For the installation, connection, maintenance, or repair of sewer, drain, and gas lines, MASI Plumbing, Heating & A/C provides expert residential services in Southern New Hampshire.

Our technicians maintain gas and plumbing licenses and are equipped with state-of-the-art location technology. We always dig in the right place, prioritize safety, and ensure your new system is up to code.

Don’t hesitate to call our team for sewer, drain, and gas line services!

A decrease in water pressure, discoloration of water, or a soggy area in your yard are signs of a damaged water line. Years of freezing and thawing, intrusion of tree roots, ground movement, mineral buildup, and water pressure take their toll over the years. If you have any concerns, don’t hesitate to give MASI Plumbing, Heating & A/C a call at (603) 889-2331. We have the experience and effective tools to pinpoint the problem and offer free estimates and flat-rate pricing. MASI Plumbing, Heating & A/C highly recommends proactive maintenance to combat issues before they graduate into more costly consequences.

Family owned and operated, MASI Plumbing, Heating & A/C is a proven and local source for installation, repair, and upkeep of sewer, drain, and gas lines. Whether you suspect an unhealthy sewage leak, are thinking of converting to natural gas, or are interested in preventative measures, we look forward to delivering complete satisfaction. For emergency situations, MASI Plumbing, Heating & A/C is always available, day or night, 365 days a year, providing service across Nashua, Milford, Amherst, Hudson, & Merrimack, NH.

Serving Southern New Hampshire

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

Gas PipingAppliance InstallationGas Line Services ∴ Hudson, NH ∴ Merrimack, NH ∴ Amherst, NH

Gas Line Services, Gas Piping & Appliance Installation Milford, NH, Hudson, NH, Nashua, NH, Merrimack, NH & Amherst, 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!