Rinnai RL94eN Non-Condensing Natural Gas Tankless Water Heater, Outdoor Installation, Up to 9.8 GPM

(10 customer reviews)


Product details

Brand Rinnai
Capacity 9.4 Gallons
Power Source Gas Powered
Item Dimensions LxWxH 9.6 x 14 x 24.3 inches
Color Outdoor Installation
Voltage 120 Volts

  • Original Design: Tankless hot water heater’s Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE180eN model
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 9.8 GPM (6 fixtures at once)
  • Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region


Product Description

Rinnai’s high-efficiency non-condensing outdoor tankless natural gas water heater models offer advanced technology for your home with comfort and value. Designed to be extremely compact, this small water heater only takes up the space of a small suitcase, letting you reclaim some of your home’s most valuable real estate. This smart on-demand hot water heater can be made even smarter with a Rinnai Controlr for WiFi connectivity (not included). This easy-to-install, ultra-compact unit lets you enjoy all the benefits of Rinnai tankless water heating. You’ll experience clean, reliable hot water at a consistent pre-set temperature, while saving energy and precious floor space in your home.

From the Manufacturer

With a capacity up to 9.4 gallons per minute (GPM) of hot water, the R94LSe is capable of supplying continuous hot water to as many as five plumbing and appliance outlets simultaneously, ensuring you never run out of hot water. You’ll appreciate greater energy efficiency, lower energy costs and the simplicity of exterior installation.

From the manufacturer


tankless heater

constant hot water

lasts twice as long


Never run out of hot water again

With Rinnai, hot water is always available to you, no matter how much or how often you need it

Smarter, more durable than a tank

Rinnai tankless water heaters last up to twice as long, and save energy-heating water only when needed

The Rinnai difference

Individually tested for quality before shipping, Rinnai makes the vast majority of our key components, unlike our competitors, allowing for better, more consistent quality

energy efficient

recirculation technology

space saving design

Enjoy energy saving benefits

Rated by a Uniform Energy Factor (UEF), our tankless water heaters are highly energy efficient, saving you from expensive power and water costs

Recirculation benefits

Hot water is always ready. Our ThermaCirc360 technology can offer faster hot water through an external pump (sold separately)

Saves valuable space

Our suitcase-sized compact wall units fit neatly in, freeing up more usable areas in your home

Important information

Bulb Voltage

120 volts

Additional information

Weight 44.3 kg
Dimensions 9.6 × 14 × 24.3 cm



9.4 Gallons

Power Source


Item Dimensions LxWxH

9.6 x 14 x 24.3 inches


Outdoor Installation


120 Volts


Natural Gas Outdoor Installation

Part Number


Item Weight

44.3 Pounds

Product Dimensions

9.6 x 14 x 24.3 inches

Country of Origin


Item model number



9.8 GPM

Item Package Quantity


Water Consumption

9.4 Gallons




Outdoor use only

Included Components

Valve Kit

Batteries Included


Batteries Required


Warranty Description

See Manufacturer



Date First Available

July 12 2011



10 reviews for Rinnai RL94eN Non-Condensing Natural Gas Tankless Water Heater, Outdoor Installation, Up to 9.8 GPM

  1. Chris H

    Endless Hot WaterI installed this unit at my house a month after I moved in, over seven years ago. It’s been working great since then. Since the highest it’ll go on the residential controller is 120F, I find that we barely open the cold water tap for showers/handwashing, etc. I also don’t use the “warm” setting on the washing machine anymore: it’s either all hot or all cold. That being said, I’m perfectly satisfied and have no need for the commercial controller which allows temperatures up to 140F, although I considered it early on. It’s somewhat frustrating to lose hot water access when the power goes out, so with that in mind I bought a UPS for the water heater, similar to one you might use with a desktop PC. It allows the unit to keep the control circuitry running along with whatever other internal electronics are required to heat up water long enough to take a comfortable 10-15 minute shower even if the power is out. Though I love this unit, my next hot water heater will probably be a heat pump.

