Factory-Trained & Certified · South Shore MA
Brands We Install & Service
We are picky about the equipment we put our name on. These are the lines we install because they hold up in New England, backed by real factory certifications rather than a dealer sticker — and we service virtually every major brand, no matter who installed it.
Jump to: Heat Pumps & Cooling · Boilers, Combis & Hot Water · Thermostats & Controls · Equipment Types Explained
Earned, Not Purchased
Our Two Factory Certifications
Mitsubishi Diamond Contractor
Diamond Contractor status comes from multi-stage, hands-on factory training — not from buying equipment. The practical benefit to you is warranty length: a Mitsubishi system installed by a Diamond Contractor in a single-family home and registered within 90 days carries 12 years on parts and 12 years on the compressor. Installed by a non-certified contractor, the same equipment carries 5 years on parts and 7 on the compressor.
We handle the registration for you. You should never have to chase your own warranty paperwork.
Navien Certified
Navien Certified Contractor
Navien backs its condensing equipment with 10 years on the heat exchanger and 5 years on parts — but condensing appliances only deliver that life if they are vented, gas-sized, and commissioned correctly. Every Navien unit we install is set up with a combustion analyzer, not by ear.
Annual service is a warranty requirement, not a suggestion. Our Total Care Club keeps that on schedule automatically.
Heat Pumps, Ductless & Cooling
These are the lines that qualify for Mass Save heat pump rebates. Which one fits depends on whether your home has usable ductwork, how many zones you need, and how cold you need it to keep working.
Ductless · Ducted · Cold-Climate
Mitsubishi Electric
Our flagship line, and what we put in most whole-home electrification projects. Hyper-Heating (H2i) outdoor units hold rated heating capacity down into single-digit outdoor temperatures, which is the whole ballgame in a Massachusetts January. Indoor options run from wall cassettes to ceiling cassettes to fully ducted air handlers, so one outdoor unit can serve very different rooms.
Equipment we install: M-Series single and multi-zone ductless · P-Series · Hyper-Heating H2i cold-climate outdoor units · ducted air handlers · ceiling and floor cassettes
Ductless · Cold-Climate
Fujitsu
Fujitsu’s Airstage line delivers proven inverter performance at a friendlier cost per zone, which often makes it the right call when the project is three or four zones and the budget is real. The XLTH (Extra Low Temperature Heating) outdoor units are the ones to look at here — rated to operate down to −15°F, with a heated base pan so melting frost does not refreeze and chew up the fan.
Equipment we install: Airstage single-room and multi-room ductless · XLTH cold-climate outdoor units · wall, floor, compact cassette and slim-duct indoor units
Ducted Heat Pumps · Ductless
Bosch
If your home already has ductwork and a furnace or central AC, Bosch IDS is usually the cleanest and least invasive path to a heat pump — the inverter outdoor unit and air handler drop into the existing duct system, so you are not cutting up ceilings for line sets. The IDS Ultra is the cold-climate model, and it runs on R-454B, the low-GWP refrigerant the industry is moving to under the AIM Act.
Equipment we install: IDS Plus · IDS Premium & Premium Connected · IDS Ultra cold-climate (R-454B) · BMS500 Climate 5000 ductless
Furnaces · Central AC · Ducted Heat Pumps
Trane
Trane has earned its durability reputation, and it is still the right answer for a lot of ducted South Shore homes — particularly gas-heated houses replacing a furnace and AC together, or homeowners who want a conventional system rather than a full electrification project. We install Trane as properly matched systems sized by load calculation, because a mismatched coil and condenser will underperform no matter whose badge is on it.
Equipment we install: gas furnaces · central air conditioners · ducted heat pumps · matched coils and air handlers
Boilers, Combis & Hot Water
Every one of these is a modulating-condensing appliance with a stainless heat exchanger. All four are excellent; the differences that actually matter are hot-water output, how tight the space is, and where the nearest parts counter is.
Tankless · Combi · Condensing Boilers
Navien
The line we reach for most on gas and propane hot-water and combi work, and the one we are certified on. Navien is the largest combi-boiler manufacturer in North America, and the DHW numbers are the reason: up to 5.4 GPM at a 70°F rise, which is enough for two showers running at once in a New England winter. A combi replaces a boiler and a water heater with one wall-hung unit, which matters a lot in a tight basement.
Equipment we install: NPE-2 condensing tankless (NPE-A2 / NPE-S2) · NPN non-condensing tankless · NCB-H condensing combi · NFC-H fire-tube combi · NFB-H fire-tube boiler · NaviLink remote monitoring
Condensing Boilers · Hydronics
Viessmann
German-engineered hydronics, and the boiler we recommend when a homeowner wants the quietest, longest-lived option and is willing to pay for it. The stainless Inox-Radial heat exchanger and MatriX-Plus burner are genuinely a step up in build quality, and Lambda Pro combustion management self-adjusts to changing gas quality. Zero clearance to combustibles makes it a real option in cramped mechanical closets.
Equipment we install: Vitodens 100-W (B1HE / B1KE) · Vitodens 200-W (B2HE / B2HA) · ViCare app and Vitoconnect · indirect DHW tanks
Condensing Boilers · Combi
Lochinvar
The stainless fire-tube boilers heating pros tend to specify for their own houses. KNIGHT and NOBLE are known for serviceability — sensible internal layout, good controls, parts that are easy to source — which is exactly what you want on a piece of equipment you plan to keep for twenty years. Strong fit for multi-zone hydronic homes with baseboard or radiant.
