CJM Plumbing, Heating & AC

Tankless Water Heater Installation and Repair in New Windsor, NY

Q: Why am I getting hot water in some moments and lukewarm water the next?

Inconsistent temperatures often mean the heater is having trouble regulating flow or the heat exchanger needs attention. Mineral buildup is the most common cause, especially in New Windsor’s water conditions. A proper tankless hot water heater repair visit solves these fluctuations and restores a steady temperature.

Q: Why does my tankless heater show error codes all the time?

Error codes appear when sensors detect issues like blocked airflow, scale buildup, low gas supply, or failing components. Ignoring these codes usually leads to a full shutdown. A tankless water heater repair appointment lets us diagnose what the codes mean and fix the problem before it damages the system.

Q: Can a tankless system be repaired, or do I need a replacement?

Most tankless units can be repaired as long as the heat exchanger and major components are still in good condition. Replacement is only needed if the unit is very old or the core components fail. We inspect the system and explain whether a repair or a new tankless water heater installation service is the smarter long-term option.

Q: Why does my tankless heater take longer than expected to deliver hot water?

If hot water is delayed, the system may be struggling with scale, restricted lines, or a circulation issue in the plumbing. Tankless systems are designed for fast response, so slow heating usually means maintenance is overdue. A cleaning and tune-up restores the instant hot water you expect.

Stop dealing with cold showers and waiting minutes for the water to heat. Get a tankless setup that delivers instant, steady hot water every time you turn the tap.

Book an Appointment Today!

Our Tankless Water Heater Services

For hot water that keeps up with real household use and busy commercial demand.

Tankless systems only work the way they’re supposed to when they’re sized correctly, installed properly, and maintained with care. Whether your unit is cutting out, falling behind, or ready to be upgraded, we service and install tankless heaters so you always have the hot water you rely on every day.

Tankless Water
Heater Repair

If your tankless heater keeps cutting out, dropping temperature, or shutting off with error codes, we handle tankless water heater repair and tankless hot water heater repair that fixes the issue at its source. No more sudden cold water, no more mid-shower shutdowns, and no more guessing what the problem is.

Tankless Water
Heater Installation

If your current heater can’t keep up or you’re switching to a tankless system, our tankless water heater installation service sets you up with the right model and proper sizing for steady hot water in daily routines, busy kitchens, equipment use, or multi-fixture homes.

Tankless Water
Heater Maintenance

Scale buildup and clogged components can make a tankless system lose heat or shut down completely. Don’t let a simple maintenance issue take away your hot water. With our maintenance service, your unit stays clean, running properly, and able to deliver hot water without struggling.

Tankless Water
Heater Replacement

If your tankless unit can’t keep up anymore, keeps shutting off, or is costing more to repair than it’s worth, we replace it with a properly sized system that delivers steady hot water for showers, dishes, equipment, and daily use without running out.

About CJM Plumbing, Heating & AC

Trusted by Homes and Businesses That Need Hot Water Without Delays

A tankless water heater should give you steady hot water the moment you turn the tap. When it starts shutting off, flashing codes, or going cold during peak use, it affects everything. Homes lose hot showers and basic routines. Businesses deal with delays, complaints, and equipment that can’t run without hot water.

CJM Plumbing, Heating & AC has been serving New Windsor, Cornwall, and the Hudson Valley since 2013. With three generations of trade experience, solid customer service, and a satisfaction guarantee, we make sure your tankless system is installed and repaired the right way so you aren’t dealing with the same problem twice.

Call us if you’re noticing:

Hot water cutting out mid-use
Water that never gets fully hot
Repeated error codes
Low water pressure during hot water use
System shutting off during showers or cleaning

Schedule Now

CJM-Plumbing,-Heating-&-AC-Plumber-Tankless-Water-Heater-Repair-and-Installation

Enjoy Hot Water on Every Tap With Tankless Repair and Installation That Keeps Up With Your Demand

Losing your hot water supply throws everything off. Showers get ruined, kitchens fall behind, equipment slows down, and your whole routine gets pushed off track. You don’t have to deal with any of that. Book our tankless service and get your hot water restored before it causes another interruption.

Feel Free to Contact Us

Fill Out the Form or Call Us Now

"*" indicates required fields

Tankless Water Heater Service

Backed by Real Experience

CJM Plumbing, Heating & AC has been serving New Windsor, Cornwall, and the Hudson Valley since 2013, helping families and business owners get tankless systems that actually keep up with real demand. Whether your heater needs to be repaired, replaced, or fully upgraded, our team brings hands-on experience, honest guidance, and the kind of careful work that comes from three generations in the trade.

Emergency Help When Hot Water Stops
Family-Owned Team With Real Tankless Expertise

Local Technicians You Can Reach Anytime
Three Generations of Water Heater Experience

Schedule Now

Emergency
Service

We handle urgent tankless failures that can’t wait, offering emergency repair based on technician availability so your property isn’t left without hot water unexpectedly.

Convenient
Scheduling

We plan service around your routine, keeping your property supplied with steady hot water without long delays, stressful interruptions, or downtime during busy daily needs.

Upfront Honest
Pricing

We give clear written pricing before work begins, helping you plan confidently with no hidden fees, surprise add-ons, or unexpected charges affecting your repair budget.

Tankless System Experts

We repair all tankless models in homes and businesses, giving you the correct fix for gas, electric, single-unit, or high-demand systems without guesswork.

Your Tankless Water Heater Questions

Answered Clearly and Without Confusion

Why does my tankless water heater keep shutting off during use?

When a tankless unit cuts out suddenly, it is usually dealing with restricted water flow, mineral buildup inside the heater, or sensors that are struggling to read temperature correctly. These issues keep getting worse as the internal components strain to keep up. Scheduling tankless water heater repair lets us inspect the system, clean the buildup, and stop the shutdowns before they become daily problems.

Why am I getting hot water in some moments and lukewarm water the next?

How often does a tankless system need maintenance?

Tankless units need routine cleaning because minerals collect inside the heat exchanger. Without regular tankless water heater maintenance, the system loses efficiency, the water gets cooler, and the unit becomes more likely to shut down. Most homes need maintenance once a year, and heavy-use homes may need it sooner. A tankless hot water heater maintenance service keeps the unit running smoothly.

Why does my tankless heater show error codes all the time?

Can a tankless system be repaired, or do I need a replacement?

Why does my tankless heater take longer than expected to deliver hot water?

Anne Mineo

17:06 27 Oct 25

I have been a client for several years and multiple repairs/projects. Chris and his team are always prompt, reliable, and fairly priced. CJM Plumbing, Heating & AC are superb in workmanship and superior in integrity.

Lynn Beesecker

22:17 23 Oct 25

As always, reliable and professional.

Angela Giannetta

18:06 23 Oct 25

CJM had to come twice this week. The first time to service our oil burner and the second time, Makaya, came to repair our leaky kitchen sink. Both times the servicemen did a great job - friendly, competent and expedient. I didn't catch the name of the first service person, but Makaya did a great job with our sink. Quick and pleasant --- even whistled while he worked. Literally. LOL. The woman who handles the phone is a great rep, too. Great doing business with this organization.

Mark B

20:27 21 Oct 25

CJM plumbing was very professional and thorough and met all expectations and the job was done efficiently and very friendly crew. From the phone call to start the job until completion. Thanks

Shail Ranavat

14:02 21 Oct 25

Excellent service — prompt, professional, and reliable. Highly recommend for quality plumbing work done efficiently and neatly.

Tankless Water Heater Installation and Repair in New Windsor, NY