|Item Weight||82 pounds|
|Product Dimensions||10 x 18.5 x 26 inches|
|Item model number||RUC98iN|
|Is Discontinued By Manufacturer||No|
|Item Package Quantity||1|
|Flow Rate||9.8 Gallons Per Minute|
|Water Consumption||9.8 Gallons|
|Special Features||MC-91-2US controller included|
|Usage||Indoor use only|
|Included Components||Water heater|
|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
- Make sure this fits by entering your model number.
- 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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|Sold By||Available from these sellers||Amazon.com||eFaucets||Buildcom||Amazon.com|
|Item Dimensions||10.00 x 18.50 x 26.00 inches||18.50 x 11.45 x 31.30 inches||22.05 x 14.76 x 33.86 inches||14.04 x 9.27 x 26.90 inches||9.27 x 14.04 x 26.90 inches|
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"
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.
I was replacing a 40 gallon conventional water heater and needed a continuous hot water supply for a newly installed Jacuzzi bathtub (55-75 gallon capacity). I looked at 50-60 gallon tank heater but felt like I would have no guarantee they would provide the supply required for the Jacuzzi tub. I also like the idea of saving energy with "on demand" heating.
I could not get behind paying someone $2000+ to do the install so I studied documentation, youtube videos and decided to do the installation myself. The install took about 24 hours of effort by myself. If I did it again it would probably take me 12-16 hours. There was a bunch of copper pipe sweating and gas line work but the biggest challenge was the venting. I had to go 25 feet horizontally and terminate with a snorkel style vent to clear the potential snow line. Had to purchase a rotary hammer to get through the brick wall for the vent pipes. I had to move an internal heating duct to provide a channel in the sub-floor (accessed fro the basement). The challenges in the venting are site specific and are the main reason I believe installers charge so much. There also seems to be a relationship between the install cost and the appliance cost which may be unfounded.
Once installed, it failed to start for several times until the air in the gas pipes was cleared. After that, it ran perfectly every time. The unit is quiet and I couldn't be more pleased with its operation.
One of my concerns of going tankless was how much additional delay was I going to experience waiting for hot water. With a conventional tank heater, the delay is basically how long it takes to purge the water between the appliance and the heater. This will be based on how much water is in the pipe ( pipe length x 3.14 x pipe diameter / 2 ) and the water flow of the appliance. For 3/4" pipe, this is about one gallon per 40 feet. A faucet running 1.0 gpm will take about a minute to get hot water. A high flow tub faucet at 5 gpm will take only 12 seconds.
With the tankless heater there is unspecified additional delay between turning on the water and having hot water leaving the heater (no one seems to want to talk about it or include it in their specs). The heater takes a second to detect the water flow, a second to turn on and detect the igniter, a second to turn on the gas and ??? to then produce hot water at the heater output. Unfortunately, I did not measure the pipe delay with the old water heater but I estimate that I have added 10-15 seconds delay with the tankless heater. I do believe this concern makes people more aware of the delays which translates into more complaints than are warranted. Manufacturers BTW, have gone to great lengths to address this (e.g internal re-circulation pumps).
From a hot water standpoint, I now have unlimited hot water. By hot, I mean < 120 degrees. The maximum setting on the heater is 120 degrees. This does prevent me from quickly adding scalding water to the bathtub to reheat it up quickly. Also, I live where the ground temperature keeps water at 50 degrees or so which limits the gpm of the system to 5-6 gpm. So far this does not seem to be a big limitation. At worst, it may limit how quickly I can fill the tub but it doesn't prevent operating multiple showers.
Overall I am satisfied with the system, enjoying endless hot water and some extra space in my mechanical room. I am satisfied with the tradeoffs between tank and tankless and will probably never own a tank water heater again. BTW, I was under time pressure to get this done as my old water heater had failed and was pretty happy to purchase this online and have it delivered in a couple days.
We switched from electric to gas and our power bill went down significantly but we only pay a little bit more for gas per month. The unit will pay for itself in a couple of years.
This unit can be configured with a recirculation system for instant hot water.
At first I added a small pump but it was too small so the unit would not fire consistently. I replaced the small pump with the Rinnai GTK15 kit which comes with a large pump and a timer and now it turns on every time.
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 to compensate for this. Maybe the RUR98iN which includes the circulator works better for this application (but it's significantly more expensive)
Update July 2017
We've had the unit for 2 years and I updated my review from 4 to 5 stars. It has been working flawlessly and the water temperature is constant no matter if we use a lot or a little of water.
Update April 2018
Still working as well as the day it was installed. Zero headaches :-)
Top reviews from other countries
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