Best Tankless Water Heater Installation Companies in 2026: 6 Reviewed

If you want the best tankless water heater installation companies in 2026, Roto-Rooter and manufacturer-certified local plumbers lead — Roto-Rooter for reach (all 50 states plus Washington (learn more about best storm shutter installation companies in 2026: top 8 for hurricane protection) (learn more about best boiler installation and repair companies of 2026: brands, costs, and how to hire) (learn more about best home ev charger installation companies of 2026) (learn more about best gutter installation services of 2026 (cost & company rankings)) (learn more about best deck builders near me in 2026 (cost, reviews & how to choose)) (learn more about how to hire a contractor: the complete guide to finding, vetting, and paying a pro (2026)), D.C., 24/7) and brand-certified independents for warranty protection, since Rinnai, Navien, and Rheem tie full coverage to certified work. We compared six installers on coverage, licensing, pricing clarity, warranty handling, and permits. Most homes pay $1,200 to $3,800 installed, averaging about $2,632. One change matters this year: the federal 25C tax credit is gone, so budget around utility rebates instead.

How We Ranked These Installers

Criteria	Weight	Why It Matters
Service coverage	High	An installer you cannot book is not an option.
Licensing and certification	High	Gas venting is life-safety work, and certification protects the warranty.
Pricing clarity	High	Up-front quotes prevent surprise change orders.
Warranty handling	Medium	Long heat exchanger warranties hold only if the install met spec.
Permits and inspections	Medium	Most cities require a permit for gas or electrical changes.

Data sources: HomeGuide and Angi 2026 cost data, installer directories from Rinnai, Navien, and Rheem, IRS guidance on the Energy Efficient Home Improvement Credit, and rebate programs from UGI Utilities, ThermWise, and SoCalGas.

1. Roto-Rooter — Widest Coverage and True 24/7 Availability

Best for: Fast service, or homes outside major metros
Coverage: All 50 states and Washington, D.C.

Roto-Rooter is the only company here covering all 50 states and Washington, D.C., dispatching 24 hours a day, 365 days a year. Technicians install and repair both gas and electric tankless units. For a water heater that failed on a Sunday night, this is the fastest route to a licensed plumber.

Pros

• Nationwide footprint, including smaller markets franchises skip
• Removes the old tank and installs the new unit in one visit

Cons

• Pricing is quoted per location, so nearby branches differ on the same job
• Best known for drains, so tankless depth varies by technician

Who This Is Best For

Choose Roto-Rooter when speed beats shopping the price. With a few weeks and a specific brand in mind, a certified specialist will do a more tailored job.

2. Manufacturer-Certified Local Plumbers — Best Warranty Protection

Best for: Homeowners committed to a specific brand
How to find them: Rinnai, Navien, and Rheem each publish a ZIP-code installer finder

Every major brand keeps a directory of trained installers, and manufacturers generally tie full warranty coverage to a certified install. Rinnai lists pros by ZIP code, Navien publishes its certified list, and Rheem maintains a qualified contractor network. Many local shops carry all three certifications.

Pros

• Brand-specific training on venting, gas sizing, and error codes
• Protects the heat exchanger warranty, the costliest part to replace

Cons

• Quality varies shop to shop, so check reviews and license status yourself
• Smaller crews mean longer lead times and limited after-hours help

Who This Is Best For

The best route for a planned replacement when you can wait a week or two. A poor fit for emergencies or for bundling plumbing, HVAC, and electrical together.

3. Benjamin Franklin Plumbing — On-Time Guarantee, Locally Owned

Best for: Homeowners who need a firm arrival window
Structure: Franchise network, each location locally owned

Benjamin Franklin Plumbing runs locations across Texas, Alabama, Florida, Minnesota, and dozens of other markets. Every location is locally owned, and the brand is built around punctuality — its long-running guarantee credits the customer when a plumber arrives late.

Pros

• On-time guarantee gives you a real remedy for a missed window
• Licensed, insured plumbers with 24/7 service at most locations

Cons

• Independently owned locations mean pricing and warranty terms are not uniform
• No presence in some rural markets

Who This Is Best For

Good for homeowners who cannot take a full day off work. Less useful for comparing quotes across a metro area, since franchises price differently.

4. Mr. Rooter Plumbing — Flat-Rate Pricing, No Overtime Charges

Best for: Homeowners who want the number before the wrench comes out
Pricing model: Flat rate by the job, not by the hour

Mr. Rooter services tankless units, standard tanks, and hot water dispensers across the United States and Canada. Its flat-rate model prices the job rather than the hour, removing any incentive to stretch the work and eliminating overtime surcharges on nights and weekends.

Pros

• A slow job does not become a more expensive job
• Written parts and workmanship guarantee, no overtime charges

Cons

• Flat rates can run higher than an hourly independent on a simple swap
• Tankless volume varies by franchise, so ask how many they install monthly

Who This Is Best For

Strong when budget certainty matters and the job may get complicated — old venting, a tight closet, a gas line needing upsizing. On a simple install, an independent may cost less.

