You depend on a reliable source of sufficient, clean, hot water.

Any concerns with your water heater are a major disruption. Whether you’re looking for repairs, replacement, preventative maintenance, new installation, or conversion to tankless water heating, MASI Plumbing, Heating & A/C targets our services to optimize value. Our team of fully licensed plumbers have the experience, expertise, and resources to resolve any residential heating challenge. Outfitted with state-of-the-art technology and drawing from a broad spectrum of proven products, MASI Plumbing, Heating & A/C delivers unequaled results in Southern New Hampshire. We provide systems from top quality brands such as Bradford White, Rinnai Tankless, Navien, and State.

Efficient Hot Water Heater & Tankless Water Heater Installations & Services

Get in touch with MASI Plumbing, Heating & A/C at (603) 889-2331 for timely response, free estimates, and flat rate pricing. Family owned and operated, with strong ties in our local community, we’re the company you can trust. Over our 55 years of dedication, we tackled every make, model, and style of water heater and are proficient in tankless options. With accurate and honest evaluation, we provide the most cost-effective strategies and focus on sustainable performance. Our goal is not to simply sell you something but to optimize convenience, cost-savings, and satisfaction. MASI Plumbing, Heating & A/C is always here to help in the event of an emergency, 24 hours a day, 365 days a year, with prompt response 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
  • Merrimack

Plumbing ServiceHot Water HeatersPlumbing Repair

Hot Water Heater Installation & Water Heater Repair 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!