[Updated] The 6 Best Rinnai Tankless Water Heater Reviews in 2020


Rinnai Tankless Water Heater Reviews

Established in 1920, Rinnai Company was originally a seller and manufacturer of cooking stoves which use pressurized oil. The Rinnai Company was founded by Hidejiro Naito and Kanekichi Hayashi who decided to venture in gas appliances back in the 1930s. It wasn’t until 1964 that this company started designing water heaters. It’s North American operations started in 1974.

Today, Rinnai has more than 30 million tankless water heaters which have been installed all around the world. If that’s not all, Rinnai tankless water heater’s feedback shows clearly that the brand has come to be synonymous with innovation and quality.

Why Should You Choose RINNAI Tankless Water Heater?

whyIn case you’re shopping for tankless water heaters, then there’s no doubt that Rinnai is a well-known and established a brand that you’ll come across.

Following the principles of the tankless water heaters, their heaters provide unlimited supplies of hot water anywhere and anytime within the household. With Rinnai tankless water heaters, the family members can always shower, wash loads of laundry or even do the dishes without ever worrying about the hot water running out.

Unlike the traditional tank heaters which constantly heat and store water, the Rinnai tankless heaters only heat water when it is required. As a result, a reduced amount of energy is consumed which translates to low energy bills. For instance, the Rinnai RLN4i water heater has an estimated annual energy cost of 201 dollars. This is dramatically lower than the 585 dollars that you would expect to spend on the traditional 40-gallon electric water heater.

The traditional tank versions are mostly massive in size and they usually take up considerable floor and wall space when installed. This could be a problem in case you have limited space at home. Approximately the size of the carry-on suitcase, the Rinnai tankless heater can fit conveniently in spaces which a regular heater can’t fit into – like narrow corners, the closets or even under the sink.

Lastly, Rinnai is also well-known for its durability. In general, tankless heaters are expected to have two times the lifespan of a traditional tank unit. With the right maintenance and installation, a Rinnai tankless heater is capable of lasting for up to 20 years.

With so many models of Rinnai water heater in the market, it can be challenging to pick the right model that suits your needs. However, you do not have to worry anymore, since we have simplified the task for you.

The 6 Best Rinnai Tankless Water Heater Reviews

Top 6 Best Rinnai Tankless Water Heater Reviews

#1. Rinnai RL94IN 9.4 GPM Natural Gas Tankless Water Heaters

Rinnai RL94iN ReviewNowadays, tankless water heaters become more popular as the demand for more efficient home appliances has increased.

A wide range of brands being manufactured by different companies is competing on the market. Experience the never-ending fresh hot water supply, a sleek and sculpted water heater’s design with the Rinnai RL94IN natural gas tankless water heater. Whether you’re building a relatively spacious new home or you are just remodeling your old home, Rinnai LS heaters can always be used in pairs, individually or even banks of 3 or more so as to supply your entire home’s hot water needs.

LS Series units can be literally placed in any type of room, vent them to the outside directors and they also have the integrated condensate collectors. Its exterior-mount units do not require additional venting.

In addition, they can as well be installed in recessed enclosures, then textured or painted so as to match with your home’s exterior design for a clean and inconspicuous appearance. The heater contains the commercial-grade heat exchanger for optimal durability.

Homeowners will also get to enjoy the reliability of the commercial-grade construction and the 12-year limited warranty industry.

Pros & Cons


  • 9.4 Gallons per minute
  • Isolation valves
  • Digital monitoring
  • Significant space savings


  • The Rinnai RL94IN needs a special kind of vent pipe for venting and it does not come with the unit. Other than that, this unit is truly remarkable.

This unit has been proven for reliability and great support. You should keep this into consideration while shopping for the best tankless heater.

#2. Rinnai V65EP 6.6 GPM Outdoors Low NOX Propane Tankless Water Heater

>Rinnai V65EP ReviewDo you need an endless amount of hot water that’s enough for doing laundry, dishes as well as taking a bath all at the same time?

Then the Rinnai propane Tankless Water Heater is just the perfect heater to give you the peace of mind that you have always desired for.

Available in 3 models, the Rinnai propane Heater is suitable for small as well as mid-sized homes. Rinnai’s new Condensing Tankless Heaters also offer all the benefits that builders and homeowners expect from Rinnai. With the Rinnai propane tankless water Heater, you can never run out of the hot water at any time.

Pros & Cons


  • Energy Factor of .82
  • Standard MC-91-2US controller
  • Enhanced scale detection


  • you might face some challenges while installing this heater in your house. But once you’re past that point, it will provide you the service for which it is famous.

This allows you to enjoy the space-saving, ease of installation, convenience and the peace of mind which The Rinnai is famous for.

#3 Rinnai RUC98IN Natural Gas Tankless Water Heater

Rinnai RUC98iN ReviewRinnai RUC98iN offers a very attractive look. This water heater also has innovative and technologically sound water heating solutions for indoor usage.

