Rheem vs. RinnaiHow Do Two Hot Water System Giants Compare

    Nobody wants to deal with the annoyance of running out of hot water while in the shower. When you have a water heater that isn’t reliable, this is exactly what you can expect. This is one of the reasons that many people choose to invest in a tankless water heater from a major manufacturer.

    Two of the most commonly chosen brands are Rinnai and Rheem. If you’ve been searching for the right tankless water heater, you’re likely familiar with these two brands. We’re going to take a look at the two of them and what the differences are so you can make an educated decision.


    Looking at the Rinnai RUC98iN and the Rheem RTGH-95DVLD gives us a basis of comparison for you. As far as design goes, there isn’t much difference between the two. Both are compact and sleek, which makes them easy to fit any household. Both offer a stainless-steel finish for strength and durability.

    Source of Fuel

    Both of these water heaters use gas as a fuel source. The Rheem can be used with propane and natural gas. It also comes with multiple venting options. The Rinnai water heater comes with a gas line compatibility mode which can make the installation extra simple.

    Capacity for Heating

    Each of these water heaters can heat water from 95 to 140 degrees Fahrenheit. The only real difference is that the model from Rheem also comes with a cold temperature limit of -30 degrees Fahrenheit.

    Energy Efficiency

    Since both companies offer tankless models, that means both are able to help you save on your monthly energy bills. Tankless water heaters only use energy when actually required to heat water, which can quickly drop your bills when switching from a typical water heater with a tank.

    Extra Considerations

    The Rinnai model has an efficient design, flexible installation, zero-maintenance cost and can switch between natural gas and propane. The Rheem has a heat-condensing boy, high-altitude performance, and can be operated with a remote control.

    If you still aren’t sure which unit is right for you, get in touch with your local plumber. They will also be able to install your new water heater in your home.