Rinnai Tankless Gas Water Heaters

Introducing Rinnai—a brand that has always been known for innovation. If you’re looking for a company that is dedicated to finding the best technology to make great tankless water heaters, then you’ve found it in Rinnai. We hope that our research saves you some time and effort in your quest for the best tankless water heater.

Rinnai Manufacturing Co. LTD was founded in 1920 in Japan, and in 1921 it was the first domestic manufacturer to introduce a tankless water heater. Interestingly, in 1971 the company partnered with the Osaka Gas Co. Ltd. and successfully produced the first convection oven. The Los Angeles offices opened in 1974, giving birth to the Rinnai America Corporation. After moving operations to Georgia in 1987, the company sold its first tankless water heater in 1999.

2004 was a banner year for Rinnai, as its presence in the water heater industry was not only firmly established but gained great brand reach by winning the #1 most popular product by Builder Magazine. Impressively, Rinnai went on to win this #1 position four more years in a row. 2010 brought more notoriety to the name: Rinnai was awarded Builder Magazine’s 2010 Brand Leader in Quality, and won Green Builder Magazine’s Hot 50 Products of 2010 for the RC80HPe and Bestcovery.com’s Best Whole-House Tankless Water Heater for the R75LSi.

But that didn’t slow down Rinnai in the marketplace. It innovated and brought not only commercial water heaters to the table, but also a few hybrid models. Professional Builder, a highly regarded building and design magazine, named the Rinnai hybrid tank-tankless water heater one of the 100 Best New Products of 2014. Rinnai is now the number-one selling brand of tankless water heaters in the United States and Canada, and is in Professional Remodeler magazine’s Top 100 Products of 2016 (mechanical and electrical category).

To help you with your search for the best tankless water heater to fit your needs, we have pulled together some Rinnai tankless water heater reviews, including some current bestsellers.

  • 4.5 Customer Rating
  • Rinnai RUC98iN
  • Dimensions: 10 x 18.5 x 26 inches
  • Flow Rate: 9.8 GPM
  • Power Source: Gas-Powered
  • Weight: 82 pounds
  • Made In: Japan
  • Warranty: 12-year heat exchanger, 5-year parts, 1-year labor
  • 3.5 Customer Rating
  • Rinnai RL94iN
  • Dimensions: 9.3 x 14 x 23 inches
  • Flow Rate: 9.4 GPM
  • Power Source: Gas-Powered
  • Weight: 5 pounds
  • Made In: Japan
  • Warranty: 12-Year Warranty on Heat Exchanger, 5 Year Parts, 1 Year Labor
  • 4 Customer Rating
  • Rinnai RUR98iN
  • Dimensions: 12.5 x 10 x 26 inches
  • Flow Rate: 9.8 GPM
  • Power Source: Gas-Powered
  • Weight: 93 pounds
  • Made In: Japan
  • Warranty: 12-year heat exchanger, 5-year parts, 1-year labor
  • 4 Customer Rating
  • Rinnai RL75iN
  • Dimensions: 14 x 9.3 x 23 inches
  • Flow Rate: 9.4 gallons
  • Power Source: Gas-Powered
  • Weight: 65.9 pounds
  • Made In: Japan
  • Warranty: 12-Year Warranty Heat Exchanger, 5 Year Parts, 1 Year Labor
  • 4 Customer Rating
  • Rinnai RL94eN
  • Dimensions: 9.3 x 14 x 23 inches
  • Flow Rate: 9.4 GPM
  • Power Source: Gas-Powered
  • Weight: 46 pounds
  • Made In: Japan
  • Warranty: 12-Year Warranty Heat Exchanger, 5 Year Parts, 1 Year Labor
  • 4.5 Customer Rating
  • Rinnai V65EP
  • Dimensions: 9 x 14 x 23 inches
  • Flow Rate: 6.6 GPM
  • Power Source: Gas-Powered
  • Weight: 60 pounds
  • Made In: Japan
  • Warranty: Manufacturers

Rinnai RUC98iN Concentric Twin Pipe Natural Gas Tankless Water Heater

While this unit is at the higher end of the price range,users rave about its features. Rinnai is pretty proud of the fact that they are the only water tank manufacturer to offer two installation options in one unit, saving you the hassle of buying extra parts. This Rinnai tankless water heater offers two options for natural gas venting—both concentric and PVC pipe options are found on the top of the unit for convenient access during installation.

This concentric vent design is very unique for its important safety benefits. The concentric vent means that it holds both intake and outtake pipes, so the vent is cool to the touch as the warm air is insulated inside. If an intake or outtake pipe develops a leak, the air stays in the concentric vent and does not enter the home. The dangers of a gas leak are immeasurable; from fire and combustion to carbon monoxide poisoning.

The Rinnai RUC98iN is quiet, compact, and gives you immediate hot water when you want it. Because the water is being heated on demand, there can be a slight drop in water pressure if multiple showers are running at the same time. Also, be sure to give a tankless unit about 8-10 seconds to clear the cold water out of the pipes before jumping into the shower.

The Rinnai RUC98iN is certified through Energy Star with a rating of 0.96. This tankless water heater will not only work to save you money on your energy bill, but will also save space—it is about the size of a small suitcase at 10 x 18.5 x 26 inches.

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Rinnai RL94iN Natural Gas Tankless Water Heater

This Rinnai unit is for indoor installation only. Its natural gas energy source and its 9.4 gallons per minute (GPM) water flow capacity put it at the top end of the price range.

If you are looking for a good tankless water heater, you’ll naturally want to know that the RL95iN gas range is 9,900-199,000 BTU and the unit has an energy factor (EF) of 0.83, so it is Energy-Star qualified. The RL95iN is also engineered with enhanced scale detection protection to help reduce damage to the unit and parts. Even so, it wouldn’t hurt to install external filters or water softeners if you have hard water in your area.

