Brand | Rinnai |
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Product Dimensions | 18.5"W x 26"H |
Special Feature | MC-91-2US controller included |
Color | Steel |
Voltage | 120 Volts |
Maximum Flow Rate | 9.8 Gallons Per Minute |
Manufacturer | Rinnai |
Part Number | RUC98IN |
Item Weight | 82 pounds |
Item model number | RUC98iN |
Is Discontinued By Manufacturer | No |
Size | Twin Pipe/Ultra |
Item Package Quantity | 1 |
Water Consumption | 9.8 Gallons |
Certification | Energy Star |
Special Features | MC-91-2US controller included |
Usage | Indoor use only |
Included Components | water heater |
Batteries Included? | No |
Batteries Required? | No |
Warranty Description | Residential: Limited 12-year on heat exchanger, 5-year on parts, 1-year on labor (5-year optional on labor)<br>Commercial: Limited 5-year on heat exchanger, 5-year on parts, 1-year on labor (2-year optional on labor) |
Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater, Twin Pipe
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Brand | Rinnai |
Product Dimensions | 18.5"W x 26"H |
Special Feature | MC-91-2US controller included |
Color | Steel |
Voltage | 120 Volts |
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About this item
- 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
- The space-saving design allows Indoor Installation type
- Ultra low NOx emissions
- 199,000 max BTU
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This Item Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater, Twin Pipe | Recommendations | dummy | dummy | dummy | dummy | |
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Price | Currently unavailable. | $1,369.62$1,369.62 | $808.08$808.08 | $1,680.21$1,680.21 | $1,369.62$1,369.62 | $1,680.21$1,680.21 |
Delivery | — | Get it as soon as Tuesday, Mar 26 | Get it as soon as Monday, Mar 25 | Get it as soon as Sunday, Mar 24 | Get it as soon as Tuesday, Mar 26 | Get it as soon as Monday, Mar 25 |
Customer Ratings | ||||||
Easy to install | 4.3 | 4.6 | 4.6 | — | 3.3 | — |
Temperature Control | — | 5.0 | 5.0 | — | 5.0 | — |
Sold By | — | Amazon.com | Amazon.com | Amazon.com | Amazon.com | Amazon.com |
capacity | — | 9 gallons | 7 gallons | 11 gallons | 9 gallons | 11 gallons |
power source | Wind Powered | Battery Powered | ac dc | Battery Powered | Battery Powered | Battery Powered |
style | Indoor | Natural Gas, Indoor Installation | Indoor Installation | Propane, Indoor Installation | Propane, Indoor Installation | Propane, Outdoor Installation |
weight | 82 pounds | — | 62 pounds | — | 35.4 kilograms | 28.1 kilograms |
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Product guides and documents
Product information
Technical Details
Additional Information
ASIN | B00OBVKBB2 |
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Customer Reviews |
4.2 out of 5 stars |
Best Sellers Rank | #799,656 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #1,025 in Water Heaters |
Date First Available | October 9, 2014 |
Warranty & Support
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Product Description
Rinnai takes tankless water heating one step further with condensing technology that delivers more efficiency than ever before. Enjoy all the same tankless benefits you’ve come to expect from Rinnai, plus even greater energy savings. Features: 95% Thermal Efficiency Natural gas or propane Indoor Installation Only 98° F to 140° F Residential Temperature Range 98° F to 185° F Commercial Temperature Range Commercial Controller Must be Purchased Separately Gas Rate Input BTU's: 15,200 - 199,000 Electronic Ignition Meets California and Texas NOx Emissions Standards Compatible with Full Line of Rinnai Digital Controllers 12-Year Warranty on Heat Exchanger, 5 Year Parts, 1 Year Labor for Residential Installations Specifications: Width: 18.5" Height: 26" Depth: 10" Weight: 61.7 lbs Gas Connection: 3/4" Water Connection: 3/4"
Important information
120 volts
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the performance, ease of installation, value, and quality of the water heater. For example, they mention that it works well, provides constant hot water, and is easy to install. That said, some appreciate the energy efficiency, and speed. That being said, others are disappointed with the pump.
AI-generated from the text of customer reviews
Customers like the heat of the water heater. They say that it works flawlessly, the water temperature is constant, and it's able to keep up under load. Customers are also thrilled with the speed and availability of hot water. They mention that it provides long hot showers and that it' s a great heater.
"...Pros: Efficient, small, accurate temp control, "endless" hot water, informative manual, good customer service..." Read more
"...It caps out at 120 degrees F. Which is decently hot but for cleaning it's often helpful to have 130-140...." Read more
"...Overall I am satisfied with the system, enjoying endless hot water and some extra space in my mechanical room...." Read more
"Hot water almost instantly depending on how far the run is. Once the hot water gets there, it doesn't go away!..." Read more
Customers are satisfied with the performance of the water heater. They mention that it works well, has no issues, and is easy to install. Some customers also say that the basic installation works well.
