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Heating

Heating Project Gallery

Real heating work completed by NJM across Nassau and Suffolk County — boiler installations, furnace replacements and radiant floor systems.

BOILERSFURNACESRADIANT FLOORGEOTHERMAL
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TASK 86/87 Certified
Navien NSS Certified
22+ YEARS ON LONG ISLAND

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Heating

Boiler, Furnace & Radiant Installations On Long Island

Heating installations photographed during the work, which is the only point at which the parts that matter are visible. Boiler and furnace replacements, near-boiler piping, radiant floor systems and the gas connections that feed them.

The piping around a boiler is where a heating installation is won or lost, and it is the first thing covered up and forgotten. These photographs show it done deliberately — properly supported, correctly configured, and laid out so the system runs at the temperatures the equipment was designed for.

24/7 Emergency ServiceLicensed & Insured
  • Master PlumberLicensed to pull permits
  • TASK 86/87Certified for gas work
  • Navien NSSFactory-trained on tankless

22+ years on Long Island · Plumbing, heating, cooling, gas and contracting under one roof

Heating — before you call

Two kinds of visit. You’ll know which before we come.

We don’t charge to quote a job. We do charge to find a problem nobody has identified yet. Which one you need — and what it costs — gets agreed on the phone, so nothing about the cost is a surprise on the doorstep.

Estimate visitNo charge

You already know what you want done

A boiler replaced, a bathroom rebuilt, a gas line run. We come out, look at the job and give you a number.

No obligation
Diagnostic visitQuoted on the call

Something has failed and nobody knows why

A licensed technician and the time to find what has actually gone wrong. One rate across plumbing, heating, cooling and gas, and one number to reach us on — there is no separate line to find at midnight. You get the figure before anyone is dispatched, and after-hours, weekend and holiday work is quoted the same way.

The rate you are told is the rate

You get the number on the phone, before anyone is dispatched, and it is what you are charged when the technician arrives. One rate across all four trades — plumbing, heating, cooling and gas.

What it pays for

A licensed, insured technician carrying the certifications the work needs, and the time to find what has actually failed — not a quick look and a guess.

Watch for the bait and switch

A call-out advertised at almost nothing gets recovered once someone is standing in your basement. Get the number before anyone travels — from us, or from anyone else you call — and hold them to it when they arrive.

Financing on larger jobs

A boiler that fails in January is not a purchase anyone planned. Financing is available on the big-ticket work, so a system replacement does not have to come out of savings in one go.

What it is normally used for

Boiler, furnace and water heater replacement, a full air conditioning system, a whole-house repipe, sewer and water main work, and larger contracting jobs — kitchens, bathrooms, dormers and extensions.

When to bring it up

At the estimate, before anything is scheduled. It is worth asking even if you think you will not need it, because knowing it is there changes what you are willing to consider fixing properly.

What it does not change

The price of the job. The quote is the quote whether you finance it or not — and on a straightforward repair it is usually not worth the paperwork. We will tell you which one you are looking at.

Financing provided throughSynchronyCredit is extended by Synchrony. Subject to credit approval.
Call 631-587-0085Not sure which one you need? Call and describe it — we will tell you before we book anything.
How To Look At These

What A Good Heating Installation Looks Like In A Photograph

Most people cannot tell a careful boiler installation from a rushed one, which is exactly why it is worth showing you. Here is what we would look at — in these pictures and in anybody else's.

Start with the piping, not the boiler. Any two installers can hang the same appliance on the same wall. What separates them is the copper around it: whether the runs are properly supported rather than sagging between fittings, whether the pipework is laid out in a deliberate order or threaded wherever it would fit, and whether somebody thought about how it would be serviced in ten years.

Then the components nobody photographs. The expansion tank and the air separator have correct positions relative to the circulator, and a system where they are simply wherever there was room will trap air and short-cycle no matter how good the boiler is. Circulators should sit with isolation valves either side so a pump can be changed without draining the system — a small thing that costs almost nothing at installation and a great deal the first time it is needed.

On the radiant photographs, look at the tubing before the manifold. Even spacing across the panels, properly fastened so it cannot float when the pour goes down, and a manifold with the zones actually labelled. An unlabelled manifold works fine on day one and becomes a guessing game for whoever services it next.

None of this shows once the job is finished, which is why we photograph it while it is open. If you are comparing quotes, ask the other company for pictures of their pipework rather than their finished boilers. The answer you get is informative either way.

Quick Rules Of Thumb

  • Copper supported along its length, not sagging between fittings
  • Expansion tank and air separator positioned relative to the circulator
  • Isolation valves either side of a pump, so it can be changed without draining
  • Radiant tubing evenly spaced and fastened down before the pour
  • Zones and manifolds actually labelled for whoever comes next
  • Ask a competing quote for pipework photos, not finished-boiler photos
Talk It Through — 631-587-0085
Recent Work

Projects Across Long Island

Boiler installations, furnace replacements and radiant systems fitted across Long Island.

Showing 24 of 58 photos

More Heating Services

Everything We Handle In Heating

One licensed team, one number to call, across Nassau and Suffolk County.

