Brands · Navien Certified Contractor · South Shore MA
Navien Tankless, Combi & Boilers
3R is a Navien Certified contractor. Tankless water heaters, combi boilers, and high-efficiency condensing boilers — sized, installed, and maintained by a team that’s been through Navien’s own training, which is what protects your warranty and keeps endless hot water actually endless.
NAVIEN
3R is a Navien Certified contractor. Explore the full product lineup at navieninc.com → then call 3R for installed pricing.
Upgrading to high-efficiency? We handle the incentive paperwork. Qualifying Navien tankless and condensing boiler installs may be eligible for Mass Save rebates and 0% HEAT Loan financing — see current rebates for what applies in 2026.
Endless Hot Water, Done Right
Navien’s condensing tankless units heat water on demand at efficiency conventional tanks can’t touch, and the combi line does space heating and domestic hot water from one wall-hung box. But tankless is unforgiving of shortcuts: gas line sizing, venting, condensate handling, and water quality decide whether you get fifteen quiet years or a callback in eighteen months. As a Navien Certified shop we size the unit to your actual fixture demand and gas supply, install isolation valves for the annual descaling every tankless needs, and register the equipment so the full warranty is on record from day one.
Recent Navien Installs by 3R
Tankless water heaters
Condensing NPE-series units sized to your real fixture demand — endless hot water, a fraction of the footprint, and serious efficiency gains over a tank.
Combi boilers
Space heating and domestic hot water from one wall-hung unit — the space-saving answer for condos, capes, and homes replacing an aging boiler plus tank.
Warranty protected
Certified installation, equipment registration, and annual descaling/maintenance keep Navien’s strong warranty fully intact — we set all three up for you.
What We Install
Navien NPE-series condensing tankless water heaters, NCB combi boilers, and high-efficiency condensing boilers — plus annual maintenance plans that keep the warranty valid and the heat exchanger clean. Browse the lineup at navieninc.com, and if you’re weighing a boiler-only route, compare with Laars, Lochinvar, and Viessmann — we install all four and will tell you which fits your system.
Tired of running out of hot water?
Certified Navien install, honest sizing, and incentives applied up front.