"...After that, it ran perfectly every time. The unit is quiet and I couldn't be more pleased with its operation...." Read more
"...It has been working flawlessly and the water temperature is constant no matter if we use a lot or a little of water...." Read more
"...Here we are 1 year later and everything is wonderful!!!!!!!!! I'll update again at the end of 2020 or beginning of 2021!" Read more
"...Unit came on and worked flawlessly (well, almost).So my only complaint, I bought the Rinnai for 2 reasons...." Read more
Customers find the installation process of the water heater to be straightforward. They appreciate the clear documentation and the instructions provided with the product.
"...It was a ~$2K risk I was willing to take. The install was straight forward...." Read more
"...(seems to be most popular), 3) customer reviews, 4) clarity of documentation for install...." Read more
"...The packaging and instructions were also great, the included checklist made my wife feel comfortable as I asked her to walk through them with me so..." Read more
"...The unit appears to work as described and the installation of it specifically went very easily indeed...." Read more
Customers like the value of the water heater. They say it's worth every penny and a great buy.
"Installation was easy. Price was great. Got a $300 rebate from the gas company. All the hot water I’ll ever need. Long hot showers!!..." Read more
"State of the art tankless water heater at an excellent price...." Read more
"Worth every penny." Read more
"...I also did get the condensate neutralizer kit. Seems overpriced, but I didn't want to risk damage to any drainage pipe/septic tank...." Read more
Customers are satisfied with the quality of the water heater. They mention that it's a great product, with excellent documentation. They also appreciate the endless hot showers for all.
"Awesome Quality and excellent documentation made my self installation an adventure. Would I do this again by myself? Not in a million years!..." Read more
"Great product. Produces hot water for kitchen and three bath rooms...." Read more
"These are awesome - endless hot showers for all!!!" Read more
"Great product. Love it!" Read more
Customers are impressed with the water heater's energy efficiency. They mention it's quiet, good for natural gas savings, and provides endless hot water.
"...Pros: Efficient, small, accurate temp control, "endless" hot water, informative manual, good customer service..." Read more
"...Why, because they are more efficient and last longer when maintained correctly.Extremely happy with it." Read more
"...go to tankless water heaters....just makes sense and saves money on electric bill....love it!" Read more
"Good for natural gas saving but the other side you have to wait lot to get hot water after opening tap so basically wasting lots of water other side." Read more
Customers are satisfied with the speed of the water heater. They mention that it provides hot water quickly, has a low flow rate to trigger, and works well. Some say that the installation process was easy.
"...It had the lowest flow rate to trigger. All the other stats were pretty similar between brands (Noritz and Takagi)...." Read more
"...Once we hooked up the good one we were thrilled with the speed and availability of hot hot water - we actually turned the unit down to 125..." Read more
"The installation was straightforward and so far the performance has been excellent. It's exactly what we were looking for...." Read more
"Works well, provides hot water quickly. Relatively easy install...." Read more
Customers are dissatisfied with the water heater's pump. They mention that it wastes water, runs the water for a long time, and does not run continuously. They also say that the unit will become less efficient after three years and clog up with sediments. Customers also say the pump does not fill 1 bathtub with hot water.
"...Otherwise this unit will start to become less efficient after 3 years and will clog up with sediments after 7 years...." Read more
"...Since the pump doesn't run continuously, the water temperature does fluctuate a bit at first; it would be nice if the unit had a small holding tank..." Read more
"...Again if starting temp is 100 degrees. This will not fill 1 bathtub with hot water! Will be replacing it tomorrow with a standard water heater" Read more
"...also slow to heat water making you run the water a long time, wasting alot of water. I called the company and was told that is the way it is SORRY!" Read more
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Top reviews from the United States
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Pros: Efficient, small, accurate temp control, "endless" hot water, informative manual, good customer service
Cons: Small increase in time it takes to heat water, very slight dip in water pressure
2 YEAR UPDATE:
Overall, I've been extremely pleased. I have had zero issues with this water heater. Some notes:
- This thing absolutely sips natural gas. To put it in perspective, only two devices use gas in our home - The water heater and a ~25 year old furnace (yeah, it's on its way out). During the winter our gas bill can be upwards of $90 for cold months. In the summer, when the only device using any gas is the heater, our bill is as low as $12 and that's with an $8 flat fee. Every home and family is different - we only have two adults and no dishwasher. But, I'm very satisfied and believe this thing will pay for itself.
- I flush the water heater twice per year. This seems to work well. Personally, I wouldn't want to do it less frequently. We have well water and it's pretty hard. Once per year I will open it up and inspect the internals.
