As a homeowner, it is absolutely essential to equip your home with an excellent hot water heater. Failing to do so will leave you in a precarious situation and you’ll likely be forced to take cold showers on a regular basis. As technology has evolved and improved, water heaters have followed in suit. As long as you obtain the right water heater, you’ll be able to avoid cold showers. This is where Rinnai will enter the picture. This Japanese company specializes in water heating appliances. The company is widely considered one of the most reliable and reputable in the business. Below, you’ll learn all about Rinnai and the benefits of their products.

Company History

First and foremost, you should familiarize yourself with Rinnai and the company’s history. The company was originally founded in 1920 by Kanekichi Hayashi and Hidejiro Naito. In the beginning, the company manufactured pressurized oil cooking stoves. In just 10 years, Rinnai had expanded immensely and begun developing gas appliances, such as gas cooking stoves, space heaters and ranges. It wasn’t until 1964 that Rinnai began to develop efficient water heating appliances. Today, the brand is recognized all around the world and is praised by consumers and critics alike.

According to the company, over thirty million Rinnai tankless water heaters have been purchased and installed by consumers from all around the world. The brand’s North American operation was established in 1974. Today, the company consists of twenty branches and six production facilities. They also have over eight-five sales offices in various countries, including Thailand, the United Kingdom, United States, Vietnam, Australia, and even China.

Built For Efficiency

Rinnai has truly manufactured an abundance of different water heater models. While there are many differentials between the different models, there are also many similarities with one of the most notable being energy efficiency. The mass majority of water heaters from Rinnai are designed with energy efficiency in mind. These tankless water heaters are manufactured with copper heat exchangers. This minute feature plays an enormous role in helping improve the efficiency of the unit. According to the manufacturer, it is possible to use around forty percent less energy with a Rinnai tankless water heater, when compared to the traditional models.

At the same time, these water heaters are designed to save the consumer money. Since the appliance is only used when it is needed, the homeowner will save on their energy bills and utility costs. These are ultimately two of the biggest benefits associated with Rinnai and their water heater.

Less Costly Longevity

Consumers should also understand how costly it can be to replace a traditional water heater. The older models have very complicated wiring and innumerable components. This makes it nearly impossible to fix and older water heater by replacing a single part or two. Instead, the consumer will be required to purchase a new replacement. This isn’t a problem with Rinnai tankless water heaters. Each and every component found in a Rinnai water heater is completely replaceable. Each component can be replaced easily and cost effectively.

This makes it possible to extend the longevity and lifespan of the water heater, without needing to spend excessively. In most cases, a tankless water heater from Rinnai will greatly outlast the offerings from the company’s competitors.

Surprisingly Sustainable

Global warming and climate change have become incredibly important topics in the past few years. It is downright imperative for consumers, especially homeowners, to do everything humanely possible to live a green life. Failing to do so could very well negatively impact the future of subsequent generations. This is why many consumers will decide to switch to a Rinnai tankless water heater. These water heaters offer numerous benefits in terms of sustainability. They perform with maximum energy efficiency, which helps to converse nature’s precious resources.

Also, these units produce much less waste than their competitors. Since they’re more compact, the parts are recyclable, and the water heaters last longer, less waste will be transported to the landfill when the unit’s lifespan has concluded. And finally, it is important to remember that Rinnai water heaters emit fewer CO2 emissions than their older competitors. With a water heater from Rinnai, the consumer is truly doing their part to maintain the environment.

Compact Size And Easy Installation

Finally, you should know that water heaters from Rinnai tend to be very lightweight and compact. In fact, the majority are very similar to the size of a small suitcase. And, each unit can be installed on a wall. The compact size helps to make installation substantially easier, while also increasing your installation options. These products can realistically be installed in attics and even in crawlspaces. The possibilities are endless and you’ll always find it easier to install one of these products compared to one of the older tanked heaters.


1. Rinnai RL94iP Propane Tankless Water Heater

Rinnai RL94iP Propane Tankless Water Heater

Deciding whether or not to switch from the conventional water heater to the tankless water heater requires a lot of thought. One of the most crucial decisions you will need to make is the brand name and model. It is obvious that there are innumerable brands on the market, but none of them compare to the Rinnai. This brand is known for producing products that are guaranteed to endure the test of time. The RL94iP model can do just that, plus a whole lot more.

BTU Rating

The Rinnai RL94iP is capable of producing from 10,300 up to 199,000 of BTU power, offering a temperature setting of 98 to 140 degrees Fahrenheit. The great benefit of this model is it can be utilized in residential and commercial settings. The unit comes with a MC-91-1US Digital Controller and the option to purchase a commercial controller. The commercial temperature settings are from 98 to 185 degrees Fahrenheit, which is 40 degrees higher than the residential settings.

Estimated Yearly Cost

To operate the RL94iP year around, will cost on average of $374, based on the 2007 cost of $1.87 gallon for propane. This is an energy efficient unit, which is a necessity in today’s world, with the ever-increasing utility costs. With no pilot light to deal with, there is no standing heat loss, cutting energy waste drastically. If your unit is outdated and you plan on replacing it with this model, you should expect to see a significant drop in propane usage. Since the unit is capable of modifying and controlling the burner, allowing for a reduction in fuel consumption.

