4.8
Based on 7597 reviews
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Complete Tankless Water Heater Services from Universe

Switching to a tankless water heater, often called a continuous water heater, delivers hot water on demand without the limits of a tank.

Universe provides complete tankless water heater services across Long Island:

Universe Home Services offers 24/7 emergency plumbing services when a tankless water heater fails. Contact us today for service anywhere in Nassau and Suffolk County.

(516) 473-0202


Long Island’s Tankless Water Heater Team

Nassau and Suffolk County homeowners call Universe for tankless water heaters because the systems need to be sized, installed, and serviced by a team that understands both the equipment and local water chemistry.

Tankless water heaters have grown in popularity as homeowners look for efficiency and space savings over traditional tank units.

Universe has been installing water heaters across Long Island since 1954 and understands how Nassau County’s hard water affects tankless equipment in particular, where mineral scale on heat exchangers is a real maintenance consideration. Our plumbers size tankless units correctly for household demand and install them to support long service life.

Years in Business

Satisfaction Guaranteed

Emergency Service

Homes Serviced Annually

Why Work With Universe Home Services?

Tankless water heater installation requires a licensed plumber. We perform every job with licensed master plumbers on staff.

Since 1954, our team has been installing and servicing water heaters across Long Island. That history gives us working knowledge of the homes, the water chemistry, and the equipment that performs here.

When a water heater fails, the household feels it immediately. We offer same-day service and fast installation to get hot water restored without delay.

Know what you are paying upfront, with no surprises. We provide free installation quotes so you can make an informed decision without pressure.

A tankless installation is an investment. We offer manageable payment plans to suit your budget and make the upgrade more accessible.

Our Home Comfort Club includes annual service and priority scheduling. Tankless water heater maintenance fits naturally into the membership schedule.

We offer special pricing for military personnel, veterans, and seniors. That keeps quality service accessible across the customers we serve.

Universe is a BBB Accredited Business. Seven decades of plumbing work across Long Island stands behind every tankless water heater we install, repair, or maintain.


An Easy, Stress-Free Scheduling Process

Getting a tankless water heater installed or serviced should never feel complicated.

Universe Home Services makes the process easy from start to finish.

Call us or schedule service online at a time that works for you. Same-day availability and 24/7 emergency service are offered when you need it.

Your plumber evaluates your household’s hot water demand, the existing plumbing setup, and whether gas or electric is the right fit. You receive a clear recommendation before any work begins.

Every installation is tested and commissioned before the visit ends. Your tankless water heater is confirmed to be delivering hot water at the expected flow and temperature.

