Marathon (Rheem) Water Heaters Review 2026
Best lifetime tank warranty
UEF Range
0.9–0.95
Types
1
Price Range
$$$
Tank Warranty
Lifetime
Origin
USA
Why Marathon (Rheem)?
Best lifetime tank warranty. Trusted by Nassau County homeowners since 1925.
Part of Rheem Manufacturing
Is Marathon (Rheem) water heater any good?
Yes — Marathon (Rheem) water heaters are a premium-tier choice. Our editorial score is 4.2/5 based on published efficiency, climate fit, warranty, features, and price positioning. Marathon (Rheem) is associated with Rheem Manufacturing; confirm the exact model platform, parts path, and coverage rather than assuming they are shared. For a Long Island home, compare the exact matched system and written installation scope because design and commissioning can matter as much as the badge on the equipment.
Our Review Process
Ratings are editorial comparison scores—not customer reviews, installation counts, or manufacturer endorsements.
Marathon (Rheem) Water Heater Planning for Nassau County & Covered Western Suffolk Areas
A useful Marathon (Rheem) comparison starts with the exact indoor and outdoor model pairing—not the brand name alone. Home+ Air & Heat can review Marathon (Rheem) water heater options for homes in our covered Nassau County and western Suffolk service areas, then document whether the proposed equipment, capacity, electrical scope, and installation approach fit the project.
Before work is authorized, ask for the design method, AHRI match where applicable, installer or dealer qualification required by the manufacturer, registration responsibility, parts coverage, labor coverage, exclusions, and current incentive assumptions in writing. Those details vary by model, project, contractor status, installation date, and current program rules.
Expert Review: Marathon (Rheem)
First-hand experience from our Nassau County water heater installation team.
Marathon (Rheem) Water Heaters: An Expert Review by Home+ Air & Heat
Our Field Experience in Nassau County
Here at Home+ Air & Heat, we’ve been installing water heaters across Jericho and wider Nassau County for years, and Marathon (Rheem) units are a product we know well. We've seen firsthand how these premium electric tank water heaters perform in the varied homes across Long Island. Our technicians appreciate their robust build and the straightforward installation process, despite their heavier weight compared to some other brands. The most common feedback we get from homeowners after installation is their satisfaction with consistent hot water and, over time, the peace of mind knowing they won't be dealing with tank corrosion.
Handling Long Island's Hard Water and Coastal Conditions
Long Island’s water, particularly in Nassau County, is known for being hard, which can be a significant challenge for conventional water heaters. This is where Marathon truly shines. Their unique polybutene tank construction means there
Blake Ruwali
EPA 608-Certified HVAC Technician
Pros
- Lifetime tank warranty — never rusts
- Polybutene tank construction
- Excellent insulation
- No anode rod maintenance
Cons
- Electric only
- Higher upfront cost
- Heavy unit
- No gas models
Marathon (Rheem) Key Specifications
UEF Range
0.9–0.95
Price (Installed)
$1,500–$3,000
Tank Warranty
Lifetime
Types Available
1
Marathon (Rheem) Water Heater Models We Install
Detailed specs and pricing for Marathon (Rheem) models available for Nassau County installation.
Marathon 85-Gallon Lifetime Electric Tank
Installed Price
$2,200–$3,200
The only residential water heater with a lifetime tank warranty — never rusts.
UEF
0.93
1st Hr Rating
102 gal
Capacity
85 gal
Pros
- Lifetime tank warranty
- No anode rod needed
- Will not rust, corrode, or leak
Cons
- Electric only
- Very large footprint
- Heavy (150+ lbs dry)
Marathon 50-Gallon Lifetime Electric Tank
Installed Price
$1,800–$2,600
Standard-size lifetime-warranted electric tank for typical households.
UEF
0.95
1st Hr Rating
67 gal
Capacity
50 gal
Pros
- Same lifetime warranty
- More manageable size
- High efficiency
Cons
- Electric only
- Limited availability
- Premium pricing
Marathon (Rheem) Warranty Coverage
Tank
Lifetime
Parts
Lifetime
Labor
N/A
Warranty terms require professional installation and product registration. We handle all warranty registration for our customers.
Marathon (Rheem) Cost & Pricing
Price Range (Installed)
$1,500–$3,000
Price Tier
$$$
Tier
Premium
Prices reflect typical Nassau County installations including labor, materials, and permits. Federal 25C ended after 2025; current heat pump water-heater incentives vary by model and program.
Marathon (Rheem) Brand History
Founded in 1925
Marathon (Rheem) has been manufacturing water heaters for over 101 years. Proudly American-made.
Part of Rheem Manufacturing
Rheem Manufacturing also manufactures Rheem, Ruud, Richmond — sharing engineering and manufacturing platforms.
How Marathon (Rheem) Compares
Who Should Choose Marathon (Rheem)?
Large Families
Marathon (Rheem) tankless units provide unlimited hot water for households of 4+.
Small Homes
Marathon (Rheem)'s smaller tank models fit tight utility closets in older Long Island homes.
Energy Savings
Marathon (Rheem)'s high-efficiency models help cut energy bills with UEF ratings up to 0.95.
Marathon (Rheem) FAQs
Ready for a Marathon (Rheem) Water Heater?
Get a free, no-pressure quote from our certified technicians who install Marathon (Rheem) water heaters regularly.
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Get a Marathon (Rheem) Quote
Free estimates • Same-day service available
The brand matters less than the installer
A great water heater installer on Long Island will outperform a premium unit installed poorly. Use the verification checklist and three-estimate worksheet before you sign anything.
Open the contractor comparison guideMarathon (Rheem) Heater Types
🔥 Water Heater Buying Guide
Tank vs tankless vs heat pump — find the right water heater for your Nassau County home.
Read the Guide →About This Review
Amy Milani
Writer
Blake Ruwali
EPA 608-Certified Reviewer
Updated:
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