Hot water consumption in your household can't keep up with the old gas water heater sitting in your basement. If you're in this situation, a Rinnai water heater may be a solution to your worries. What's the hype with tankless and hybrid water heaters anyway? I'm not sure if they're superior to gas or electric tanks regarding production. But, I do know they don't run out of hot water, which is something our family loves. A tankless water heater has a continuous flow rate. Therefore, it's continually producing hot water. Unlike traditional water heaters, it doesn't store hot water at the base for when you need it.

With that out of the way, you, like others, still have questions you want answers to about tankless heaters. "What size tankless heater do I need?" was one of many issues in mind when transitioning to tankless. Of course, the answer differs for every household. Understanding water consumption in the house and the applications you're using hot water for is of high importance. It will significantly impact the decision you make when selecting a tankless water heater. What I do know is that a tankless water heater is efficient and reduces energy bills. For our household, this was enough for us to make the transition. I made the switch to tankless several years ago and didn't regret it. I hope this information is beneficial to you and helps make the switch as comfortable as possible. Happy hunting!

Comparison Table

How to Choose Your Rinnai Water Heater

When comparing tankless and hybrid water heaters, there are several models to consider purchasing. The Rinnai water heater line is available in HE, HE+, SE, and the SE+ Series systems. When selecting which Rinnai water heater to purchase, some things to consider are:

  • Whether or not (and how frequently) your household runs out of hot water
  • The number of showers you take daily
  • How many loads of laundry the home washes daily/weekly
  • How many family members are using multiple applications requiring hot water during the day

A tankless or hybrid water heater produces a continuous flow rate. This design makes it so that the heater doesn't store hot water at the base like traditional heaters. Instead, it operates by continually producing a certain number of GPM of hot water. The number of gallons necessary will vary in each household, given the above considerations.

Apart from the gallons necessary per minute in the home, there are other aspects to consider when choosing a heater. For example, homeowners must hire the right professional to install the heater. And, this individual should know what the safest place is for them to install the system. Then there are the gas lines, venting, and appropriate connectors which are necessary for the water heater to operate.

These are a few relevant factors homeowners will consider when selecting a Rinnai water heater. Every household's consumption needs vary. Therefore, the series and size of the system they choose will also change.

Benefits of a Rinnai Water Heater

There are several benefits to choosing a Rinnai water heater, instead of traditional gas or electric tank heater. First of all, the continuous flow rate means there's always hot water. Tankless heaters are energy efficient and reduce CO2 emissions. Since the heater is a small box unit, it fits onto a wall. And, homeowners can install it in virtually any room of the home. It isn't going to take up the entire basement of the house as a tank system does. Tankless and hybrid water heaters are upgrades to the home. This upgrade means higher resale value if homeowners plan on selling their home shortly after installing the system.

Rinnai Water Heater Models

When comparing the best Rinnai water heaters available, homeowners can choose from tankless and hybrid models. Depending on the household's water consumption needs, every consumer will want something different. These are some of the basics of the two systems homeowners should consider when comparing Rinnai products.


All Rinnai tankless systems have a Uniform energy factor (UEF) of 0.81 to 0.92, meaning they're highly efficient. They're wi-fi ready and available in natural gas or propane heating varieties. There are also indoor and outdoor tankless heaters. So, every household can find the best system to meet their family's specific needs. The SE and SE+ Series are super-high efficiencies. These heaters have Energy Star Certification, meaning they're highly affordable to operate in the home.


Hybrid Rinnai water heaters offer more hot water and require less time to produce reheat water than tank heaters. On-demand heating and an efficient storage tank minimize the chances of hot water running out. The hybrid system can replenish the entire hot water supply in under 20 minutes.

Average Price of a Rinnai Water Heater

Rinnai water heaters are available in value, ultra, and luxury series models. And, there's also the hybrid tank. Depending on the model and GPM production, they cost $700 to $6000 for a residential heating system.

How We Reviewed Rinnai Water Heater Varieties

In our review of Rinnai heaters, we considered several factors. The GPM (Gallons per Minute) production, indoor vs. outdoor varieties, and on-demand heating were highly relevant in our analysis. We also examined the standard features and the flow rate. Additionally, we analyzed how many uses the heater could produce hot water for simultaneously. Our review explains the ease of temperature regulation, venting, and ease of installation. We included prices and customer reviews in our discussions as well. This information allows each homeowner to find the best system for their family's needs, and their budget.

