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In our Rheem gas water heater review, we'll look in depth at the Rheem model RTG-64DVLP tankless water heater and see how it measures up against similar units. Tankless water heaters are unique and their popularity is exploding.

Energy conscious people have long considered on-demand water heating an efficient means to deliver an endless supply of hot water into their homes, without the unnecessary waste of energy found with use of conventional water heaters.

Comparison Table

What Is The Rheem Gas Water Heater?

A majority of people in the United States associate water heaters with large tanks of hot water taking up space in a basement or closet. This water heater keeps water hot and ready for use whenever it's needed. The Rheem gas water heater heats water on demand, only when you need it, and doesn't store water.


The Rheem tankless water heater responds instantly when hot water is requested. The heater uses either electricity or gas to power its heater. They're powerful heaters and instantly heat water as it passes through the unit. As with a conventional water heater, it directly relates hot water delivery time to the distance between the heater and faucet.


A reason for their popularity is their efficiency. A tankless water heater turns on only when a hot water faucet is opened, and turns off when it's closed. Compare that to storing and heating hot water regardless if it's needed. Tankless water heaters don't waste energy, save money, and you'll always have a never-ending supply of hot water.

Product Specs

The Rheem RTG series which includes the model in our Rheem gas water heater review is a direct vent propane style water heater. They feature ultra-low NOx (oxides of nitrogen) which is an atmospheric pollutant.


They rate RTG models as mid-efficiency gas water heaters specifically designed for homes with one or two bathrooms. They rate their efficiency at 82% thanks to its stainless steel condensing heat exchanger.


The RTG-64 includes self-diagnostics, helpful for troubleshooting problems quickly, and a built-in electric blower. It's rated at 6.4 gallons per minute at a 35 degree Fahrenheit rise, and 5.6 gallons per minute at a 45 degree Fahrenheit rise. The heater produces 11,000 - 150,000 max BTU output.

Pricing

The RTG-64DVLP price falls into the range of $ - $$$, but prices vary by region and availability. The unit is available from retailers such as The Home Depot and online at the Plumber's Crib.

How It Compares

We picked a few similar products available on the market to see how they compare.


Rheem Gas Water Heater

Rheem RTG-84DVP Low Nox Direct Vent Tankless Water Heater Liquid...
  • Minimum flow rate of .26 gpm, .40 gpm minimum activation flow rate, 180,000 BTU
  • Includes UMC-117 remote control and 10-feet of thermostat wire
  • Vent termination kit required

  • performance
  • eeficiency
  • Design Quality
  • Warranty

4.8 stars

Rheem's RTG efficiency is a big talking point in our review because the unit shuts down immediately after demand is gone. In effect, its on again, off again operation removes the waste and added cost for fuel (gas or electric). A gas water heater capable of using energy only when needed, and in small amounts, impressed us.

Pros

  • Energy savings
  • Low NOx emission
  • Space savings
  • Easy to install

Cons

  • Additional faucets require size upgrade
  • Requires dedicated double-wall stainless vent
  • Some parts are unavailable

AO Smith GPHE-50 Water Heater

AO Smith GPHE-50 Water Heater with Residential High Efficiency Power...
  • Power-vent
  • 90-Percent thermal efficiency
  • Sidewall and vertical vent options

The AO Smith GPHE-50 gas water heater is designed for normal use by up to a four-person household. We included this model in our Rheem gas water heater review for comparison. We like the thermal efficiency of 90% and its claim of 3 gallons of hot water per minute. The high efficiency adds to energy savings and lower operating costs. A 50-gallon water heater is normally a taller than average unit, and this model is slightly taller than average but narrower to take up less floor space. Its 27-inch diameter body allows installation in tighter spaces without sacrificing scarce storage area.


This AO Smith water heater operates similar to standard models and relies on its gas-fueled burner at the bottom of the tank. The spiral heat exchanger is located in the middle of the tank for efficient heat distribution and earns a 96% thermal efficiency rating, higher than standard models at around 80% efficiency. We like the easy-to-use Intelli-Vent Gas Control for temperature and system adjustments.