Pros & Cons


  • 95% thermal efficiency
  • Flexible venting options
  • 9.8 GPM
  • Temperature Locks Function


  • operating cost of Rinnai RUC98IN is relatively higher than other tankless water heaters. But it is a very small price to pay for such an amazing heater.

For indoor usage both in residential and commercial areas, the unit is ideal since it supplies endless amounts of hot water. It is equipped with all necessary trappings of any tankless water heater.

#4 Rinnai RL94IP 9.4 GPM Propane Tankless Water Heaters

Rinnai RL94iP Review
The Rinnai RL94iP is capable of supplying hot water to more than 25 separate outlets continuously while also keeping a consistent temperature. This tankless water heater can provide considerable energy savings which can reach a reduction level of as low as 40%. Due to its high volume, the unit is ideal for the larger residences.

Pros & Cons


  • 9.4 GPM
  • MC-91-1US Digital Controller
  • Concentric venting system


  • This unit is not suitable for extreme cold weather. No others found yet.

This is an amazing unit if you have a gigantic house. In addition to the high capacity in terms of volume, the model also features a high capacity in terms of the number of outlets that it can service. The water heater comes with the standard 5-year warranty and it’s constructed using the same high-quality materials just like the other Rinnai water heaters.

#5 Rinnai V65IP 6.6 GPM Indoor Tankless Propane Tankless Water Heater

Rinnai V65IP ReviewThis is very easy-to-install and ultra-compact heater which will let you enjoy all benefits of the Rinnai tankless water heaters. You will experience clean and reliable hot water supply at a consistently pre-set temperature.

Pros & Cons


  • 6.6 GPM
  • Lower Nox emission
  • Max BTU’s 150,000


  • This unit is non-refundable. This might bug some people a little, but you should not worry about it since this heater is amazing in terms of longevity.

This also avoids water wastage thus helping you in saving. All these features make this heater one of the best heaters of this brand.

#6. Rinnai RUC98iP Ultra Series Propane Tankless Water Heater

Rinnai RUC98iP Ultra Series Propane Tankless Water HeaterFinding the best tankless water heater for an endless supply of hot water for your family or commercial use can be a challenge. It can be even more challenging if you do not want to compromise on essential aspects such as energy savings, a space-saving design, and environmental benefits. If such is the case, Rinnai RUC98iP Ultra Series Propane Tankless Water Heater is an ideal option.

Pros & Cons


  • Concentric or PVC venting option
  • Easy to install
  • Up to .96 Energy Factor
  • Ultra-low NOx emissions
  • 199,000 max BTU
  • Up to 12-year warranty for residential users


  • Users have experienced a water heating delay.

Although, Rinnai RUC98iP Ultra Series Propane Tankless Water Heater ticks all the boxes, however, there are complaints about the heating speed. Users have been complaining that Rinnai RUC98iP takes up to a minute for hot water to reach the connected faucets.


Rinnai Tankless Water Heaters are designed to heat that water as you need and when you actually need it by turning any source of water into hot water as demand arises. With Rinnai water heaters, hot water isn’t limited to the amount of water that storage the tank heater can hold. Whether you’re washing dishes, washing the clothes or even drawing a hot bath, the Rinnai’s tankless water heater technology will definitely provide you with endless supplies of hot water so as to meet all your lifestyle demands.

These are great tankless water heaters for anyone due to their wide range of features. Get yours today and enjoy a first-hand experience from one of the best tankless water heater brands in the world.

Best Rinnai’s Tankless Water Heater Comparison Chart


Free Trial







9.4 GPM

Isolation valves

Digital monitoring

Significant space savings

Sufficient hot water for your home

Circ-Logic technology

120 months heat exchanger,

12 months labor & 60 months parts- Warranty


6.6 GPM

Energy Factor of .82

Standard MC-91-2US controller

Enhanced scale detection

150,000 Max BTU

20 ppm NOx emission levels

No Recirculation Capable


9.8 GPM

Flexible venting options

95% thermal efficiency

Space Saving Design

199,000 max BTU

Temperature Locks Function

Ultra low NOx emissions


9.4 GPM

Isolation valves

MC-91-1US Digital Controller

Significant space savings

Sufficient hot water for your home

Circ-Logic technology

120 months heat exchanger,

12 months labor & 60 months parts- Warranty


6.6 GPM

Free 30-day trial

Energy Factor 0.82

Lightweight and Compact

150,000 BTU

Lower Nox emission

Water Supply Pressure: 20 - 150 PS

Rinnai RUC98iP Ultra Series


9.8 GPM

Energy Factor of .96

Space-Saving Design

199,000 max BTU

Ultra-low NOx emissions

12-year on heat exchanger (residential)

5-year on heat exchanger (commercial)

Please contact us if you got any queries or any confusions about any kind of heaters for your home.


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