(516) 473-0202

What Our Customers Are Saying

100% Satisfaction Guarantee

4.8
Based on 7597 reviews
Excellent work by Patrick for a light fixture and hard wiring for a video doorbell with chime.
Michael Greer
7 days ago
Universe responded promptly to my service call and the technician was very friendly and knowledgeable. We had to wait a few days for the parts, but when it arrived (new sewage ejector pump) the repair was done quickly and everything worked perfectly.
howard valan
1 week ago
Tim the technician answered all my questions to my satisfaction and explained all my options thoroughly. His work solved my issue and he offered some insight into a replacement unit if I opted to do so.
Desiree Boucher
1 week ago
I had a great experience with Universe Home Services. I initially left a message on their call system and received a call back with 30 minutes from Laurie. I explained my concern and issue we were having with out Central AC and she was able to schedule service for that same day. I received text messages with arrival time, when the technician was on their way, and when they arrived at my home. Our service technician was Bob Grillo. He was super personable, kind and very thorough in his process. He answered all my questions and explained exactly what he was doing as he was troubleshooting. I had a great experience overall with the customer service as well as the job completion and would highly recommend Universe Home Services and Bob as the technician.
Danny Sutton from Sales was amazing.without him this was not possible.so kind and empathetic towards customer amazing service From the crew who was here to install the air condition Sean Dany Jared Brian Very professional polite and extremely knowledgeable They worked so efficiently and kept the area clean that you could not feel that a big job was completed after they left. I will recommend Universe home service to everyone out there who is looking for a reliable company.
shelly bansal
2 weeks ago
VERY. GOOD. SERVICES. THEY. COVER. GAURENTEE. FOR 5. YEARS. GOOD PRICE. TONY. ASHMAVI. THE. BEST. WHO. EXPLAINED. ALL DETAILS. AND. GIVE. GOOD PRICE. TOP. RATED. THANKS TO. UNIVERSAL. HOME. SERVICES
Scott Faucheux
2 weeks ago
We have used Universe now for a few installations, Anthony recently swapped out a toilet for us, cleared out a major blockage on a sewer line and Vidal just installed a whole house filtration system for us after our previous system failed on our 1929 house. They have been very polite, knowledgeable and efficient and have always given us fair and tiered options with pricing. We would highly recommend their services.
Justin Bridges
2 weeks ago
Micheal was a great technician, perfectly on time, fast detailed diagnosis, made quick work of the repair work, communicated everything. Universal did all my installations of all new HVAC and I always trust them with the maintenance.
Mario Sesso
3 weeks ago
Ac repair
Donna Cincotta
3 weeks ago
Kevin came to my home, evacuated the problem and detailed the situation to me. He ordered the new ductless equipment and installed it the next day. Kevin was professional, honest, neat and made sure the air conditioning was working properly. For my air conditioning units and repairs, I wouldnโ€™t go anyplace else.
The team was incredibly professional, friendly and worked efficiently to get the job done. I had a great experience
fran lucher
3 weeks ago
Came within reasonable time, fixed problem & checked for other possible issues.
William Funcheon
4 weeks ago
Dean, your technician is definitely an asset to your company. He was so thorough and kind. I canโ€™t say enough about him!
Laurence Andrews
4 weeks ago
I am pleased with the the service man that came out. He is very knowledgeable and professional
Donna Mckeon
4 weeks ago
Our service person Sean was great. Very knowledgeable and friendly. Answered all questions we had. Definitely will use Universe home services again
I canโ€™t say enough good things about Universe home services and repairs. We have been a customer of Universe for years. Recently we had a plumbing issue and they were wonderful. Jeff the plumber was very professional and a pleasure to work with. We have also worked with Marc on a gas conversion. He was very knowledgeable, professional, and helpful. Great company with quality people! Update June 2026 – another 5 stars for Universe Home Services and electrician Dawid Boroch. Dawid was very professional, knowledgeable, and his work is exceptional. He explained the scope of the job and answered our questions before beginning his work and walked us through the results afterwards. Dawid was an absolute pleasure to work with and we highly recommend him!
Marie kopczynski
4 weeks ago
Very professional Answer all my questions Did a great job
Ronald Goebel
4 weeks ago
Chester was the best service tech we ever had. A real credit to Universe-friendly, knowledgeable and thorough in his work
Elise Puig
4 weeks ago
From sales to installation I was confident that this was the company that would deliver!
Wendy Fiedler
4 weeks ago
Very informative introduction, stated work was performed very efficiently and timely, cleaned up after work was completed, workmen were all very polite and respectful. Great job!
Brenda Cohen
4 weeks ago
Ac repair
Quick response time, fixed issues within an hour and good communication from beginning to end. Will use Universe again and would recommend
Stephen Sacco
4 weeks ago
Very good. JP is terrific – an asset to Universe Bob also did a great djob with Sean was excellent at problem solving But why did he put this over surge ?
Patrick Hoey
4 weeks ago
Professional advice and good information provided. Peter was on time, called a few minutes in advance and is a very nice guy!
Helene Sherman
4 weeks ago
Chris was very nice took his time going through a very large house, explained a lot of things, and was very honest. He did not try to โ€˜sell usโ€™ on anything we didnโ€™t need.

Universe Home Services truck stocked for HVAC, plumbing, and electrical repairs

(609) 799-3434

Tankless Water Heater Installation

Installing a tankless water heater is a meaningful upgrade for Long Island homes looking to save space and reduce energy usage.

Universe installs tankless water heaters across Nassau and Suffolk County, including gas and electric models.

Tankless units are significantly more compact than traditional tank water heaters. That compact size frees up valuable space in your utility room, basement, or closet.

