FREE On-Site Estimates
We Come To Your Home or Business For $0 Out of Pocket
Jilly Logo 1
Jilly Plumbing 750px IMG7799

Tankless Water Heater Repair

Introduction to Tankless Water Heaters

Tankless water heaters, also known as on-demand or instant water heaters, have become increasingly popular in recent years due to their energy efficiency and space-saving design. So Tankless Water Heater Repair is something that you may need.

How Tankless Water Heaters Work

Tankless water heaters heat water directly as it flows through the unit, eliminating the need for a storage tank. When you turn on a hot water tap, cold water travels through a pipe and into the heater, where either a gas burner or an electric element heats the water. This provides a continuous supply of hot water, ensuring you never run out of hot water during a shower or while washing dishes.

Benefits of Tankless Water Heaters

These modern water heaters offer several advantages, including:

  • Energy efficiency: Because they only heat water as needed, they can save up to 50% on energy costs compared to traditional water heaters.
  • Space-saving: Their compact design frees up valuable storage space in your home.
  • Longer lifespan: With proper maintenance, tankless water heaters can last up to 20 years, compared to the 10-15 year lifespan of traditional tank water heaters.

Common Tankless Water Heater Problems

While tankless water heaters offer numerous benefits, they can still encounter issues. Here are some common problems and their potential causes:

No Hot Water

If your tankless water heater isn’t producing any hot water, it could be due to:

  1. A tripped circuit breaker or blown fuse
  2. A faulty thermostat
  3. A malfunctioning flow sensor or water flow switch

Inconsistent Water Temperature

If the water temperature fluctuates or is not hot enough, possible causes include:

  1. Incorrect thermostat settings
  2. A dirty or clogged water filter
  3. Low gas pressure or a malfunctioning gas valve

Water Heater Leaks

Leaks can result from:

  1. Damaged or loose connections
  2. A damaged heat exchanger
  3. A cracked or damaged valve

Mineral Buildup

Hard water can cause mineral buildup within the heater, leading to:

  1. Reduced efficiency
  2. Overheating
  3. Premature failure of components

Ignition and Flame Failure

These issues can be caused by:

  1. A dirty or clogged burner
  2. A faulty igniter or flame sensor
  3. Insufficient gas supply or pressure
Jilly plumbing 1452207740
Jilly Plumbing 528049747

Tankless Water Heater Repair: Diagnosing

Before attempting any repairs, it’s essential to diagnose the problem accurately. Here are some methods to help you pinpoint the issue:

Error Codes

Many tankless water heaters have a digital display that shows error codes when something is wrong. Consult your owner’s manual or the manufacturer’s website to decipher these codes and determine the specific issue.

Visual Inspections

A thorough visual inspection can reveal signs of damage or wear, such as corrosion, loose connections, or leaking water. Be sure to turn off the power supply and gas before inspecting the unit.

Water Flow and Temperature Tests

By testing the water flow and temperature, you can determine if there’s a problem with the heating element or the water flow sensor. If you’re unsure how to perform these tests, consider contacting a professional.

Tankless Water Heater Repair Tips

Once you’ve diagnosed the problem, you can start repairing your tankless water heater. Here are some tips for common repairs:

Flushing the System

To remove mineral buildup, flush the system using a vinegar solution or a descaling agent. Follow the manufacturer’s instructions for the proper procedure, or hire a professional to handle the task.

Replacing Parts

If you need to replace damaged or worn components, such as valves, sensors, or heating elements, make sure to use parts recommended by the manufacturer. This ensures compatibility and helps maintain your unit’s efficiency and lifespan.

Professional Assistance

Some repairs, like working with gas lines or electrical components, can be dangerous for inexperienced individuals. If you’re not confident in your ability to handle a repair, it’s best to call a professional plumber or technician with experience in tankless water heater repair.

Jilly plumbing 1742056838

Preventive Maintenance for Tankless Water Heaters

Regular maintenance can help prevent many issues and extend your tankless water heater’s lifespan. Consider the following preventive measures:

  1. Schedule annual inspections by a professional.
  2. Flush the system at least once a year to prevent mineral buildup.
  3. Clean or replace the water filter regularly.
  4. Ensure proper ventilation and keep the area around the unit clean.


While tankless water heaters are efficient and dependable, they can still encounter problems that require repair. By understanding common issues, diagnosing the problem, and taking the appropriate steps to fix it, you can keep your tankless water heater in peak condition for many years. Remember to perform regular maintenance and seek professional help when needed to ensure the safety and longevity of your investment.


  1. How often should I have my tankless water heater serviced? It’s recommended to schedule a professional inspection and maintenance service annually to keep your unit in optimal condition.
  2. Can I perform tankless water heater repairs myself? While some minor repairs can be done by a handy homeowner, it’s essential to have the necessary skills and knowledge to do so safely. If you’re unsure, it’s best to contact a professional.
  3. What is the average lifespan of a tankless water heater? With proper maintenance, tankless water heaters can last up to 20 years.
  4. How do I know if my tankless water heater needs repair? Signs that your tankless water heater may need repair include no hot water, inconsistent water temperature, leaks, or error codes displayed on the unit.
  5. Can hard water damage my tankless water heater? Yes, hard water can lead to mineral buildup within the unit, reducing efficiency and potentially damaging components. Regular flushing and using a water softener can help prevent these issues.

If you’re experiencing any issues with your tankless water heater, don’t hesitate to contact Jilly Plumbing. Our team of experienced professionals is here to help diagnose and repair your tankless water heater quickly and efficiently. Call us today or visit our website to schedule an appointment and ensure your tankless water heater stays in top shape. With Jilly Plumbing, you can trust that you’re in good hands!

Skip to content