Rinnai R94LSi review

Image from Amazon

A good high-end indoor tankless water heater, worth considering from Rinnai is the R94LSi. It is considered as the big brother to the smaller model Rinnai R75LSi; it has a higher production capacity of 9.4 GPM. It is available in two makes; one that runs on natural gas or propane.

So in view of my focus on green products and since heated water takes up a rather large chunk in utility bills. I have decided to research and provide information for consumers in my Rinnai R94LSi review.

The Rinnai R94LSi might be not so readily available in local shops so shopping online is still the best way. Generally a good place to start will be Amazon who is the largest online retailer of products.

Benefits Of Owning A Rinnai R94LSi

Production capacity of 9.4 GPM

It has a production capacity of 9.4 gallons per minute (GPM) of hot water. According to  consumers, a single unit of R94LSi is able to service up to 3.5 bathrooms, laundry and kitchen concurrently with no fear of hot water running out.

Compact and sleek design

The Rinnai R94LSi can be installed easily indoors only in any room for your home or office buildings. The Rinnal R94LSi can also be installed in mobile homes. This unit has a weight of 56 pounds.

This Rinnai tankless water heater also allows you to save on space, without the presence of a storage tank, and energy since there is no need for the continuous heating of water, in a traditional tank water heater setup.

Digitally controlled temperature design

Adjusting and troubleshooting of this Rinnai tankless water heater is also controlled digitally via the standard MC-91-1US controller and ranges from 98 Degrees Fahrenheit to 120 Degrees Fahrenheit.

Like all LS models of Rinnai tankless water heater, it comes with a commercial heat exchanger that allows for installation indoors for residential, commercial and even for mobile homes. The consumer can also upgrade the controller can also be upgraded to MCC-91 for commercial purposes that will increase the maximum temperature to 185 Degrees Fahrenheit.

Runs on Natural Gas or Propane

As compared to oil and coal, natural gas is the cleanest fossil fuel in terms of emission, with the least emissions in terms of sulphur dioxide and nitrogen oxides, with virtually no ash or particulate matter released. Propane has also been slated together with natural gas to be a potential alternative and cleaner energy source.

Besides that, lower levels of carbon dioxide, carbon monoxide, and other reactive hydrocarbons are also released as compared to oil and coal. The maximum / minimum natural gas rate required for the Rinnai R94LSi is 199,000 / 15,000 Input BTU/h while for propane is 190,000 / 10,300 Input BTU/h.

Green Product

Rinnai R94LSi is an Energy-Star certified product with a thermal efficiency of 84% and energy factor of 0.82. It also meets California and Texas NOx emissions standards. In fact, installation of all Rinnai tankless water heaters, with the exception of Rinnai R98LS, will qualify you for a 300 USD federal tax credit for being an energy efficient product.

The Rinnai R94LSi, like all Rinnai products, also last much longer than those traditional tank water heaters; up to 20 years more. The primary components that make up all Rinnai tankless water heaters like the digital panel and heat exchanger are also all recyclable.

Summary of Specifcations for R94LSi

Dimensions Height = 22.9 in.
Width = 14 in.
Depth = 9.6 in.
Weight = 53 pounds
Hot Water Capacity 0.26 to 9.4 GPM
Minimum Activation Rate 0.4 GPM
Minimum/Maximum Gas Rate (Input BTU/h)9,900 – 199,000 (Natural Gas)
10,300 – 190,000 (Propane)
Ignition Direct Electronic
Temperature Settings98°F - 120°F (factory default)
98° F - 185° F with MCC-91-2US
Type of Controller MC-91-2US (included)
MCC-91-2US (optional for Commercial or Hydronic Applications)
MC-100V-1US Deluxe Controller (optional)
BC-100V-1US Bathroom Controller (optional)
ElectricalAC 120 Volts, 60 Hz
Electrical Consumption Normal: 83 Watts
Standby: 2 Watts
Anti-Frost Protection: 184 Watts
Service Connections Gas Supply: 3/4 Inch MNPT
Cold Water Inlet: 3/4 Inch MNPT
Hot Water Outlet: 3/4 Inch MNPT
Venting Direct Venting
Energy Star Certified Yes
Energy Factor 0.82 for Natural gas or Propane
Approved Gas TypesNatural Gas or Propane

Here is a video of the Rinnai R94LSi in action !

How does Rinnai R94LSi rank on popular websites?


25 reviewers at Amazon gave Rinnai R94LSi an average of 4.2/5 stars. Comments were mostly positive with 14 reviwers giving it a maximum of 5/5 stars.  


A survey carried out in 2007 by BuilderOnline.org showed that Rinnai tankless heater was ranked first in terms of quality ahead of popular brands like Rheem and A.O Smith.  

 (Download results of the survey here)


Okaloosa Gas District

Practical tests were also carried out by Okaloosa Gas District in 2002, comparing tankless water heaters by Rinnai with a natural-gas, storage-tank water heater and an electric water heater, based on the average use of a four-person household. Results of the tests showed that the Rinnai tankless water heater is superior to both storage-tank models in terms of both fuel costs and also the amount of hot water delivered.

Customer Reviews for Rinnai R94LSi

I have read many recent customer reviews for Rinnai R94LSi and have summarised them below.

The Pros 🙂

The pros of this unit are many and includes its space saving design, quiet engineering design and its almost instant hot water. Another advantage is the visible cost savings on your utility bills upon installation of the R94LSi. Prior to purchasing this unit, you must size it to suit your needs! Rinnai R94LSi is perfect for producing high volume of hot water for running a tub or a few family members having a hot shower concurrently.

However if you going to use hot water for just washing of dishes or the bidet; that do not require a continuous volume of hot water. It is not suitable for such usage though another good tankless water heater series worth considering is the Eccotemp L series.

The Cons 🙁

Some cons mentioned by consumers include the price of the unit, possibly brief spurts of cold water, the waste of water caused by the delay between turning on the faucet and getting hot water. Some of this mentioned effects might be a result of improper installation, so it will be good if your installer has prior experience in installing a tankless water heater or is a Rinnai certified installer.

The location where you are going to install the Rinnai R94LSi  has to have a suitable gas supply line that has the capacity to supply the unit so not every location will be suitable. The inherent temperature for your region should also be considered. The maximum temperature for R94LSi might not be hot enough if the water temperature is too cold. The R94LSi has been mentioned by consumers to be susceptible to freezing damages so it will not be suitable for areas with very cold winters.


There is a limited warranty that comes with the Rinnai R94LSi. The heat exchanger is covered for 12 years for residential usage only, 10 years for residential and space heating, and 5 years for commercial settings. There is a 5 year warranty for the other parts and 1 year labour warranty coverage.

Best Deals for Rinnai R94LSi

As I have mentioned that the best place to buy a Rinnai R94LSi is at Amazon or her affiliate sites. At lower prices compared to other places, getting it at Amazon is certainly a good and viable option.

So if you are interested, here is the link under Amazon: R94LSi Best Deals.

The Rinnai R94LSi is currently out of production as reported on Amazon, there is a newer model of this water heater that is the RL94iN. If you are interested, here is my unbiased review: Rinnal R94LSi Review

 (Download Rinnai R94LSi Specifications Sheet here)



Last updated 21st February 2012

Wilson Yeo

I am the admin of Green Energy Helps and I possess a keen interest in how green energy and how leading a green lifestyle can help to reduce our individual carbon footprints. From my website, I will provide useful information about green energy and tips that allow you to leave the green way. Besides that, I will provide unbiased reviews about green products and whether they are suitable for you!

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