Tankless water heaters only heat water when it is needed, which eliminates the standby losses of a traditional tank. That efficiency shows up as lower utility bills month after month.

A correctly sized tankless system delivers hot water on demand, without the wait for a tank to reheat. That makes simultaneous fixture use possible in homes where the tank used to be the bottleneck.

Reduced energy usage makes tankless a meaningfully greener choice than a traditional tank. Homeowners focused on long-term environmental impact appreciate the efficiency.

Tankless Water Heater Replacement

Tankless water heaters are known for their durability, and they often last more than 20 years. When a unit does reach the end of its service life, replacement is the right call.

Universe handles tankless water heater replacement across Nassau and Suffolk County.

Tankless systems typically last 20 years or more. A unit past that window is a candidate for replacement, particularly if performance has declined or repair costs are mounting.

When the cost of a significant repair approaches what a new unit costs installed, replacement is the better investment. A new unit comes with manufacturer warranty and updated efficiency.

A tankless water heater sized for a smaller household or different fixture count may struggle to keep up as usage changes. Replacement with a correctly sized unit restores reliable flow.

Major plumbing work or a kitchen or bathroom renovation is a natural time to replace and reintegrate the tankless water heater. We coordinate the work as part of the larger project.

Tankless Water Heater Repair

Tankless water heaters can develop common issues including mineral buildup and ignition problems, which may require professional attention.

Universe diagnoses and repairs tankless water heaters across Nassau and Suffolk County. We can help with:

Nassau County’s hard water deposits mineral scale on tankless heat exchangers, which reduces efficiency and eventually affects flow. We descale the unit and restore performance.

A tankless unit that will not fire or cuts out mid-use has an ignition system, gas supply, or flame sensor issue. We diagnose the cause and complete the repair.

Temperature swings or a unit that delivers only lukewarm water has a flow sensor issue, a gas supply problem, or a component that needs attention. We identify the cause and correct it.

Modern tankless units display error codes when they shut down. We interpret the codes and resolve the underlying issue before the unit cycles through the same failure again.

Family dancing together in living room


Green Universe Van parked on the side of residential street

(516) 473-0202

Tankless Water Heater Maintenance

Tankless water heaters require routine maintenance to continue performing at the efficiency and flow they were installed to deliver.

Universe provides tankless water heater maintenance across Nassau and Suffolk County.

Flushing a tankless water heater prevents mineral buildup and keeps the system running efficiently. On Long Island, where water is hard, annual flushing is the standard recommendation.

Inlet filters, sensors, and valves need periodic inspection to keep the system performing. Maintenance catches early wear before it becomes a no-hot-water event.

Gas tankless units require proper combustion and venting for safe, efficient operation. We verify both as part of the annual maintenance visit.

Scheduling maintenance before peak heating season or heavy-use periods confirms the unit is ready for the demand. That proactive service reduces the chance of a failure when hot water is needed most.

Other Solutions for Your Home from Universe Home Services


Choose Universe Home Services for Tankless Water Heater Services

When it comes to tankless water heater services on Long Island, Universe Home Services brings over 70 years of experience to every visit.

As your trusted partner, we combine rapid response with quality service. Contact us online or call to get on the schedule.

Universe Home Services Technician near open van doors

Tankless Water Heater FAQs

How long does a tankless water heater last?

Most tankless water heaters last more than 20 years with proper maintenance. That is significantly longer than a traditional tank, which typically lasts 10 to 12 years.

Will a tankless water heater supply enough hot water for my home?

A correctly sized tankless unit supplies plenty of hot water for the household. Sizing depends on flow rate demand and simultaneous fixture use, which we evaluate during the consultation.

Is it expensive to switch from a tank to a tankless water heater?

Switching to tankless involves equipment and installation costs that are typically higher than a straight tank replacement, but the efficiency gains and longer service life often offset the difference over time. Financing options are available.

How often does a tankless water heater need maintenance?

Annual maintenance is the standard recommendation, especially on Long Island where hard water accelerates scale buildup. Flushing and inspection keep the unit performing at the level it was installed to deliver.

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