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INNOVATION

Maximum Efficiency. Powerful Performance Smart Control.

In Latin, “Maximus” means “the greatest,” and the Rheem^® Maximus^™ Super High Efficiency Gas Water Heater lives up to its name. It’s powerful enough to deliver dependable hot water, with unmatched efficiency in a residential gas water heater. So when you’re looking for a new water heater, choose the greatest.

Earth Friendly Efficiency

Super-high efficiency operation delivers energy and energy cost savings and a reduced carbon footprint¹

Dependable Hot Water

Heats water up to 2X faster², so you’ll have plenty of water to do the dishes, wash the laundry or even run continuous³ back-to-back showers

EcoNet^® Smart Monitoring

Exclusive technology provides control and alerts via both mobile device⁴ and full-color LCD display

Easy Installation

Plumber-friendly design makes installation faster and more affordable with versatile and built-in features

Maximus^®

Unmatched Savings & Much More

Save upfront and continue saving for years to come with The Rheem^® Maximus^™ Super High Efficiency Gas Water Heater. From big energy cost savings to installation savings, everything about the Maximus is a win-win.

Super High Efficiency – High efficiency water heating with up to 0.90 UEF for carbon footprint and energy use reduction of up to 36%¹

Delivers Continuous Hot Water – Heats water up to 2X faster than a standard gas tank ² so you’ll have plenty of water to do the dishes, wash the laundry or even run continuous ³ back-to-back showers

MaxMode^™– Gives the water heater the boost it needs to produce up to 15% more hot water and keep up, even if demand gets high—perfect for those weekends with house guests

Integrated Wi-Fi – Real-time service alerts and control from anywhere with the EcoNet App⁴

Added Protection – Built-in 360^° LeakSense ^™ water leak detection system detects any leak, large or small, internal or external⁶; plus Maximus is FVIR compliant

Hot Water Availability Indicator –Shower with confidence knowing there is enough hot water available

Leak Prevention –Available LeakGuard^™accessory stops water leaks before they become a problem, limiting leaks to 20 oz. or less⁷

0" Clearance on Sides – Fits in a closet

Venting Versatility – Installs as Power Vent or Power Direct Vent, so you only have to carry one product on your truck

Startup Verification – Be sure your customer is up and running before you leave the home

Easy Diagnostics – View advanced diagnostic information⁸ and detect outgoing water temperature

Fast and Easy Service – Fully serviceable from the front

Specifications Sheet

Use and Care Manual

Product Information Page

Consumer Literature

Specifications Sheet French

33 %

Energy Reduction

Maximus can reduce energy use up to 33%.

360 °

Smart System

Built-in 360° LeakSense^™ water leak detection system

75 %

Eco Impact

Reduce your NOx emissions up to 75%.⁹

Performance

Maximus heats water up to 2X faster compared to conventional vent gas tanks.

VIDEO

Rheem Maximus Super High Efficiency Gas Water Heater.

Designed by plumbers and engineered by Rheem, it simplifies installation and offers a high-performance solution for homeowners, while delivering more hot water and super high efficiency while being easy to service.