Concentric Venting System

Unlike the conventional tankless propane water heater, the RL94iP utilizes a concentric venting system. The vent is very unique in that it can carry both fresh air and exhaust fumes, ensuring high air quality. This design does not use the indoor air to cool down or burn the exhaust gas, making it even more energy efficient. Contemporary units will utilize indoor air, creating massive air waste. Since this is a closed system, it will not allow cold or warm air into the exhaust vent, when the unit is not in operation. The concentric venting system is top-of-the-line, eliminating exhaust fumes and odors.


  • Concentric venting system – 83 percent
  • Energy efficient rating
  • Includes a 12-year manufacturer’s warranty on heat exchanger
  • Capable of producing up to 9.4 gallons of hot water every minute
  • Compact and lightweight (50 pounds) design
  • Constructed out of heavy-duty metal, with a chrome finish
  • Includes a MC-91-1US digital controller
  • BTU rating – 10,300 – 199,000


  • Requires a professional install by a licensed plumber
  • Hot water is delayed by 40 seconds

Overall Assessment

The Rinnai RL94iP Propane Tankless Water Heater is one of the best on the market. The unit is energy efficient, with adjustable temperature settings and operates in a cost-efficient manner. The extensive warranties make the price tag a little friendlier, plus this particular unit is guaranteed to offer a lifespan of 30 years of longer.

 2. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

The Rinnai RUC98iN Tankless water heater is capable of producing up to 199,000 BTU power. The unit is energy efficient, with a .96 energy factor, so if you are replacing a traditional water heater, you should expect to see a reduction in your energy bill. The compact, lightweight design makes the unit perfect for small closets or cubbyholes. Just mount onto a wall, increasing the floor space, so you can easily store items underneath the unit.

Low Mono-Nitrogen Oxides

A major benefit of the Rinnai RUC98iN is it produces a very low amount of mono-nitrogen oxides (NOx). This actually makes the unit very eco-friendly, which is extremely important in today’s world. The unit is still capable of producing continuous hot water with temperatures ranging from 98 to 140 degrees Fahrenheit for residential settings. You can also utilize this particular model in commercial settings, as well. Commercial setting placement requires a separate Commercial Temperature Range Controller.


  • Suitable for commercial and residential settings
  • Compact and lightweight (61.7 pounds) design
  • Wall mountable installation
  • BTU rating – 15,200 to 199,000
  • Includes a 12-year manufacturer’s warranty on heat exchanger


  • A little pricey

Overall Assessment

Truly, the Rinnai RUC98iN Water Heater is one of the most powerful products from Rinnai. In fact, it might be a little too much for some consumers. The unit can produce a maximum of 199,000 BTUs and it maintains a top Energy Factor rating of .96. The water heater and all of its components are protected by extensive warranties. Therefore, it is truly well worth the cost.

3. Rinnai V65EP 6.6 GPM Outdoor Tankless Water Heater

Rinnai V series front side

It is no secret that Rinnai has manufactured a large quantity of excellent water heaters. Nonetheless, a few of their products tend to stand out amongst the rest. The V65EP 6.6 GPM Outdoor Tankless Water Heater most certainly does just that. This specific product is very compact and is designed for use almost anywhere. In fact, it is even certified for utilization in mobile homes. And, the unit meets all guidelines put forth by Orange County’s South Coast Air Quality Management District. Therefore, it can be installed and utilized anywhere and in any home.

Temperature Options

It is undeniable that each consumer will be interested in a specific water temperature. Some prefer slightly hotter water than others. The Rinnai V65EP 6.6 GPM Water Heater will be able to accommodate everyone. This unit offers a water temperature range of 98 to 140 degrees Fahrenheit. For safety purposes, the model comes pre-set at 120 degrees Fahrenheit. The temperature can be adjusted by the installer. Regardless, you can rest assured knowing you’ll be able to select a temperature that suits your precise needs.


The Rinnai V65EP Water Heater is immensely versatile. As mentioned above, it offers an array of temperature options and the flexibility doesn’t stop there. The unit is compatible with propane and natural gas. Regardless of the energy type you select, the unit will always maintain an energy factor rating of .82. Also, this product is compatible with the full lineup of digital controllers from Rinnai. Ultimately, most people will be able to install and use this water heater without needing to make any additional purchases.


  • Heater exchanger is protected by a 10-year warranty
  • Includes a 5-year warranty on parts and 1-year warranty on labor
  • Offers temperatures ranging from 98 to 140 degrees Fahrenheit
  • Compatible with propane and natural gas
  • Certified for use in mobile homes
  • Maintains an Energy Factor of .82 regardless of gas type
  • Equipped with a handy error code indicator
  • Works with the full line of digital controls from Rinnai


  • Water pressure can drop unexpectedly

Overall Assessment

All in all, the Rinnai V65EP is undeniably a great hot water heater. In fact, it could be one of the best offerings from the company. It is fairly lightweight and very compact. It can produce up to 150,000 BTUs maximum and comes with an extensive warranty. Since the unit is so energy efficient, versatile and easy to install, it could be a great investment for all consumers. Whether you live in a big house or a mobile home, you can guarantee the Rinnai V65EP Water Heater will suit your need.