Equipment we install: KNIGHT fire-tube condensing boilers · NOBLE condensing combi and heat-only boilers · indirect water heaters
Condensing Boilers · Combi
Laars
A New England boiler, built in Rochester, New Hampshire by a Bradford White company. The FT Series fire-tube heat exchanger uses a finned aluminum core inside a stainless sleeve, hits 95% AFUE, and vents up to 100 feet, which solves a lot of awkward retrofit problems. The real argument for Laars on the South Shore is regional: parts and factory support are close by, so a failed component is a same-week fix rather than a two-week wait.
Equipment we install: FT Series wall-hung combi (formerly Mascot FT) · FT Series floor-standing combi · FT Series heat-only · NeoTherm
Thermostats & Controls
Smart Thermostats · Zoning · Indoor Air Quality Control
Honeywell Home
The thermostat is where you actually touch your heating system, and it is also where a lot of comfort complaints get solved without touching the equipment at all. The ElitePRO S1200 is the current flagship — a 5-inch touchscreen, ENERGY STAR certified, with wireless room sensors over Redlink 3.0 so the thermostat can prioritize the room you are actually in instead of the hallway it happens to be mounted in. It monitors humidity, tracks VOCs, and estimates CO₂ levels, and it can control IAQ accessories directly. It will even stream video from a compatible First Alert or Ring doorbell to the wall display.
Worth knowing: the ElitePRO line is sold only through professional partners — you will not find it on a big-box shelf. An Equipment Interface Module lets us control extra stages and IAQ equipment without fishing new wire through finished walls, which is often the difference between a clean one-day job and tearing open a ceiling.
Equipment we install: ElitePRO S1200 flagship · ElitePRO S1100 / S1000 / S900 · T-Series (T4 / T6 Pro) · wireless room and outdoor sensors · Equipment Interface Modules · dual-fuel and radiant-compatible controls
Honeywell Home at 3R → · See all comfort add-ons → · honeywellhome.com ↗
Equipment Types, Explained
Brand names get thrown around a lot. The equipment category matters more — it determines what the job involves, what it costs, and what rebates apply. Here is the plain-English version.
| Equipment type | What it is | Best fit | Brands we install |
|---|---|---|---|
| Ductless mini-split | Outdoor unit connected by refrigerant lines to one or more wall, floor or cassette indoor heads. No ductwork. | Homes with no ducts, additions, converted attics, rooms that are always too hot or too cold. | Mitsubishi, Fujitsu, Bosch |
| Ducted heat pump | Heat pump outdoor unit feeding an air handler that uses your existing duct system. | Homes that already have ductwork and want to electrify with minimal disruption. | Bosch IDS, Mitsubishi, Trane |
| Cold-climate heat pump | A heat pump specifically rated to hold capacity at low outdoor temperatures — not all heat pumps are. | Any Massachusetts home relying on the heat pump as primary heat. Required for the best rebates. | Mitsubishi H2i, Fujitsu XLTH, Bosch IDS Ultra |
| Gas furnace + central AC | Two separate appliances sharing one duct system: furnace for heat, condenser and coil for cooling. | Gas-heated ducted homes replacing both at once, or homeowners who want a conventional system. | Trane |
| Condensing boiler | Wall-hung or floor unit heating water for baseboard, radiators or radiant floor. 95%+ efficient. | Hydronic homes. Most South Shore houses with baseboard heat. | Viessmann, Lochinvar, Laars, Navien |
| Combi boiler | One wall-hung unit that does both space heating and domestic hot water — no separate water heater. | Tight basements and mechanical closets. Reclaiming floor space. | Navien, Laars, Lochinvar |
| Tankless water heater | Heats water on demand. No tank to run out, no standby loss. | Households that run out of hot water, or want the tank footprint back. | Navien |
| Smart thermostat & controls | The interface and logic layer — scheduling, room sensors, zoning, IAQ accessory control. | Every home. Often fixes comfort complaints without touching the equipment. | Honeywell Home |
Not sure which row you are in? That is normal, and it is the first thing we sort out on a site visit. You can also run the numbers yourself with our rebate and sizing calculator, or read the Heat Pump Owner’s Guide.
We Service Every Major Brand
You do not have to own one of the brands above for us to help you. Our trucks carry universal parts and our techs work on whatever is in the basement. If it heats, cools, or makes hot water, we can diagnose and repair it — regardless of who installed it or how long ago.
Carrier · Bryant · Rheem · Ruud · A.O. Smith · Bradford White · Weil-McLain · Burnham · Buderus · Slant/Fin · Peerless · Daikin · LG · Samsung · Goodman · Amana · Lennox · York · Rinnai · Noritz · Taco · Grundfos · Honeywell · White-Rodgers · Nest · ecobee
Brand names and logos are the property of their respective owners and are referenced here only to describe the equipment 3R Plumbing & Mechanical installs and services.
Why Certifications Matter More Than Logos
Anyone can buy equipment and put a manufacturer’s logo on a website. Factory certification is different: it means our people trained on that manufacturer’s design, installation, and commissioning standards — and it is what unlocks the strongest warranties for you. Our Mitsubishi Diamond Contractor and Navien Certified statuses are earned and maintained, not purchased.
Just as important: the brand is only half the outcome. Sizing, refrigerant charge, venting, gas piping, and controls configuration decide whether great equipment actually performs. An oversized premium heat pump will short-cycle, dehumidify poorly, and cost more to run than a correctly sized mid-tier one. That is why we do room-by-room load work instead of rule-of-thumb sizing — and why we will sometimes talk you out of the more expensive option.
Not sure which brand fits your home?
We will give you an honest side-by-side for your actual house — where the price difference buys something real, and where it does not.