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MASI Plumbing, Heating & Air Conditioning

Welcome to MASI, Your BEST™Residential Plumbing, Heating and Air Conditioning Experts!
What does BEST™ mean? It means that, for more than 40 years, the professionals here at MASI have made sure you get the right solution – the BEST™ solution – when it comes to staying comfortable in your home, year-round.

We offer Brands, Expertise, and Service you can Trust. We’re your source for hard-to-find and specialty items you’ll never see at big box stores – old or discontinued faucet parts, unusual connectors, or just the things they won’t stock because there isn’t enough demand.

You can also count on us for professional help and advice. If you need us to show you how, we will. If you’d rather let us handle the job, we’re happy to oblige. masi quote.jpg

We Are Licensed to Install and Repair Everything We Sell. (Everything the other guys sell, too!)


Bath & Kitchen Fixtures • Disposers • Tank, Indirect & Tankless Water Heaters • Copper, Iron & PVC Pipe • Hard-to-Find Fittings • Faucet Washers & Toilet Parts • Pumps • Bladder Storage Tanks • Water Treatment • Sewage Ejectors


High-Efficiency Furnaces & Boilers • Heat Exchangers • Radiant Heat • Zone Systems • Thermostats • Ducting

Air Conditioning

High-Velocity Specialists • Standard & Ductless Split Systems • Condenser Replacement

Gas Piping

Natural & LP Gas Piping • Gas Fittings • Stove Hook-Ups

Indoor Air Quality

Testing & Analysis • Carbon Monoxide Detectors • Air Purifiers • Bio-Filters

Preventive Maintenance

Furnace, Boiler & Air Conditioning Tune-Ups Filters & Sealants

Emergency Services

One-Day Furnace & Boiler Replacement One-Day Water Heater Replacement


Please take a look at the products and services we offer, browse through the rest of this site, and then call or come visit any time you feel we can help See you soon! (C)

  • Air Conditioning,HVAC
  • Heating Companies|Contractors
  • Plumbers-NH Plumbing Contractors
36 Otterson Street
Nahsua, NH   03060
Phone: (603) 889-2331