The Best Rinnai Water Heaters Available

Before choosing a Rinnai water heater, it's important to know the production capabilities of each model. These are some of the best options for single-family households, who require continuous hot water supplies.

Rinnai RHS100 Model Series RHS199100CUiN


Rinnai RHS100 Model Series RHS199100CUiN

This hybrid water heater is wi-fi ready and operates on natural gas. It is an indoor water heater. The hybrid system also includes a residential heater exchange warranty for up to 18-months or 12,000 hours of use. The warranty for labor and repair is 12 months, and 60 months for replacement parts.

It's capable of producing continuous hot water flow for up to four applications in the household at once. It is ultra-low NOx Compliant (ULX). The hybrid system also has a 96 percent thermal efficiency rating. It connects with the Connect-R 2.0 application on smart devices. The mobile app has timers and schedules and allows owners to input information manually as well. It features Rinna Circ-Logic technology allowing homeowners to set their recirculation patterns meeting their consumption needs. This system makes it so that hot water is available when necessary, without increasing energy costs.

The MSRP of this tank is $$ (without installation).

Rinnai V65IP 6.6 GPM Indoor Low NOx Tankless Propane Water Heater
  • Max BTU's 150,000. Domestic Hot Water Flow Rate (Maximum) : 6.5 GPM 831.82 fluid Ounce per minute
  • Max Energy Factor 0.82
  • Meets California and Texas NOx Emissions Standards

The tankless propane heater produces up to 6.6 GPM of continuous hot water flow. The low NOx system has a maximum UEF rating of 0.82. Homeowners living in California or Texas can purchase this system safely, as it meets NOx emissions standards in both. The lightweight and compact system is the entry-level model, and one of the most affordable HE-series models. The tankless heater is for use as an indoor model only.

The tankless system is sufficient for a one to two and a half-bathroom household. It can supply hot water for a family of four seamlessly. Pre-set temperatures range from 120 to 140 degrees Fahrenheit. This level guarantees temperatures won't drop below a certain level when the tank is recirculating the hot water. Temperature ranges from 98 to 140 degrees Fahrenheit are adjustable (by the installer).

In one review, this customer indicates discrepancies with the gallons per minute capacity. The manufacturer claims 6.6 GPM, but the unit has a label that states it's only 3.3 GPM.

The price of this model is $. The average ratings are 4.1 out of 5 stars on Amazon.

Rinnai RLX94iN Luxury Series Natural Gas Tankless Water Heater, 9.8...
  • Circ-Logic ensuring optimum operation of an external circulation pump
  • .82 Energy Factor
  • Isolation valves included for easy maintenance

The luxury series Rinnai water heater is an indoor tankless model. It has ultra-low NOx emission levels and an energy factor rating of 0.82. The 10,300 to 192,000 BTU (max/min) output rating guarantees continuous hot water for up to four applications at once. It also uses Circ-Logic technology allowing owners to set the recirculation patterns in their household. This feature helps reduce energy costs while maximizing hot water production when it's necessary for the home.

The tankless heater is wi-fi ready and produces up to 9.8 GPM of hot water. For families of up to five members, this system should operate efficiently. The product comes with isolation valves as well, making it easier to maintain the system at home. This system meets the strict SCAQMD standards as well. It includes a 12-year heat exchanger warranty, 5-year parts, and one-year labor warranty.

One of the only drawbacks is that the heater is natural gas. Homeowners can't convert it to propane. Additionally, it is a little higher in price than competitor's tankless heaters producing similar GPM flow rate.

The MSRP of this product is $$. However, this price doesn't include the cost of installation. The ratings are 5 out of 5 stars on Amazon.

Rinnai RUCS75iP Tankless Water Heaters, White
  • Professional installation required; call 84-GO-Rinnai for assistance.
  • ENERGY STAR Qualified with an Energy Factor of .93 / Uniform Energy Factor of .90
  • Save time with hot water whenever and wherever you need it, any size home, even for simultaneous uses at multiple...

