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Tankless Water Heater Repair in Massapequa, NY

Fast, Expert Diagnostics & Fixes

If your tankless water heater suddenly stops producing hot water, shows an error code, or delivers inconsistent temperatures, you need a technician who specializes in modern tankless technology. At Absolute Air & Power, we provide expert tankless water heater repair services for homeowners in Massapequa, NY, and across Nassau & Suffolk County.

Tankless units require precision troubleshooting — and our licensed technicians have the experience, tools, and training to quickly restore reliable hot water to your home.

We Repair All Tankless Water Heater Brands

Our team services every major tankless manufacturer, including:

Navien
Rinnai
Noritz
Rheem
Bosch
Takagi
Stiebel Eltron
Eemax
EcoSmart

Whether gas or electric, condensing or non-condensing — we can fix it.

Signs Your Tankless Water Heater Needs Repair

Tankless systems are efficient, but they can experience issues that require professional attention.

Call us if you notice:

No hot water

Water temperature fluctuates

Low hot water pressure

Unit shuts off during use

Ignition or burner problems

Ignition or burner problems

Strange noises (clicking, rumbling, or whining)

Leaking water or condensate

Long delays before hot water appears

Exhaust or venting warnings

These symptoms indicate underlying issues that can worsen over time.

Common Tankless Water Heater Problems We Fix

01

Mineral / Scale Buildup

Hard water causes scale inside the heat exchanger, reducing performance and triggering error codes.

Ignition Failure

Caused by dirty burners, faulty ignitors, or gas pressure issues.

02

Flow Sensor Malfunctions

A failing sensor can prevent the heater from firing when water is flowing.

03

04

Blocked Exhaust or Intake

Vent obstructions cause shutdowns and safety alerts.

Flame Failure

Often due to dirty components, poor gas supply, or faulty sensors.

05

Overheating

Triggered by scale buildup, blocked filters, or internal damage.

06

07

Electrical Component Failures

Control boards, sensors, and thermostats can malfunction.

Gas Pressure Issues

Improper gas flow can cause erratic heating or shutdowns.

08

Leaks

Condensate or water leaks require immediate attention to prevent damage.

09

10

Error Codes

Control boards, sensors, and thermostats can malfunction.

Tankless units are complex — DIY fixes often make problems worse. Professional service ensures safe, reliable operation.

Most tankless water heater breakdowns are caused by lack of maintenance.

Our Tankless Water Heater Repair Process

Diagnostic Evaluation

We inspect the system, run tests, review error codes, and determine the root cause.

Clear Repair Options

We provide honest recommendations and upfront pricing.

Professional Repair

We clean, replace, or adjust components using manufacturer-approved methods.

System Testing

We confirm stable temperature, proper ignition, airflow, and performance.

Preventive Recommendations

We identify issues that may cause future breakdowns, including maintenance needs.

You’ll know exactly what went wrong — and how we fixed it.

Emergency Tankless Water Heater Repair

If your home has no hot water or your tankless system displays urgent error codes,
we offer emergency repair services to restore functionality quickly.

Your comfort is our priority.

Protect Your Investment with Preventive Maintenance

Most tankless water heater breakdowns are caused by lack of maintenance.

Annual service prevents:

Scale buildup

Error codes

Burner failure

Overheating

Sensor malfunctions

Premature heat exchanger damage

We strongly recommend annual descaling and system cleaning for all tankless units — especially in Long Island’s hard-water areas.

Ask about our Tankless Maintenance Plan for priority service and discounted repairs.

Repair or Replace — What’s the Best Choice?

We always try to repair first, but sometimes replacement is more cost-effective.

Repair is usually best when:

Replacement may be the better option when:

We’ll walk you through all options honestly — no pressure.

Why Choose Absolute Air & Power for Tankless Repair?

Homeowners across Long Island trust us because we offer:

We keep your hot water reliable and your system operating safely.

What Our Clients Say

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kelly schneid profile picture
kelly schneid
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Tommy is the best! Life saver. Corrected a messed up system on the hottest weeks of the year!
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Debra Rohl profile picture
Debra Rohl
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Absolute Air & Power did an outstanding job on the installation of my replacement air conditioning system. We have been using them for over 10 years. Tom and his team were great to work with. The technicians were professional, worked efficiently, and made sure everything was cleaned up before they left. Tom took the time to answer all my questions. Highly recommend Absolute Air & Power for anyone looking for quality workmanship and reliable service.
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Terry Moynihan profile picture
Terry Moynihan
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A day after we closed on our house at the end of June, our central air unit crashed out. I called Tom that afternoon and he came first thing the next morning. Although not great news having to buy an entirely new central air system, Tom and his team made it happen in less than 5 days - not to mention during a heat wave! Couldn’t recommend them enough, will definitely be using them for future mishaps!
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Christine Thearle profile picture
Christine Thearle
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I am beyond happy with the service I received from Tom and his team at Absolute Air & Power! From the first call I made to set up an estimate, to the estimate, to installation today everything was great! Everyone was professional, worked as a well oiled team and installed central air and a split in my basement. They arrived at 8am and by 3pm, everything was cleaned up and my house was nice and cool! My only regret is not calling them sooner!!
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Kevin McGaheran profile picture
Kevin McGaheran
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100% recommend. Team was organized & professional. Clockwork. So worth the investment. Didn't realize how inefficient the system had been. Thanks fellas.
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Ricky Wong profile picture
Ricky Wong
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I have been using Absolute Air and Power for over 10 years for both my AC and Heating needs. Their yearly service plan is extremely reasonable and worthwhile to keep your system in tip top shape for all the seasons. I've had a new AC system recently installed by Tom and his team -again the work was extremely professional. Working with Tom, his son, team and office managers is a pleasure, and I would highly recommend AAP to anyone with concerns of working with a trustworthy professional HVAC service.
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Adam Menkes profile picture
Adam Menkes
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Responsive, reliable and most of all everything was high quality. I needed a new central air unit and furnace and from the initial appt to the installation, my entire experience exceeded expectations. I don’t highly recommend many companies but this one “absolutely” earned it.
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Margaret Vero profile picture
Margaret Vero
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I want to thank Absolute Air and Power for servicing my AC unit today. They went above and beyond helping me, especially want to thank Samantha who actually went to pick up the part and Tom who installed it. Thank you so much!

Schedule Tankless Water Heater Repair in
Massapequa, NY

Don’t wait for small issues to turn into major damage. If your tankless water heater isn’t performing properly, our expert technicians will restore your hot water quickly and correctly.

Absolute Air & Power — Fast repairs. Reliable hot water. Trusted expertise.

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