  2. Carlos P

    I rated this product 4 star only because I know that it can be better.Research the market before you buy.I rated this product 4 star only because I know that it can be better and more efficient than what it is today.With this initial assessment let me say that for its type it is the best tankless water heater I found in the USA, at least at the time I bought it.In the effort of helping others to understand if they can use a tankless water heater here are the points I researched and had to understand before buying this type water heater.1. Number of people and bathrooms as well as laundry room and kitchen or any other warm water faucet(s) in the house to be serviced at the same time.2. The minimum flow expected if you believe that you will have less flow than the minimum established for the tankless. Keep in mind that if you have water saver devices these can reduce dramatically the water flow. For example we have air mixing shower heads that reduce the water flow by at least 30%. According to the manual this model requires at least 0.4 Gallons of water per minute (GPM) to activate and 0.26 GPM of constant flow to keep it operating.3. The optimal pressure for maximum efficiency is key for this type of water heater. Rinnai recommends 30 to 80 for maximum efficiency.Some tips before you buy and install the tankless water heater.* Before you buy this unit have a professional plumber to check the pressure and flow (have at least two of the faucets to be used at the same time open half way for the flow test)of your house, it will be a worth while investment since you will find out if you can install this type of heater as is or maybe do adjustments to your water installation, this may add to your cost.* If you are replacing a traditional water heater (with tank), make sure that the cost of adapting the tankless does not add too much to the total you will spend* Compare prices of your local Rinnai Dealers against buying yourself the water heater from Amazon and all the needed parts and have some one else install it for you. By doing it this way I saved 50% compared to the most competitive Rinnai dealer quote. I was lucky to get a licensed plumber to do it for a fairly low price.Some negative commentaries and what I would respond to them:* It is very noisy: If properly installed it is actually less noisy than a traditional water heater. Plus it only makes noise when is in use.* I got to open a faucet to be able to get hot water: If this happens it means you may need to check the flow of the water at your house.* It takes a long time for the hot water to come out: How far is the heater from the faucet or shower head? What is the temperature setting? There are many factors that may contribute to this.My Experience living in southern Arizona and using this Rinnai water heater:* In winter is excellent, no draw back at all and I like to be able to set the temperature exactly where I want it I then put the hot water to the max setting and don’t worry if I get too much cold water in the mix.* In summer there is a small problem that is unavoidable, if you set the temperature to 98 F and the “cold” water coming in to the water heater is at 100 or 110 the water heater will not start since the water at the inlet is warmer than the setting. This has other consequences that can cause variability on the temperature of the water for several minutes. Things get normalized after all the warm water is out of the cold water line.* Hard Water: where I live we have very hard water, I got a water conditioner before the input of the water to the heater, I have not seen any need to clean or give any maintenance to the heater yet.Some Improvements that could make this water heater get 5 stars:* Need to be able to activate it at lower flow* Need to be able to use lower flow so water saving devices can be used without penalizing the heating capabilities of the heater* Improve the remote control so it is easier to install* Auto cleaning capabilities would be a plusSeptember 17, 2020 6+ years after buying.I promised that I would keep updates for this Rinnai Tankless water heater, and in reality, there is not much to add.Giving this water heater regular maintenance (around every six months or less) has kept it running like new after 6+ years of continuous use.If you are looking to buy a tankless water heater, I definitely recommend the Rinnai brand.

  3. Terry jurenka


  4. CJ

    Amazing product! Very happy with my purchase!I almost never write reviews, but felt compelled to write one for this purchase. I bought this product over a year ago, and wish I would’ve done it sooner! I went through two hot water tanks in 15 years and wasted so much money due to inefficiency. This heater is extremely reliable and have yet to have any problems with it. We can easily run two showers at once and have laundry and dishwasher running all at the same time. This heater can pump out a tremendous amount of hot water. The average shower requires 2.5 gallons a minute. If you do the math, 9.4 gallons is alot. It can take up to 20 or 30 secs in a large house to get hot water but that’s no different than a hot water tank. I installed the unit myself no problem. Venting the unit through the concrete foundation was the most challenging part of the install. It does require some plumbing skills but all in all wasn’t bad. I think placement of the unit is really important and should be as close as possible to your venting location. Ofcourse you also need to have your cold water feed, proper gas line, and a nearby outlet to power it. I mounted it on plywood which I tapconed to the concrete wall. For the water feed I recommend extending your water line with Pex, mainly because its easy to work with and its cheap. I know this unit is saving me alot of money in natural gas. My old tank was a zone off my hot water boiler which meant my boiler was running year around, even in the summer when it was warm out, just to keep hot water tank heated. Now my boiler only runs half the year and the on demand heater kicks only when hot water is needed and doesn’t waste gas when you’re not using it. Fantastic product! I removed the front cover to take a look under the hood, it looks well built with quality parts. This prompted me to put one in my 5th wheel camper. I can’t say anything about customer service because I haven’t had any reason to call them. I don’t think there’s much more to say except I highly recommend this product and is worth every penny!