This Rinnai water heater has adjustable temperature levels from 120 to 140 degrees Fahrenheit. It produces up to 160,000 BTU and delivers up to 7.5 GPM of hot water. There are also four default temperatures allowing owners to adjust the levels quickly. An energy factor rating of 0.93 guarantees efficiency. And, the tankless heater's Energy Star qualification ensures low operational costs.

The indoor model has condensing technologies and two heat exchangers. It is wi-fi ready, and owners can use the 2.0 app to control the heat and timer settings. The tankless heater operates on propane gas.

The only negative aspect of this heater was the installation process. This reviewer notes it requires a concentric vent system, which was difficult to install.

The MSRP of this product is $$, and this price doesn't include installation. The ratings are 4.0 out of 5 stars on Amazon.

Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane...
  • Innovative technology provides an endless supply of hot water
  • Recirculation capability, with or without a dedicated recirculation line Innovative technology provides an endless...
  • Offers both Concentric and PVC, providing more venting options right out of the box

This tankless Rinnai water heater utilizes ThermaCirc360 Recirculation Technology. The Energy Star unit has a 0.92 energy factor rating. This level ensures maximum usability and cost savings in heating bills. The propane gas tank is for indoor use only. It can pump out up to 9.8 GPM of continuous flowing hot water.

This model has a dedicated recirculation line. The technology guarantees continuous, on-demand hot water, for even the most demanding homeowners. It offers PVC and concentric venting options, making it easy to install in nearly any household with a gas-line. The thermal bypass pump and technology reduce the wait time for hot water if it does run out.

This reviewer indicates the unit is a little noisy while operating. They also note that the installation was a bit difficult because the tankless system was heavy.

The MSRP is $$ for this model, without the cost of installation. The average ratings are 4.5 out of 5 stars on Amazon.

Rinnai RUR98eN 9.8 Max GPM Ultra Series Condensing Outdoor Natural Gas...
  • Innovative technology provides an endless supply of hot water
  • Recirculation capability, with or without a dedicated recirculation line Innovative technology provides an endless...
  • Offers both Concentric and PVC, providing more venting options right out of the box

The condensing, tankless water heater produces 9.8 GPM of continuous hot water flow in the household. It has ultra-low NOx levels and Energy Star certification. The 0.92 energy factor and 0.95 Uniform Energy Factor, guarantee efficient performance in any home. This heater can produce continuous hot water for up to four applications. It is best for a one to two and a half bathroom, single-family household.

This tankless system is for outdoor use. The highly efficient model meets California and Texas NOx Emissions Standards as well. It includes a 12-year heat exchanger warranty, five-year parts, and one-year labor warranty. The temperature levels are 98 to 140 degrees Fahrenheit. The installer sets these level settings, and owners can adjust the temperatures using the Rinnai smart app. In most households, it can produce water for up to two showers and two faucets simultaneously.

One drawback of this and other Rinnai models is the preset heat temperature maximums. However, it is possible to adjust the preset levels with the appropriate plumbing tools and equipment.

The MSRP is $$; however, this doesn't include installation fees. The average ratings are 3.9 out of 5 stars on Amazon.

The Best Affordable Water Heater and Best Rinnai Water Heater for Large Families

Whether affordability or efficiency is more important to you, a Rinnai water heater delivers on both fronts. Homeowners in search of affordability will love the RUCS75iP super-high efficiency tank. In addition to Energy Star Certification, the 0.9 energy factor rating ensures the most efficient operation. It produces up to 7.5 GPM of hot water per minute. And, at below $1200 for the tankless system, it's one of the more affordable options in the SE Series.

Homeowners who are looking for the best tankless heater, regardless of price, have many options from Rinnai. The RUR98eN tankless heater is one of the best for larger families. For households requiring more continuous hot water, it produces 9.8 GPM. It operates on natural gas, is wi-fi ready, and meets SCAQMD standards. The Ultra-low NOx levels also make it eco-friendly. Furthermore, the 0.93 energy factor guarantees maximum performance, and quiet operation, from this tankless system.

Regardless of your family's water consumption needs, a tankless water heater is an excellent investment. What's more important is that they'll eliminate those old tank heaters sitting in your basement collecting dust. And they'll surely reduce your monthly energy consumption costs. Additionally, the tankless system will produce continuous hot water. This point might be the most important. If nothing else, it means no more kids fighting in the morning about who gets to shower first.


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