9.8 GPM High Efficiency Natural Gas Rinnai RUC98IN Indoor Tankless Water Heater

Considered the Cadillac of Tankless Water Heaters, the Rinnai RUC98IN 199,000 BTU Natural Gas Water heater delivers unparalleled performance. From the range of tankless water heaters we have reviewed at TopTenWater.com, this one certainly stands out for its efficiency and ability to deliver non-stop hot water for residential and even commercial applications. Rinnai brings with it almost a century of innovation and decades of experience in water heating. The company is geared to provide smarter appliances that continue to add value and meet the changing demands of consumers across the world.

Description

Considered the Cadillac of Tankless Water Heaters, the Rinnai RUC98IN 199,000 BTU Natural Gas Water heater delivers unparalleled performance. From the range of tankless water heaters we have reviewed at TopTenWater.com, this one certainly stands out for its efficiency and ability to deliver non-stop hot water for residential and even commercial applications. Rinnai brings with it almost a century of innovation and decades of experience in water heating. The company is geared to provide smarter appliances that continue to add value and meet the changing demands of consumers across the world.

The Rinnai RUC98IN condensing tankless water heater supplies a steady stream of hot water, along with providing recirculation thanks to its Circ-Logic Technology. To cater to more high-tech users, the appliance is Wi-Fi ready, allowing users to remotely monitor and control their tankless water heater with a smart device. This is a great feature that we’ve seen few tankless water heaters have. With a smart device, you can adjust the temperature or turn on recirculation for this appliance, which delivers 9.8 GPM.

The Rinnai RUC98IN provides stronger performance than several of its counterparts, allowing users to enjoy thermal efficiency of 95% through natural gas or propane. This unit is designed only for indoor installation and can be used effectively in a residential temperature range of 98F degrees to 140F degrees. For commercial use, the temperature range falls between 98F degrees and 185F degrees. Our review team at TopTenWater.com noticed that a commercial controller has to be purchased separately for commercial applications. But if you’re using the appliance at home, you should be good to go.

  •  This product requires professional installation, so consumers are requested to call 84-GO-Rinnai for help.
  • The Rinnai RUC98IN is ENERGY STAR Certified and has a 0.95 Energy Factor.
  • Thanks to Rinnai Circ-Logic technology, this tankless water heater can be paired with external pump in order to cut down waiting time for hot water delivery
GOODBAD
Meets and exceeds most residential application requirementsPriced higher than other tankless water heaters
Natural gas-poweredCommercial application requires purchase of additional accessories
Super high efficiencyCan only be installed by professional
Has multiple venting optionsWi-Fi needed to operate remotely

Features

  • Can be controlled through smart device
  • Provides hot water immediately
  • Energy factor up to 0.96
  • Uniform Energy Factor up to 0.92
  • 199,000 BTU maximum
  • Provides thermal efficiency of 95%
  • Operates on natural gas
Product Weight61.7 lbs.
Gas Connection6/4”
Vent Maximum Run492 in
Height26 in.
Ignition TypeElectronic
Maximum Flow Rate938 GPM
Minimum Flow Rate0.26 GPM
Max BTU Input199,000
Max Natural Gas Pressure10.5
Vent TypeDirect Vent
Max Gas Input199,000
Min Gas Input15,200

Few tankless water heaters have consistently positive reviews across the board, but with the Rinnai RUC98IN, the majority of users love the product. From the research we did on the product at TopTenWater.com, we found that while the appliance is priced higher than other brands in the niche, but people are happy with its performance. Users have praised the unit’s ability to provide hot water on demand. They’ve also said that the Rinnai RUC98IN is quieter compared to other units they’ve owned and more efficient. The few negative reviews we found online were mostly to do with improper installation. Let’s take a closer look at what customers are saying on various platforms.

The first comment our team at TopTenWater.com saw on Amazon was that this product is “worth every penny”. And that comment seems to resonate with most consumers who have purchased the Rinnai RUC98IN tankless water heater. Several purchasers loved the fact that this unit makes almost no noise, so it’s ideal for homes. Another pleasing aspect people on Amazon brought up is that Rinnai support is highly responsive. They’re available around the clock to help users out with whatever issues they may have with the device, from installation questions to queries about operating the appliance.

Most of the bad reviews our team saw on Amazon were related to the relatively high cost of installing this product. Several purchasers didn’t factor in installation costs, which can run up to a few thousand dollars with the Rinnai RUC98IN. Other users complained that this tankless water heater didn’t deliver 9.8 Gallons Per Minute, as promised by the company. However, they also admitted that the temperature of their incoming ground was considerably lower, which is why the unit may have difficulty providing the stated amount of hot water. Lastly, a few customers were unhappy that the product arrived damaged, which isn’t necessarily Rinnai’s fault.

Users loved the quiet operation of the Rinnai RUC98IN, along with the fact that the unit generates hot water faster than other water heaters they have previously owned. In addition, consumers saw a drop in their gas bill because they said the unit is more efficient than water heaters with tanks. One user was happy that the description of the product was highly accurate. Generally, most were happy about the water heater because it worked better than they expected.

One user complained that the device didn’t have constant temperature when other appliances such as the washer and dishwasher were being used. Also, they were unhappy that the temperature fluctuates when someone turns hot water on elsewhere in the house. Additional negative reviews comprised of consumers complaining of bad taste and smell in their water for up to one week after the installation of the Rinnai RUC98IN.

Purchasers on Build.com praised the 12-year warranty the Rinnai RUC98IN heat exchanger comes with. Another user regretted not buying this tankless water heater sooner, when their children were younger because it would have not just saved them a lot of money thanks to the product’s efficiency, but multiple people could’ve showered simultaneously without any issues. In addition, several consumers said that this Rinnai Tankless Water Heater is the best product they’ve purchased. The instructions are easy to follow, and the build quality is exceptional.

One user was unhappy at first because the speed of hot water delivery to the farthest faucet was slow, however, upon calling Rinnai Support, they were told to adjust the switch and their issue was resolved. Another consumer complained that there was no water being delivered by this water heater, and there were a lot of stones that came through their line, which eventually clogged up their faucets, shower heads and valves. However, this individual didn’t say whether they had the product installed professionally or did it themselves.

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