Oil-to-Gas Heating Conversion on Long Island

Converting an oil furnace or boiler to natural gas: the steps, the timeline and what drives the cost.

Plenty of Long Island homes still heat with oil on streets where natural gas is now available. Converting means no more deliveries or tank to look after, and usually a cleaner, quieter system. K2 converts oil furnaces and boilers to gas for homes within about 15 miles of Deer Park. This page explains what the job involves before you commit.

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Common Problems We Fix

Homeowners usually call about a conversion for one of these reasons:

The oil furnace or boiler is old or failing. When equipment needs replacing anyway, switching fuel at the same time avoids buying a new oil burner.
The oil tank is aging. Older tanks, especially buried ones, are a leak risk and a concern for home sales and insurance.
Soot, smell and burner service. Oil burners need a nozzle, filter and combustion tune every year, and a poorly adjusted burner soots up the chimney and the house.
Selling the house. Buyers and lenders often ask about the oil tank, and some prefer gas heat.

Not every house is a good candidate. If gas is not on your street, or the cost to bring it in is high, a cold-climate heat pump may be the better route; see do heat pumps work through a Long Island winter.

What Happens on the Visit

A conversion has more steps than a straight replacement, and some of them are outside our control:

Gas availability. First, confirm with the gas utility (National Grid on Long Island) that gas is on your street and what it takes to bring a service line and meter to the house.
Assessment. We look at the existing furnace or boiler, the chimney or venting, the gas load the house needs and the location of the new piping, then quote either converting the burner where that is sound or replacing the equipment.
Permits and the utility. Gas work and equipment changes can need town approval, and the utility schedules its own service line work. K2 does not file town permits, so confirm the requirements with your building department; we will tell you what the work involves so you can.
Installation. We install the gas piping from the meter to the appliance, the new or converted equipment and the venting. A chimney liner is often required, because gas exhaust is cooler and wetter than oil exhaust.
Start-up. We test the gas piping for leaks, commission the equipment and walk you through it.
The oil tank. The tank must be properly removed or abandoned by a licensed tank company, following town and fire marshal rules.

Once gas service is in, the equipment work itself typically takes one to three days. The utility's timeline for the new service line is usually the longest wait, and it is not something any contractor controls, which is why we never promise an install date.

What Affects the Price

We quote conversions after an in-home assessment. What drives the price:

Convert or replace. Fitting a gas burner to a sound boiler costs far less than a new furnace or boiler, but only some equipment is a good candidate.
Equipment type and efficiency. A standard or high-efficiency condensing furnace or boiler, or a combi boiler that also makes hot water.
Venting. Whether the chimney needs a liner, or a high-efficiency unit can vent through the wall with PVC.
Gas piping. The distance from the meter and any other gas appliances, such as a range, dryer or water heater, that you want connected.
The oil tank. Removal or abandonment is a separate cost from a tank company, and buried tanks cost more.
The utility. Any charges the gas company sets for the service line and meter.

Repair or Replace?

If your oil equipment is relatively new and in good shape, converting the burner to gas can be the economical choice. If it is near the end of its life, replacing it with new gas equipment at the same time is usually the better investment, because you only pay for the venting and piping work once.

It is also worth comparing a conversion with a cold-climate heat pump, which adds central air and avoids a gas line altogether. PSEG Long Island offers rebates on qualifying heat pumps; rebates are applied for through PSEG Long Island, and terms change, so confirm current details at psegliny.com. K2 is not a PSEG Long Island participating contractor and does not file rebate applications. Our guide on PSEG Long Island heat pump rebates covers the basics. Financing is available through Rheem KwikComfort, with credit provided by Synchrony Bank, subject to credit approval. See financing for how it works.

Brands We Service

Our technicians work on all major brands, including:

Carrier
Mitsubishi Electric
Daikin
Bosch
Trane
Rheem

Where We Provide Oil-to-Gas Conversion

We serve homes within about 15 miles of our shop at 60 S 2nd St V in Deer Park, across western Suffolk and eastern Nassau County. Local pages for the towns we cover:

Popular Areas for Oil-to-Gas Conversion

What Our Customers Say

"This is my second (distinct) job with K2 HVAC and I could not be more appreciative of their prompt and quality services. The first job (a replacement of my heating unit) was handled excellently by Shelby and the second (a replacement of my hot water unit) was amazingly handled by Waseem. The backend customer support is fantastic too, as Sadia is ever responsive by text and phone call. All said, I recommend their services wholeheartedly!"

tobi bell Google review

"Waseem is excellent. He checked my heating system, diagnosed the problem and fixed the whole system. Now the heat is working excellently. I am highly recommending this company to any person house. He is very thorough and spent as much as was needed to repair the heat. We are very thankful. He is excellent. Thank you so much to your company."

Tamara Shashiashvili Google review

"This was my first time using K2 Cooling & Heating, and I could not be happier with the experience. Waseem arrived on the scheduled day right on time and took the time to listen carefully to the issues I was having with my HVAC unit before beginning any work. He quickly diagnosed the problem and explained everything clearly in a way that was easy to understand. His professionalism, knowledge, and attention to detail were outstanding."

Shahid Ali Google review

Oil-to-Gas Conversion: Frequently Asked Questions

How long does an oil-to-gas conversion take?

Once gas service is at the house, the equipment work typically takes one to three days, depending on whether the burner is converted or the furnace or boiler is replaced and whether a chimney liner is needed. The longest wait is usually the gas utility installing the service line and meter, which no contractor controls.

Can my existing oil boiler be converted to gas?

Sometimes. A sound cast iron boiler can often take a gas conversion burner, which costs much less than a new boiler. Older or inefficient boilers, and most oil furnaces, are better replaced with new gas equipment. An in-home assessment tells you which applies.

What happens to my oil tank after converting to gas?

It has to be properly removed or abandoned in place by a licensed tank company, following your town and fire marshal requirements. Basement tanks are usually removed; buried tanks may be removed or abandoned. Keep the paperwork, because buyers and insurers often ask for it.

Do I need a chimney liner when switching to gas?

Often, yes. Gas exhaust is cooler and wetter than oil exhaust, and in an unlined masonry chimney it can condense and damage the flue. A liner sized for the new equipment solves that. High-efficiency condensing furnaces and boilers avoid the chimney entirely by venting through the wall with PVC pipe.

Does K2 handle the permits for a gas conversion?

No. K2 does not file town permits. Gas work and equipment changes can require approval from your town building department, so confirm the requirements with them before the work is scheduled. We will explain exactly what the installation involves so you have what you need.

Is a heat pump a better option than converting to gas?

It can be, especially if gas is not on your street or you also want central air. A cold-climate heat pump heats and cools from one system, and PSEG Long Island offers rebates on qualifying models, applied for through PSEG Long Island. Running costs depend on your current fuel, so compare both before deciding.

Book Oil-to-Gas Conversion With K2

Call or text (631) 414-7141 any time, or send the form and we will call you back to schedule. You get the cause and the price before any work starts. Financing is available through Rheem KwikComfort, with credit provided by Synchrony Bank, subject to credit approval.

Call (631) 414-7141 Text us Request service