  5. JustRidingAlong

    Retrofit old R85 model to 94RLiNI had an older model R85 natural gas model that had not been properly maintained by the previous owner. There was irreparable corrosion inside the unit with imminent leaking about to occur. The unit was 14 years old so I decided to upgrade to the 94RLiN. From a BTU standpoint they were identical but the new unit had a higher flow rate, an area we had noted as being a little on the weak side. Retrofitting was not as straightforward as I had anticipated. Overall it did take 3.5 hours working through some minor issues and ensuring a neat layout.Several things had to be done differently to install the new unit. First, the hanger brackets are dimensionally further apart by about 1/2″ on the new model. The previous installer did not leave any margin on the boards they installed the old unit against so new/wider boards were installed to accept the RL94iN hangar bracket dimensions.Secondly, the vent pipe connection on top of the Rinnai’s were different. The older R85 required the female portion to connect to the Rinnai. The new 94RLiN needs a male insert. This prompted me to purchase two new 90-deg elbows and a 10″ extension piece that needed cutting to size. Third, the older Rinnai did not have a condensate tube and one could tell this allowed moisture to collect in the unit. The new Rinnai has a condensate collection at the top of the Rinnai that one connects a drain tube to. If you are retrofitting you might as well install new vent pipes where it makes sense.If this design is as robust as the previous version, with some luck and proper maintenance this may run closer to 20 years.Installation was fairly straightforward. I do have to say that the old style bypass valves were easier to turn than the tiny ‘wrench required’ valves for when needs to clean the unit. I can see those becoming a pain at some point. Even though I have a water softener I went ahead and installed a scale removing filter on the cold water intake for additional unit protection.A big plus to me is the 94RLiN is substantially quieter than the older R85! It also seems to bring hot water to the faucet faster than the previous, probably due to the higher flow rate or more efficient heating of water. I don’t have any long-term use information to report as to whether it is as thrifty with nat gas as the old one, etc.

  6. cabinfever

    Love it.It has only been six weeks since I installed it myself. The owners manual is thorough and includes all of the necessary information for install if you are a handy person. If you aren’t comfortable with doing your own water and gas plumbing, cutting a hole through to the outside of your house, etc. I would suggest hiring a pro but check what they would charge you to install a product that you supply versus one that they supply. My local propane installer couldn’t touch this price even at his cost. As far as performance goes, I’ve had no problems with it running on well water. Our water hardness is well within spec (provided in the manual) so I didn’t install a water softener but I put a water filter ahead of the unit to keep sediment out of the heat exchanger. Its a low cost item for peace of mind. I won’t know if I really needed this large of a unit. (Family of four, two and a half bath house.) But just to test its capacity, I ran hot water in two showers and three sinks simultaneously and there was uninterrupted hot water at all five locations. My local propane company was going to suggest the 7.5? gallon version because it would save me two hundred dollars. His estimate, all parts and labor included came to 2500 dollars with the smaller Rinnai. As far as longevity goes, my brother installed one of the smallest Rinnai units 5.(3?) gallons about five years ago and he has had no problems with his. His first tankless water heater was a cheap tankless unit from a box store. He had lots of problems with it for two years before he ripped it out and bought his Rinnai. He said he should have paid more for the Rinnai in the first place. He uses a water softener though because his well water is very hard and loaded with minerals. He didn’t buy the Rinnai softener, I don’t know if I would use that after reading some of the reviews. My main reason for swapping out my electric water heater to this was to save money on my electric bill. Our electric rates are 14.6 cents per kilowatt hour. In my first full month of billing since the Rinnai, my electric bill dropped from 211 dollars to 126 dollars. And my propane cost for that time was 31 dollars. My propane is $2.50 per gallon. Since we swapped our electric range and clothes dryer over to propane, our electric bill dropped to 70 dollars last month. Like my wife said, we should have done this a long time ago. The best thing about this system is that we never run out of hot water. With one teenager and one preteen that take long hot showers, we can run the washing machine, dishwasher and sink while they are showering and everyone is happy. None happier than me though. Hopefully, there will be no need for warranty service. I have not been impressed with some of the reviews for Rinnai’s customer service. My propane guy says that Rinnai’s are bullet proof so time will tell.

