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  • Maximus
    • Maximus

    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.

    This product meets a stringent set of our company’s internally defined sustainability standards
    Maximus
    EARTH-FRIENDLY EFFICIENCY
    Super-high efficiency operation delivers savings and a reduced energy and energy cost carbon footprint1
    DEPENDABLE HOT WATER
    Heats water up to 2X faster,2 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
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    Unmatched Savings & So 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 and tax credits, everything about the Maximus is a win-win.

    Maximum Efficiency

    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

    Cost-Friendly Upgrade – Take advantage of available tax credits or local utility rebates, and enjoy estimated energy cost savings of up to $1,100+ over 12 years5

    Continuous Hot Water

    Delivers Continuous Hot Water – Heats water up to 2X as fast as a standard gas tank2 so you’ll have plenty of water to do the dishes, wash the laundry or even run continuous3 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

    Smart Controls

    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

    Pain-free for Plumbers

    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

    Did You Know?

    Maximus qualifies for tax credits and rebates in addition to reducing energy use up to 36%.

    Upgrading Is Easy

    Making the switch to Maximus is simple. All Maximus Super High Efficiency Gas Water Heaters have zero side clearance requirement—making them easy to install even where space is a concern, like in a closet.

    Knowledge is Power

    With integrated Wi-Fi, homeowners can avoid cold showers, detect leaks and more. It’s all possible with Maximus Super High Efficiency Gas Water Heater and the EcoNet® App.4

    EcoNet Home Screen

    Check and adjust temperature, set home or away, view any alerts, change operating mode and view available hot water

    Product Health Indicator

    Easily check if the unit is operating normally and when it’s time to call for service

    Energy Usage Tracking

    View weekly, monthly and yearly energy usage reports

    Advanced Diagnostics

    Allows plumbers to view detailed alerts and alarm codes while at the water heater to expedite service8

    Water Temperature Control

    Easily check and adjust water temperature and activate MaxMode™ as needed

    Setting Away and Home

    Save energy on water heating costs while away and return home to a tank full of perfectly hot water

    Contractor Information

    Helps you connect with customers by giving them an easy way to reach and share codes with you for repeat business and quicker service calls

    Learn more about easy
    homeowner financing options
    View Financing Options
    Degrees of Innovation
    At Rheem, we focus on innovating with intent, engineering solutions with lifetime sustainability in mind—from material selection to smart features to responsible recycling
    View Sustainability

    Ready to get the continuous hot water you need with the efficiency and smart features you deserve?

    Get Your Rheem Maximus Super High Efficiency Gas Water Heater Today