As a homeowner, you already know it costs more to heat your home with heating oil than natural gas.

At MASI Plumbing, Heating & A/C, we complete cost-effective conversion from oil to natural gas. Let’s make your home as comfortable and energy efficient as possible. Over our 55 years of service in Southern New Hampshire, we’ve handled thousands of gas conversions, providing rewards above and beyond lower heating bills. Our technicians are fully licensed and ensure swift, safe, and skilled services.

Enjoy the Benefits of Oil to Gas Conversion Service

We take great pride in reducing environmental impact and increasing the value and enjoyment of homes throughout Southern New Hampshire. Let’s make your home as comfortable and energy efficient as possible. Make your appointment today and start taking advantage of the many benefits of natural gas.


Here are just a few of the rewards of converting to natural gas:

  • Add value to your home
  • Cleaner
  • Convenience of gas appliances such as ovens, dryers, and water heaters
  • Forty percent less greenhouse gases
  • Higher efficiency heating systems
  • Less maintenance
  • Lower energy bills
  • 100% less sulfur dioxide
  • Never run out
  • No advance payments
  • No need for delivery
  • No odors of heating oil

Serving Southern New Hampshire

  • Wilton
  • Milford
  • Amherst
  • Mont Vernon
  • Brookline
  • Hollis
  • Nashua
  • Hudson
  • Litchfield
  • Bedford
  • Manchester
  • Derry
  • Londonderry
  • Windham
  • Pelham
  • Salem
  • Merrimack

Furnace ReplacementHeating System ConversionsOil to Gas Conversions

Heating Service & Furnace Service Nashua, NH, Milford, NH, Amherst, NH, Hudson, NH & Merrimack, NH

Paula L.

Came home to my central a/c not working. After checking a few things, I called Masi Plumbing, based off of consumer reviews here. The person who answered the phone was accommodating to my needs and had a service person here super promptly! The service person was very friendly, highly informative and fixed the issue promptly- and not at a high cost either! Will def be calling them for our needs again, and referring them as well. Thanks a million Masi Plumbing!

Susan C.

My pipes froze and burst on a Sunday evening. I called several plumbers who would not give me the time of day. MASI Plumbing to the rescue! They sent a plumber (Nick) out immediately who was able to repair the broken pipes that evening, even though though he had already worked all day! A huge thank you! I highly recommend MASI Plumbing and will be using them exclusively in the future.

Christine C.

Bought a new boiler system from them this year and they gave us the most comprehensive quote for the right work (pointed out the need for fresh air and a new oil line which we knew were needed) at a good price. Unfortunately one of our parts in the system failed, but they had it replaced and our system up and running within 2 hours, and covered under warranty, so no cost to us. They have always been very friendly, down to earth, but professional. Great to work with!