temperatures | Flow sensor problems, mineral buildup | Plumber |
| Error codes | System malfunction | Manufacturer specialist |
| Leaking water | Pipe or valve failure | Plumber |
Finding the Right Service Provider
Manufacturer-Certified Technicians
For complex repairs, seek technicians certified by your unit’s brand. They have specialized training for specific models like Rinnai or Stiebel Eltron.
Local Plumbing Companies
Many plumbers offer tankless water heater services. Look for:
- Positive reviews for water heater work
- Proper licensing and insurance
- Experience with your specific model
Cost Considerations
Repair costs vary by issue:
- Basic service call: $100-$200
- Flow sensor replacement: $150-$300
- Heating element repair: $200-$500
- Full descaling service: $150-$250
According to HomeAdvisor, the average tankless water heater repair costs $150-$650 nationally.
Preventative Maintenance
Regular maintenance can prevent many issues:
- Annual descaling (more often in hard water areas)
- Filter cleaning every 3-6 months
- Visual inspections for leaks
- Checking for proper ventilation
For maintenance supplies, consider descaling pumps and flush valve kits.
Emergency vs. Non-Emergency Repairs
Emergency (call immediately):
- Gas leaks (smell rotten eggs)
- Major water leaks
- Electrical sparks or smoke
Non-emergency (schedule service):
- Reduced hot water flow
- Minor temperature fluctuations
- Error codes without system shutdown
For complex installations or replacements, Angie’s List recommends getting multiple quotes.