  • performance
  • eeficiency
  • Design Quality
  • Warranty

5.0 stars

AO Smith provides a 6-year limited tank and parts warranty, but it does not cover labor.

Pros

  • Powered vent
  • 90-Percent thermal efficiency
  • Sidewall and vertical vent options
  • Includes side taps for simple installation

Cons

  • Reliability
  • Reports of warranty issues
  • Longevity

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater,...
  • INDOOR installation only. Fuel Type: NATURAL GAS.
  • Concentric or PVC venting option
  • Up to 0.96 Energy Factor/Up to 0.92 Uniform Energy Factor

Next up in our Rheem gas water heater review is the Rinnai RUC98iN. This is an indoor gas tankless water heater for either residential or commercial use. Fuel requirements are propane or natural gas and offer multiple venting options. A handy feature is a control featuring a digital display with power, temperature, and gas control buttons. It also has a lockout function for temperature settings.


Venting for this unit are concentric or twin-pipe PVC, and it complies with nitrogen oxide emission standards. We noticed larger gas and water supply fittings required than what is found on similar tankless designs. It's obvious this unit is heavier and larger than most designs in this category, but it's more powerful than most, too.


This water heater's flow rate is a surprising 0.26 to 9.8 gallons per minute and activates at a flow rate of 0.4 gallons per minute. This is a pricey unit with installation and warranty restrictions, but makes up for any inconvenience with its ability to provide steady hot water in homes with multiple bathrooms and faucets. Its temperature ratings include a heating capacity up to 140 degrees Fahrenheit, and to 140 degrees Fahrenheit in its commercial version.

  • performance
  • eeficiency
  • Design Quality
  • Warranty

4.8 stars

The RUC98iN boasts a mega-burner generating up to 199,000 BTUs, adjustable down to 15,200 BTUs. The RUC models feature an eco-friendly burner and its modulating burner allows it power down to a low of 15,200 BTUs. Temperatures are controlled by a dip switch or the control built into the front panel. If a failure occurs, error codes are accessible from the control to assist troubleshooting. An external pump permits fast hot water delivery and recirculation when necessary.

Pros

  • Easy to adjust settings
  • Powerful and efficient
  • Residential and commercial versions

Cons

  • Difficult installation
  • Service provided by authorized personnel
  • Heavy and bulky

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

Takagi T-K4-IN-NG Indoor Tankless Water Heater, Natural Gas
  • Indoor installation only; Direct-vent conversion optional
  • 11,000 - 190,000 BTU/hr
  • 0.82 energy factor

The last product in our Rheem gas water heater review is the Takagi T-KJr2-IN-NG natural gas indoor tankless water heater. The most impressive feature about this model is not a feature at all. It's the customer service. They care about their customers and the customer's needs.


Our best impression of this model is the design and functionality. Once installed, it works flawlessly, albeit struggling to keep up with a high demand for hot water. If the water supply is kept constant and doesn't overwhelm the heater, the unit performs well. In larger homes, higher water pressure may limit its ability to supply constant hot water.

  • performance
  • eeficiency
  • Design Quality
  • Warranty

5.0 stars

Takagi provides a 15-year parts warranty on the heat exchanger, five years on parts, and one year reimbursed labor for a single-family residence.

Pros

  • Durable
  • Customer service
  • Inexpensive

Cons

  • Installation by Takagi required
  • Meant for small homes
  • Tricky venting installation

Rheem Gas Water Heater Review | Conclusion

In our Rheem gas water heater review, we found the Rheem RTG-64DVLP gas water heater efficient, capable, and affordable. It passed our tests with expected results and we rated each finding accordingly. We will end our Rheem gas water heater review by awarding model RTG-64DVLP 4.8 stars out of 5.0 possible.

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