Boiler Installation by NJM Mechanical & Contracting on Long IslandHEATING

Boiler Installation

Licensed boiler installation for Long Island homes & businesses. Gas, oil & high-efficiency systems. Navien NSS certified across Nassau & Suffolk County.

  • GAS & OIL
  • HIGH-EFFICIENCY
  • NAVIEN NSS CERTIFIED
  • PERMITS HANDLED
Boiler Installation
Boiler Repair & Maintenance by NJM Mechanical & Contracting on Long IslandHEATING

Boiler Repair & Maintenance

Boiler repair, maintenance & tune-ups across Nassau & Suffolk County. Licensed Long Island heating techs, 24/7 emergency service, all major brands.

  • REPAIRS
  • TUNE-UPS
  • ALL MAJOR BRANDS
  • 24/7 EMERGENCY
Boiler Services
Comprehensive Furnace Services by NJM Mechanical & Contracting on Long IslandHEATING

Comprehensive Furnace Services

Furnace installation, repair & maintenance for Long Island homes & businesses. Gas & high-efficiency systems serviced across Nassau & Suffolk County.

  • INSTALLATION
  • REPAIR
  • HIGH-EFFICIENCY
  • MAINTENANCE
Comprehensive Furnace Services
Geothermal Heating Systems by NJM Mechanical & Contracting on Long IslandHEATING

Geothermal Heating Systems

Energy-efficient geothermal heating installation & service for Long Island homes. Lower energy bills, cleaner heat across Nassau & Suffolk County.

  • ENERGY EFFICIENT
  • GROUND SOURCE
  • INSTALLATION
  • SERVICE
Geothermal Heating Systems
Radiant Floor Heating by NJM Mechanical & Contracting on Long IslandHEATING

Radiant Floor Heating

Radiant floor heating installation for Long Island homes — even, efficient warmth from the ground up. Licensed HVAC across Nassau & Suffolk County.

  • EVEN WARMTH
  • QUIET OPERATION
  • NEW BUILDS
  • RENOVATIONS
Radiant Floor Heating
Common Questions

Frequently Asked Questions

What should I actually be looking for in these pictures?

The piping rather than the appliance. Whether the copper is supported along its length instead of sagging between fittings, whether the expansion tank and air separator are positioned properly relative to the circulator, whether there are isolation valves either side of the pump so it can be replaced without draining the system, and whether the zones are labelled. Those are the things that decide how a system behaves for the next twenty years, and they are all invisible the moment the job is signed off.

Why does near-boiler piping matter so much?

Because it determines flow rates and return temperatures, and those determine whether the boiler ever performs the way it was sold to you. A high-efficiency condensing unit plumbed into an old layout that returns water too hot will not condense, which is the entire mechanism it was bought for. The appliance is the easy part of the purchase. The piping around it is the part that decides what you actually got.

Can I use this to judge a quote from someone else?

That is partly why it is here. Ask any company you are considering for photographs of their own pipework mid-installation, not finished boilers or manufacturer images. Contractors who take that kind of picture generally do so because they are happy for it to be looked at closely. It is a fair question and the answer tells you something either way.

Are these your own installations?

Yes, all of them, completed by our own licensed crew across Nassau and Suffolk County. Nothing here is manufacturer or stock photography.

Why do so many photographs show the pipework rather than the boiler?

Because that is where the quality is. Near-boiler piping determines flow rates, return temperatures and how the system behaves — a high-efficiency boiler plumbed into an old layout unchanged will never reach the efficiency it was sold on.

Do you install oil as well as gas?

Both, plus high-efficiency condensing, geothermal and radiant. Plenty of Long Island homes still run on oil and we install and service those alongside gas.

Service Area

Proudly Serving Long Island and Surrounding Areas.

Based in North Babylon, working across both counties — close enough to get there fast, local enough to know the housing stock and the permit offices.

Find Heating Services Near You!

  • Long Island
  • Nassau County
  • Suffolk County

Towns We Serve

Proudly serving all of Nassau and Suffolk County, with deep local roots near our North Babylon home base.

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What Long Island Says

Reviews From Homes & Businesses We've Served

5 out of 5 stars

NJM Mechanical Inc are awesome!!!!! Just Had a maintenance call / yearly service. Always professional prompt service. I had Neil as my service tech - great job.

Dan O.July 2026
Reviewed on Housecall Pro

5 out of 5 stars

Couldn't be happier with NJM Mechanical and Neil. I needed a new Navien wall mounted gas combination boiler. He showed up on Friday afternoon to diagnose and was at my house at 7am the very next morning on a Saturday throwing in my new Boiler. They didn't charge Emergency Service rates and they beat their competitors price by over $500!

Eric LinnemanApril 2026
Reviewed on Google

5 out of 5 stars

Neil and his team showed up in an emergency situation where I had no heat because my furnace died. His professionalism and ability to diagnose the problem was incredible. My mom is 87 years old and he made her comfortable with his kindness. Thanks for warming our home, and our lives Neil. God bless you and your team!!

Pete RadoJanuary 2026
Reviewed on Google

Read all 87 reviews from Google and Housecall Pro →

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