Rinnai has created an integrated, trademarked Circ-Logic recirculation program, which essentially cycles an external pump at pre-set intervals and temperatures to reduce strain on the water heater and keep your water at comfortable temperature levels. The RL95iN also has a minimum activation level of 0.4 GPM, which means you shouldn’t have to run the tap too long to get a bit of hot water, for example, to wash a few dishes. That sensitivity is a premium feature that was a likely factor in setting RL94iN’s price point.

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Rinnai RUR98iN Ultra Series Condensing Indoor Natural Gas Tankless Water Heater

The Ultra series from Rinnai offers the best of its line—and you’ll see that reflected in the price. The RUR98iN is at the top of the price range. Now, you’ll get the premium features that you’d expect for that top price. For those in warmer climates, you can expect a max of 9.8 GPM for your water flow. This impressive unit is the creme de la creme—it will easily power up to four showerheads in a busy home. This great tankless water heater would be best suited for a large home, probably 2,000-2,500 square feet, or a home with three to four bathrooms and high hot water demands.

It’s also best to point out that condensing heaters always have a higher efficiency, and the RUR98iN does not disappoint—this Ultra water heater offers not one but two heat exchangers! You can expect up to a 0.96 EF from the RUR98iN. The RUR98iN has also been formulated to reduce the time you wait for hot water. This re-circulation feature (with or without a dedicated re-circulation line) uses thermal bypass technology with an integrated pump, internal bypass line, and a thermal bypass valve. All that really means is that all the parts inside are made to get hot water to your tap or showerhead faster, so you don’t spend an extra 10-20 seconds with cold or lukewarm water.

This model also offers two venting options for the installer—both concentric and PVC hookups are found on the top of the RUR98iN, so you can choose your venting method. Or, if you need to change which type later on, there’s no costly changes, just a quick switch out of the pipes. For this capacity of tankless water heater, all of the gas and water line hookups are for ¾-inch pipe.

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Rinnai RL75iN Natural Gas Tankless Water Heater

We’re moving into Rinnai’s Luxury line with the RL75iN. With this tankless water heater line you’re going to find yourself in the middle of the price range for natural gas heaters. Since this is an indoor unit, it’d be a great fit for those in a cold climate who need the power of a natural gas heater, but can’t install outdoors.

The RL75iN is Energy-Star qualified and will give you an EF of 0.82. While utility appliances might not be as visible as your kitchen appliances, this one isn’t bad to look at — it has a pretty sleek silver cover and the digital controller is front and center.

Rinnai has also engineered an enhanced scale detection feature for your peace of mind. One of the most important responsibilities of owning a tankless water heater is to schedule regular maintenance, as the minerals and buildup in your water can really damage the heating elements. This will go a long way to reduce the chance of serious, long-term damage to your unit.

A few other nice-to-knows: in warmer climates, users can expect 7.5 GPM of water flow. I’ve heard owners complain about not achieving that GPM with higher-capacity heaters, so make sure you’ve thoroughly read the instruction manual to ensure your gas lines are set up properly, and you won’t have cause for concern. Another gem with this unit is the ultra low NOx emissions.

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Rinnai RL94eN Outdoor Natural Gas Tankless Water Heater

The Rinnai RL94eN comes in with a high price tag, but for natural gas users who need an outdoor unit, this sleek water heater confidently fits the bill. In a comparison of the best tankless water heaters, you will definitely want to keep the Rinnai Luxury line in mind. Outdoor water heaters eliminate the need for costly and time-consuming venting needs for indoor units. If you live in a climate that can support an outdoor unit, the RL94eN is a great option to consider.

If you want one of the highest GPMs of hot water for your home or commercial application, the Rinnai RL94eN offers an impressive 9.4 GPM. That translates into at least five different simultaneous demands for hot water; such as two showers, a dishwasher, washing machine, and a sink, all running at the same time.

The Rinnai RL94eN is Energy-Star certified with an EF of 0.82. It also has a patented re-circulation program that cycles water through at peak demand times (like the early morning hours) to provide the most efficient and best water temperatures for your family. For those with young children in the home, you can depend on Rinnai’s temperature lock to prevent scalding or burns from taps or showerheads.

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Rinnai V65EP Outdoor Tankless Propane Water Heater

The V65EP bring us to Rinnai’s Value series of tankless heaters. That means you’re getting down to the lower end of the price range, especially for propane users. It gives you a maximum of 150,000 BTU, and still offers a substantial 6.6 GPM of water flow. That should be ideal for warmer climates with a mid-size home.

Since this V65EP is manufactured for outdoor installation, you’ll save on the hassle of venting requirements. It’s more likely that this unit would do best in a warm or temperate climate. Another perk of the V65EP is that it complies with South Coast Air Quality Management District’s (SCAQMD) 14 ng/J or 20 ppm NOx emission levels. Low NOx emissions means a more fuel-efficient burner. The Rinnai V65EP is Energy-Star certified with an EF of 0.82.

As mentioned with the other Rinnai heaters, you will enjoy the patented re-circulation program that cycles water through at peak demand times (like the early morning hours) to provide the most efficient and best water temperatures for your family. For those with young children in the home, you can depend on the certainty of Rinnai’s temperature lock to prevent scalding or burns from taps or  showerheads.

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Conclusion

With this insight into the best tankless water heater for each scenario (cold weather, hot climate, size of home, and water demands), it’s important to still do your homework before purchasing and make sure that the unit you buy is the right fit for your needs. We don’t want you to be disappointed with a tankless water heater so take time to research your home’s needs to ensure the perfect choice. It’s also very important to make sure your gas lines are the right diameter for the unit you pick. Happy hunting!