5. ARS/Rescue Rooter — One Crew for Plumbing and HVAC

Best for: Pairing a water heater swap with HVAC work
Coverage: 24 states

ARS/Rescue Rooter runs plumbing and HVAC divisions from the same branches across 24 states. That matters for tankless, because a gas unit often needs new venting and sometimes a larger gas line — work that overlaps with HVAC skills. ARS also fulfills many Home Depot water heater installations.

Pros

• Plumbing and HVAC under one roof simplifies venting and gas line work
• Maintenance plans that include annual descaling

Cons

• Available in roughly half the country
• Service plan upselling is common, so decline what you do not need

Who This Is Best For

Best when the project touches more than plumbing, or when a furnace replacement is already planned. Skip it in the 26 states outside its footprint.

6. The Home Depot Home Services — Simplest Path for First-Timers

Best for: One point of contact and financing in one place
Model: Retail-managed install using vetted local contractors

Home Depot sells the unit and manages installation through vetted local plumbing contractors, including ARS/Rescue Rooter in many markets. You get one invoice, one warranty contact, and store financing. The trade-off is that the retailer, not the plumber, owns the relationship.

Pros

• One quote covering unit, labor, haul-away, and permits
• Retailer-backed labor warranty on top of the manufacturer warranty

Cons

• Model selection limited to what the store stocks, and scheduling slows emergencies
• The contractor may not be brand-certified for your unit

Who This Is Best For

A sensible first tankless purchase when simplicity beats optimization. Not right if you want a specific high-efficiency model, or need hot water back today.

Quick Comparison

Company	Coverage	Pricing Model	24/7 Service	Best For
Roto-Rooter	All 50 states + D.C.	Quoted per branch	Yes	Emergency replacement
Certified local plumbers	Varies by ZIP code	Local market rate	Rarely	Warranty protection
Benjamin Franklin Plumbing	Multi-state franchise	Up-front quote	Most locations	Scheduling reliability
Mr. Rooter Plumbing	U.S. and Canada	Flat rate per job	Most locations	Budget certainty
ARS/Rescue Rooter	24 states	Quoted per branch	Yes	Plumbing + HVAC together
Home Depot Home Services	Most U.S. metros	Bundled retail quote	No	First-time buyers

How We Researched This

We combined 2026 cost data from HomeGuide and Angi, installer directories from Rinnai, Navien, and Rheem, IRS guidance on the Energy Efficient Home Improvement Credit, and active utility rebate programs. We limited the list to companies with verifiable multi-state footprints and published licensing, and excluded lead-generation directories that resell your contact information rather than do the work. Last updated: August 18, 2026. We review this guide twice a year.

Frequently Asked Questions

How much does tankless water heater installation cost in 2026?

Most homeowners pay $1,200 to $3,800 installed, averaging near $2,632. Whole-house gas systems run $2,700 to $5,500. Whole-house electric systems run $1,800 to $4,200.

Is a gas or electric tankless water heater cheaper to install?

Electric costs roughly 30% to 40% less, because there is no venting or gas line work. Gas units deliver higher flow rates, which matters in larger homes and colder climates.

Is there a federal tax credit for tankless water heaters in 2026?

No. The One Big Beautiful Bill Act, signed in July 2025, ended the Section 25C credit for property placed in service after December 31, 2025. Units installed on or before that date can still be claimed on a 2025 return.

What rebates are available in 2026?

Utility rebates. UGI Utilities offers $400 for an ENERGY STAR certified gas tankless unit for Pennsylvania residential gas customers installing before September 30, 2026. ThermWise offers $300 in Utah, Idaho, and Wyoming. SoCalGas tiers its rebate by Uniform Energy Factor rating.

Why is labor such a large share of the cost?

Labor, venting, gas line upgrades, and permits typically add 50% to 60% on top of the equipment price. A tankless unit vents differently and often needs a larger gas supply line.

Do I need a permit?

Usually yes. Most cities require one any time gas piping, venting, or a dedicated electrical circuit changes. A licensed installer should pull it and schedule the inspection.

Does an uncertified installer void my warranty?

It can. Manufacturers generally tie full coverage to installation by a certified pro, and the heat exchanger carries the longest warranty. Ask for the certification number before you sign.

Does my electrical panel need an upgrade for an electric unit?

Often, yes. Whole-house electric tankless units draw heavy amperage and usually need multiple dedicated breakers. Ask the installer to check panel capacity before you commit.

How do I confirm an installer is licensed and insured?

Ask for the license number and verify it with your state or city licensing board — most offer free online lookup. Then request a certificate of insurance naming general liability and workers'' compensation.

Important Disclosures

This content is for informational purposes only and does not constitute financial, tax, or professional contracting advice. Costs, rebate amounts, tax rules, and service areas change frequently and vary by state and utility. Verify rebate terms with your utility and licensing with your state board before hiring. Consult a licensed plumber for guidance specific to your home. Some links on this page may be affiliate links. This does not influence our rankings — our methodology is described above.

Written and reviewed by the HomeSimple Editorial Team. We research home services the way a neighbor would: by checking licenses, reading the fine print, and asking what the job actually costs. Last updated: August 18, 2026.