Tankless Water Heater Installation & Repair in Orange County

What is tankless water heater service?

Tankless water heater service is the repair, descaling and installation of on-demand water heaters that heat water only as it flows. Done-Rite Plumbing & Rooter installs and repairs tankless units across Orange County.

Is your tankless water heater delivering icy blasts instead of endless hot water, flashing puzzling error codes or making strange banging noises? Those are clear signals that your system needs professional attention. Done-Rite Plumbing & Rooter is ready to diagnose and fix these problems quickly and get your hot water flowing reliably again.

What are the signs a tankless water heater needs service?

The five main signs are cold bursts or inconsistent hot water, error codes on the display, weaker hot water flow, banging or popping noises and visible leaks around the unit.

Why does my tankless water heater send cold bursts?

Cold bursts often point to flow sensor issues, a clogged heat exchanger, or a unit struggling to hold temperature because of scaling or a faulty igniter.

You're in the middle of a shower or washing dishes, and the hot water suddenly turns cold, then maybe warms up again, or just stays chilly. Beyond the discomfort, inconsistent heating can be a symptom of internal damage or heavy mineral buildup, which shortens the unit's lifespan and hurts its efficiency.

What do tankless error codes mean?

Tankless error codes are diagnostic signals from the unit's internal computer. The codes point to specific malfunctions such as igniter failure, gas supply issues or exhaust blockages.

A series of numbers or letters flashes on the display, often along with a complete lack of hot water. Ignoring an error code means ignoring the underlying mechanical or electrical problem, which can lead to more damage, costly repairs or safety hazards.

Why is my hot water flow weaker than before?

Reduced hot water flow is a classic sign of mineral buildup, called scaling, inside the heat exchanger or in the hot water lines.

The shower stream isn't as strong as it used to be, or it takes longer to fill a sink or tub, even though the water is hot. Reduced flow means the tankless unit is struggling, getting less efficient, using more energy and wearing out faster.

Why is my tankless water heater banging?

Banging or popping from a tankless water heater usually means scale inside the heat exchanger, where trapped water boils rapidly. Gurgling or whistling can also come from internal stress or blockages.

The noises are most common while the unit is heating. Running the unit in that condition can damage critical components.

Why is my tankless water heater leaking?

Tankless leaks can come from loose connections, worn seals, cracks in the heat exchanger from thermal stress, or a failed pressure relief valve.

You may spot drips, puddles or corrosion around the base of the unit, near the water connections or coming from the casing. Any water leak can lead to water damage, mold growth and harm to the unit's electrical components.

What causes tankless water heater problems?

Tankless water heater problems usually come from mineral scale, improper installation or sizing, gas supply or venting issues, and igniter or sensor failures. Scale is a very common cause.

Our guide to how tankless water heaters work explains the parts involved.

How does scale affect a tankless unit?

Scale forms when hard water is heated inside a tankless unit. Minerals like calcium and magnesium drop out and coat the inside of the heat exchanger and pipes.

Regular descaling or flushing is crucial for a tankless water heater. In severe cases, component replacement may be necessary.

How can installation or sizing cause problems?

A tankless unit installed without attention to the home's hot water demand, gas line capacity or venting can struggle from day one.

• Undersized unit: An undersized unit constantly struggles to keep up, which leads to inconsistent hot water.
• Undersized gas line: An undersized gas line can starve the unit of fuel.
• Improper venting: Improper venting can cause the unit to shut down for safety.

Our technicians perform a thorough assessment to confirm the unit is properly matched to your home.

How do gas supply and venting affect a tankless unit?

Gas tankless water heaters need a strong, consistent gas supply and proper exhaust venting. A blocked vent, an undersized gas line or a bad gas valve can keep the unit from firing up.

Done-Rite inspects gas pressure and volume, checks for obstructions in the exhaust vent, and tests the unit's ignition and safety controls so the unit runs efficiently and safely.

What happens when an igniter or sensor fails?

When an igniter or sensor fails, the tankless unit can't heat water or shuts down as a safety measure. The igniter lights the gas, and sensors for flow, temperature and flame monitor operation.

Our diagnosis includes testing the electrical components and sensors. Replacing a faulty igniter, flame sensor or thermistor is a common repair.

What happens during a Done-Rite tankless service visit?

A Done-Rite tankless service visit starts with your symptoms, then a full diagnostic inspection. There is no trip charge, and you get clear, upfront options and pricing before any repair.

1. Listen: We listen to your concerns and symptoms to get a clear picture of the problem.
2. Inspect: We run a full diagnostic inspection, checking for error codes, examining connections, assessing gas and water flow, and looking for any signs of leaks or corrosion.
3. Explain: We identify the root cause, explain the issue in plain language and present your options.
4. Fix: Our goal is always a lasting solution, whether that's a critical repair or a new, energy-efficient installation.

Our labor is backed by a 1 year minimum warranty.

What should you know about a new tankless installation?

Done-Rite installs Navien, Noritz and Rinnai tankless water heaters, sized to your home's specific demands for efficiency and steady hot water. A tankless installation typically runs $4,000 to $6,000 installed.

We pull the permit when one is required. Proper sizing is what keeps hot water steady for years to come. For a look at how the three brands differ, see Navien vs. Noritz vs. Rinnai.

Can tankless trouble point to other plumbing needs?

Yes. Hard water that scales a tankless unit may also affect fixtures and drains, and problems with the main water supply may call for water treatment as a long-term solution.

If hard water is causing heavy scaling in the tankless unit, a thorough drain cleaning can help the rest of the system. If we identify issues with the main water supply that contribute to the water heater problems, water treatment options could provide a long-term solution.

How do you get your tankless water heater running right?

Call Done-Rite Plumbing & Rooter at (714) 605-2950 or contact Done-Rite Plumbing & Rooter today to schedule tankless water heater repair or installation.

A malfunctioning tankless water heater doesn't have to disrupt your daily routine or inflate your energy bills. As an independent, family-owned business, Done-Rite Plumbing & Rooter offers professional expertise with personal, friendly service, and we're here to install or repair your tankless water heater.