- Speaking of a well... This is important information if you have one, too. If you're familiar with how a well works, the well pump kicks on when the pressure dips below a certain threshold and pumps water into the system until the pressure rises to another threshold, then stops. The heater must adjust the burners as the pressure increases to keep the outlet pressure at a steady temperature. The heater tries hard to do this, but isn't perfect. We have a shower probably 6 feet of pipe away from the outlet. In this shower, you can hear the well pump turn on and the pressure increases. The heater keeps up, but actually overshoots some. It's not scalding hot, but it's noticeable. So, it gets hotter for no apparent reason if you're not expecting it. This is ONLY true for appliances/sinks/showers RIGHT next to the heater. We have another shower directly above (10-14ft of pipe?) and the temp change is non-existent. The temperature dissipates by the time it gets there. I don't mind this, I actually kind of like it, but I completely understand if someone would be bothered by this.
Reviewed in the United States on February 15, 2017
Pros: Efficient, small, accurate temp control, "endless" hot water, informative manual, good customer service
Cons: Small increase in time it takes to heat water, very slight dip in water pressure
2 YEAR UPDATE:
Overall, I've been extremely pleased. I have had zero issues with this water heater. Some notes:
- This thing absolutely sips natural gas. To put it in perspective, only two devices use gas in our home - The water heater and a ~25 year old furnace (yeah, it's on its way out). During the winter our gas bill can be upwards of $90 for cold months. In the summer, when the only device using any gas is the heater, our bill is as low as $12 and that's with an $8 flat fee. Every home and family is different - we only have two adults and no dishwasher. But, I'm very satisfied and believe this thing will pay for itself.
- I flush the water heater twice per year. This seems to work well. Personally, I wouldn't want to do it less frequently. We have well water and it's pretty hard. Once per year I will open it up and inspect the internals.
- Speaking of a well... This is important information if you have one, too. If you're familiar with how a well works, the well pump kicks on when the pressure dips below a certain threshold and pumps water into the system until the pressure rises to another threshold, then stops. The heater must adjust the burners as the pressure increases to keep the outlet pressure at a steady temperature. The heater tries hard to do this, but isn't perfect. We have a shower probably 6 feet of pipe away from the outlet. In this shower, you can hear the well pump turn on and the pressure increases. The heater keeps up, but actually overshoots some. It's not scalding hot, but it's noticeable. So, it gets hotter for no apparent reason if you're not expecting it. This is ONLY true for appliances/sinks/showers RIGHT next to the heater. We have another shower directly above (10-14ft of pipe?) and the temp change is non-existent. The temperature dissipates by the time it gets there. I don't mind this, I actually kind of like it, but I completely understand if someone would be bothered by this.
When I moved into my new home, I didn't realize how old it's water heater was. It was so old and filled with sediment I has maybe 15mins of hot water. So I decided to upgrade to something where I could use as much hot water as my wallet would allow! So I shopped around extensively. The local shops in my area had stupidly limited selections and high prices. So I took my search online. Amazon offers TON of tankless heaters at pretty good prices. After tons of review searching, making sure to filter out fake reviews, this unit really stood out as wildly successful for other. Plus it came in way under my 2k price limit. So I pulled the trigger and got it.
Had it installed a couple weeks after I got it along with a water softener and I am so pleased.
This unit is able to keep up with multiple appliances running at once. I did a load test with my washer, shower and dish washer running at the same time. All had decently hot water, but slightly diminished. I was getting maybe 110 degree water, which is reasonable. My house only has one bathroom so my load test was the worst case scenario. If you live in a house with multiple bathrooms tho, I don't think this is for you. You'd water something beefier. For me, this works great
My only gripe with this is I wish the unit would allow for higher heat. It caps out at 120 degrees F. Which is decently hot but for cleaning it's often helpful to have 130-140. You can hack it to go that high and many people report it being just fine, but that does me no more warranty.
I highly suggest using a water softener in conjunction with this unit if you live in a house with hard water. For me I live in Update NY and get treated lake water which is quite hard. Otherwise this unit will start to become less efficient after 3 years and will clog up with sediments after 7 years. Then you'll have to have it flushed with acid.
Something else to be aware of:
You may know this already if you are re-searching tankless heaters but it does take some time for it 'catchup' once you turned the hot water on. And how long it takes depends on the flow rate and distance from the heater. I had my heater located closest to my bathroom. My tub takes ~ 4 secs for hot water. My kitchen sink is the furthest from the heater and has a pretty slow flow rate. It takes ~ 32 secs to get hot water.
I had this installed in March and haven't had a single issue with it. Running like clockwork.
My energy bill dropped in half after installing this. Which makes sense. I live alone and work 10-11 hours every day and shower once a day. When I get home I use cold water to cook or wash my hands. So really on an avg day I am only using hot water in the morning for a shower. That's a whole lot of energy waste for a tank based water heater. Plus I get a $200 rebate which is nice.