Water Heater & Tankless Installation

Tank and tankless water heater service. Gas and electric. Same-day emergency available. SE MA and Rhode Island.

Hot Water Problems Fixed Fast

No hot water is an emergency in most households. We treat it like one. Same-day service on repairs. If the unit cannot be saved, we can usually install a replacement within 24 hours.

For new installations, we work with standard tank heaters and tankless systems. Tankless units heat on demand and never run out, but cost more upfront and need specific gas line sizing. Tank heaters are proven and affordable. We walk you through the tradeoffs.

Gas line work, electrical connections, venting, and plumbing are all handled by our crew. Upgrading from electric to gas or adding a tankless unit that needs a larger gas line? No outside contractors. Need your electrical panel checked? Our electricians are on the same team.

Same-Day Emergency

Hot water failures treated as priority

Tank & Tankless

Both options installed and serviced

Gas & Electric

All fuel types

Full Plumbing + Electrical

All related work in-house

⭐⭐⭐⭐⭐ Donna is always so polite and accommodating. The technicians are knowledgeable and professional. We've used Triangle for years and wouldn't call anyone else.

Karen L.

Residential Customer

Get Your Free Assessment

Services Form — Triangle Mechanical (#5)

📞 Call (508) 501-7424

Fastest: call (508) 501-7424. Calls are answered around the clock, and emergencies get the on-call tech dispatched day or night.

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Our Installation Process & Brands

Free Assessment

We evaluate the space, measure rooms, and check your electrical panel. No cost, no obligation.

Custom System Design

We spec the right system for your home and put the price in writing before any work starts.

Professional Installation

Our licensed techs handle HVAC, electrical, and any panel upgrades. All in-house. No subcontractors.

System Training & Warranty

We walk you through the controls, register your warranty, and stand behind the work with a one-year labor guarantee.

What Does a Water Heater Cost in SE MA / RI?

Pricing depends on the unit type, fuel, and what your current setup looks like. Here are typical ranges for 2026:

Standard tank water heater (40-50 gallon): $1,800 to $3,500 installed. Gas or electric. Includes removal and disposal of the old unit, new connections, and code items like expansion tanks and drain pans where required.

Tankless water heater: $3,500 to $6,000 installed. The range depends mostly on gas line sizing. Tankless units draw more fuel when running, and older homes in Fall River, New Bedford, and Somerset often need the line upsized. That work is included in our quote, not a surprise added later.

Emergency replacement: same pricing, priority scheduling. No hot water gets same-day attention, and most swaps are finished in one visit.

Water Heater Quick Reference (2026)

Standard tank (40-50 gal)$1,800-$3,500

Tankless system$3,500-$6,000

Electric-to-gas conversionQuoted with gas line

Same-day emergency swapAvailable

Written quote before work begins. Old unit removal and disposal included.

Why Homeowners Choose Triangle for Water Heaters

In-House Electricians

Most HVAC installers sub out the panel work. That means two companies, two schedules, two invoices. Our own electricians handle the panel work. One company, one invoice.

Mass Save Participating Contractor

We know which systems qualify, what documentation the program requires, and where homeowners usually lose money by picking the wrong equipment tier. We confirm your eligibility before you spend a dollar.

55 Years. Not a Startup.

Rebate money brought a lot of new companies into this market. Triangle has been at 425 Pleasant Street in Fall River since 1970. When your compressor needs warranty service in 2030, we will still be here.

Four Trades, One Company

Getting a mini split and notice the water heater looks rough? Want a generator quote while we are there? Heating, cooling, plumbing, electrical, refrigeration. One call, one truck, one bill.

What Our Customers Say

⭐⭐⭐⭐⭐They diagnosed a heating problem we had for over 20 years that no one else could figure out — including one of the guys from This Old House. They didn't give up until they solved it. The owner Tom is wonderful and Neil is a real gem!

⭐⭐⭐⭐⭐Donna is always so polite and accommodating. The technicians are knowledgeable and professional. We've used Triangle for years and wouldn't call anyone else.

⭐⭐⭐⭐⭐ AJ, Chad, and Tony did an amazing job on our church's HVAC system. Professional, clean, and on time. Triangle treats every job like it matters.

⭐⭐⭐⭐⭐ Called on a Sunday night with no heat. They had someone at our house within an hour. Fixed it on the spot. Can't ask for more than that.

⭐⭐⭐⭐⭐ We use Triangle for all our rental properties. One call for heating, plumbing, electrical — they handle everything. Makes my life so much easier.

How much does a water heater replacement cost?

Tank: $1,800 to $3,500. Tankless: $3,500 to $6,000. Written quotes before work starts. Call (508) 501-7424.

Should I get a tankless water heater?

Makes sense for larger families or if you run out of hot water often. For 1-3 people, a standard tank is usually the better value.

How long does a water heater last?

Tank: 8-12 years. Tankless: 15-20 years with maintenance. Leaking, rusty water, or popping sounds mean it is near the end.

Do you offer emergency water heater service?

Yes. Leaks and total failures are emergencies we handle 24/7. Call (508) 501-7424.

Can you convert my electric water heater to gas?

Yes, if natural gas is available at your home. Our crew handles the gas line, venting, and plumbing in one visit since we hold both licenses. Conversion adds to the upfront cost but usually pays back in lower operating bills.

What size water heater do I need?

A 40-gallon tank covers most households of one to three people. Larger families, or homes with soaking tubs, usually need 50 to 75 gallons or a tankless unit that never runs out. We size it during the assessment so you are not paying to heat water you never use.

Ready to Get Started?

Whether you need an emergency repair, a new installation, or a second opinion, Triangle is here to help. One call handles it all.