Quick Tankless Water Heater Maintenance Guide

Tankless water heaters have become a popular choice for homeowners who want endless hot water, better energy efficiency, and more space in their utility areas. But even though these systems are designed for long-term performance, they aren’t completely maintenance-free.

Just like any other appliance, a little care goes a long way in keeping your water heater running smoothly and efficiently for years to come. In this quick guide, we’ll walk you through what tankless water heater maintenance in Chula Vista, CA, requires, why it matters, and how to keep your system in top shape.

What maintenance is required on a tankless water heater?

One of the main reasons people switch to tankless water heaters is their reliability. Unlike traditional tanks that store water, tankless units heat it on demand, which means fewer risks of leaks or corrosion inside a tank. However, over time, minerals in the water—especially calcium and magnesium—can build up inside the heat exchanger. This mineral buildup, also known as scaling, reduces the system’s efficiency and can eventually cause damage if left unchecked.

Regular maintenance prevents these problems, helps your unit perform better, and keeps your energy bills lower. A well-maintained tankless water heater can easily last 20 years or more, while one that’s neglected might start having issues much sooner.

The good news is that maintaining a tankless water heater isn’t complicated, but it does require consistency. Here are the main tasks that should be part of your maintenance routine:

1. Descaling (Flushing the system)

This is the most important maintenance task for any tankless water heater. Over time, mineral deposits from hard water accumulate inside the heat exchanger, affecting performance. To prevent this, the system should be flushed at least once a year—or every six months if you live in an area with very hard water.

Flushing involves running a vinegar or descaling solution through the heater to break down and remove the mineral buildup. Some homeowners handle this themselves, but hiring a professional plumber ensures the process is done correctly and safely.

2. Cleaning the inlet filter

Tankless systems have a small filter on the cold-water inlet that catches debris before it enters the unit. This filter should be cleaned regularly, ideally every few months. Simply turn off the power and water supply, remove the filter, rinse it under running water, and reinstall it. Keeping this filter clean helps maintain steady water flow and prevents clogging.

3. Inspecting the venting and air supply

Proper airflow is essential for gas-powered tankless water heaters. Over time, dust, debris, or even insects can obstruct vents and intake screens, affecting performance or triggering system errors. Check that the venting pipes are free of blockages and that all connections are secure. If you’re unsure, a licensed technician can do a full inspection as part of your yearly service.

4. Checking the pressure relief valve and gas lines

Every tankless unit includes a pressure relief valve to prevent excess pressure from building up in the system. It’s a good idea to test this valve annually to make sure it’s functioning properly. For gas-powered models, it’s also important to inspect gas lines for leaks or damage. A professional plumber can test for leaks and ensure your unit is operating safely.

How often should you service a tankless water heater?

For most homes, a yearly maintenance schedule is ideal. If you live in an area with hard water or your household uses a lot of hot water, you might want to service it twice a year. Regular maintenance not only helps your heater perform efficiently but also keeps your warranty valid—something many homeowners forget.

Some basic maintenance steps, like cleaning the filter or checking the vents, can easily be done by homeowners. However, descaling and professional inspections are best left to licensed plumbers. They can identify early warning signs of wear, leaks, or electrical issues that you might miss.

Where can I find dependable tankless water heater maintenance in Chula Vista, CA?

Keeping your tankless water heater in top condition is the best way to protect your investment and enjoy years of reliable hot water. If you live near the South Bay area and it’s time to replace your tankless water heater or you simply need expert maintenance, Bob the Plumber is here to help. Our licensed, insured, and bonded team has over 15 years of local experience, offering honest, dependable service that keeps your home running smoothly.

Whether you’re exploring the tankless water heater buying guide, scheduling routine service, or want to learn more about the advantages of having a tankless water heater, our team can walk you through every step—from choosing the right model to professional installation and long-term care.

As a trusted, family-owned business proudly serving San Diego County, we treat every customer like a neighbor. Call us today and experience the comfort, efficiency, and peace of mind that come from working with true local experts.