  7. Paul J Seeds

    Overall very pleased. This unit is rated at 8I bought this unit to replace my R85i from Rinnai which had a cracked heat exchanger. Most places wanted around $600 for a new exchanger, so I opted to just buy a complete new heater. Mostly because with the old unit, the electronics had been exposed to water and even if I replaced the exchanger and it worked, for how long? You get the idea.This unit is ALMOST a direct drop in replacement for my older R85i, huge kudos to Rinnai for keeping the form factors nearly the same – this makes replacing an older unit that much easier, THANK YOU RINNAI. There are some differences though. The chimney diameter is different by about a millimeter… meaning you have to buy a new one. Slightly disappointing. The mounting holes lined up for the most part. The ending position of the water and gas lines was virtually the same. This saved me a lot of time as I didn’t have to do much to the plumbing. I did add a 3 core filter system though and had to re-plumb that. Also I used the steel braided lines going to the hot/cold as you aren’t supposed to run pex directly to an appliance. (I did not install the old unit).Overall very pleased. This unit is rated at 8.x GPM and my old unit was 9.x GPM. Can I tell the difference? No. This IS a condensing unit though, it is much higher efficiency than the old unit. The old unit was something like 80%, this one is something like 95% (don’t quote me, look it up). Because of this there is a condensing line you need to plumb. You HAVE to do this, do not just cap it and let the water pool, it will flow into the electronics of the box and ruin it.I’m told if you want to go higher that 120F you need to buy a separate controller. Honestly not an issue for me. I set it at 120F and forget it. My old unit was set at 115F. I can’t tell the difference. Really, I can’t think of a reason you would need/want 140F tap water anyway. YMMV. Here is a photo of my setup (incomplete) with my 3 core water filter. No, I did not install the gas line – some other boob did that. My understanding is that the flex gas line is only supposed to be used for the final 36″ to an appliance – apparently the previous installer got that backwards? I am going to re-do the gas line at some point…

  8. C. Thomas

    Hot. Consistent. Efficient. Quiet.I did a lot of research before buying this thing — who wouldn’t at that price-point — and so I had a lot of concerns when it arrived. Would it be too loud? Would it deliver warm enough water? Would it be as efficient as advertised? Would it arrive damaged?I needn’t have worried.The heater arrived in its retail packaging (Amazon does not add additional packaging and there’s no way to force them to do so with ad-ons or anything else; don’t try) entirely unharmed though, in fairness, I did spring for next-day delivery. I had the install done professionally so I can’t speak to that part, but once installed the water quality is great. It’s hot, there are no fluctuations in temperature, and the unit is whisper-quiet even when you’re standing right next to it.If you’re transitioning from a tank-based heater to a tank-less model you should be aware that it will take longer to get hot water to your appliance with one of these. Tank-less hot water heaters are built for efficiency; this one waits until about 0.5 gallons of water has flowed past it to turn on. This allows the heater to check the temperature of the incoming water and it also allows it to avoid turning on when someone hits the wrong tap or just wants a quick shot of hot water that’s already sitting in the pipe. If you have a 2-gallon per minute shower head that works out to about an extra 30 seconds of wait time for the hot water to start.Pressure can be a potential issue as well. Tanked hot water heaters have a pressure tank attached to them so they create their own pressure. That means that a drop in cold water pressure won’t make much of a different for hot water pressure in a tank-based set up. A tank-less unit uses the same cold water pressure for both hot and cold water. You can see what this will be like by turning your shower on full cold and turn turning on a few sinks full-cold as well. If your shower continues along at an acceptable pressure you’re not going to have any issues.Oh, and my gas bills are down and Rianni confirmed that it would honor the warranty on the unit despite my purchasing it through Amazon. Enjoy your endless hot water!

  9. Charles

    Rinnai is the only on-demand hot water heated to buyMy first one lasted for almost 20 years. Also, a lot less expensive to buy that an electric one. But don’t kid yourself, if you are not a plumber hire one to install it.

  10. Davis j

    So far so goodWe have 3 full bathrooms, 2 washing machines, kitchen sink, and a dishwasher. So far the rl94in has met all expectations we can shower all the kids and ourselves without worrying about running out of hot water. Only time will tell how long we get out of this unit ? As of right now extremely happy with the performance of this unit and the space it freed up in our laundry room..

Only logged in customers who have purchased this product may leave a review.