Rinnai RL75IN Tankless Hot Water Heater Review: Top Pick?

Rinnai RL75IN

Last updated on May 5th, 2024 at 03:48 am

Imagine stepping into a shower with the confidence that you’ll never run out of hot water before you’re ready. The Rinnai RL75IN Tankless Hot Water Heater promises just that—a continuous flow of hot water, precisely when and where you need it.

Its compact design is like having a little bit of magic tucked away, ready to reclaim valuable space in your home, all while providing up to 7.5 GPM of hot water.

Poring over user experiences, it’s clear this heater is a favorite for its reliability. It’s durable too, with a generous warranty and built to last, ensuring a smart investment for your home.

Moreover, its energy efficiency is a game-changer for reducing utility bills. Rinnai RL75IN’s smart features, such as Circ-Logic technology, allow you to customize recirculation patterns to match your lifestyle, meaning hot water is always at the ready when you are.

Bottom Line

The Rinnai RL75IN Tankless Hot Water Heater could be a game-changer in how you experience hot water at home.

It’s sustainably smart, spaciously small, and steadfastly steady. Ready to make the switch?

Click here to buy the Rinnai RL75IN Tankless Hot Water Heater on Amazon and start enjoying endless hot water!

Overview of the Rinnai RL75IN Tankless Hot Water Heater

When considering upgrading your home’s hot water system, the Rinnai RL75IN presents an interesting option.

This unit is lauded for its ability to keep up with the demand for hot water without occupying too much space. Below, we’ll touch on its design, efficiency, and smart features, which are compelling reasons why it might just be the right fit for your home.

Compact Design

Imagine reclaiming space in your utility closet or basement — the RL75IN allows you to do just that. Only the size of a small suitcase, the unit is unobtrusive and can be discreetly mounted and vented out a single wall or roof penetration.

Even if you have a small home, saving space with a compact design doesn’t mean you’ll sacrifice the ability to use multiple showers or appliances simultaneously.

High-Efficiency Heating

The promise of never running out of hot water while being energy-efficient can be a real game-changer. The RL75IN achieves this by adjusting its burn rate to the demand, providing up to 7.5 gallons per minute and saving energy.

This operation means you’re only using fuel and energy when you need hot water — a smart move for your utility bills. Although tankless units are typically seen as an upfront investment, the energy savings over time could make it a financially savvy choice in the longer term.

Smart Technological Integration

This Rinnai model is built with future integration in mind. It’s compatible with Rinnai’s Controlr module for Wi Fi connectivity, which is sold separately.

With this addition, you’ll have the convenience of controlling your hot water’s timing and water temperature from your smartphone. The level of control and convenience afforded by technology means your hot water system can adapt to your lifestyle seamlessly.

The performance of the RL75IN is underscored by its warranty, showing Rinnai’s commitment to durability. Although it’s recommended to have professional installation, Rinnai products provide peace of mind through its Find a Rinnai PRO service, ensuring that you can enjoy your new tankless water heater without a hitch.

While customer feedback varies, as with any product, the consensus appears to point towards satisfaction with the RL75IN’s performance. Some users mentioned how the consistency of hot water supply improved their daily routines, while a few noted the importance of professional installation for optimal operation.

Keep in mind that tankless systems do come with their own set of considerations, such as ensuring your home’s gas lines can meet the unit’s requirements.

As for unique features that set the RL75IN apart, its Circ-Logic technology is particularly intriguing. This tech allows the unit to learn your hot water usage patterns for more efficient heating cycles, a feature that further enhances its efficiency and user-friendliness.

Additionally, its non-condensing technology is a reliable option that speeds up the service and installation compared to condensing models.

In summary, the Rinnai RL75IN offers you the benefits of tankless water heating without dominating your space or demanding too much upkeep. It’s a modern solution for hot water that marries convenience with eco-conscious operation.

Before you decide, be sure to weigh its smart features and compactness against your household’s needs and usage patterns.

Performance and Efficiency

When it comes to energy savings, the Rinnai RL75IN shines among its peers. With its Energy Star certification and Uniform Energy Factor of 0.81, you’re looking at a unit that is recognized for its efficient use of natural gas to heat water.

Users often compliment its ability to provide a consistent flow of hot water on demand, something traditional water heaters with tanks struggle to maintain. This efficiency translates into cost savings on your utility bills over time, making it a wallet-friendly choice for conscious consumers.

Notably, it doesn’t run out of hot water mid-use due to its maximum flow rate of 7.5 GPM, ensuring that your showers or chores aren’t interrupted by sudden cold spells—a drawback often mentioned for tank systems.

However, like any appliance, it’s not without occasional hiccups, with some reports of interruptions in hot water flow. These seem to be rare and often resolvable with standard maintenance.

Overall, if you’re considering a switch from a tank to a tankless system, the RL75IN’s performance and energy-saving features could not only make your life more comfortable but also contribute positively to your energy consumption footprint.

Installation and Maintenance

When considering a tankless water heater like the RL75iN, you’ll appreciate that the installation is a one-time event that promises enduring benefits. Hiring a professional is usually the best route to ensure proper setup, and while this adds to the initial cost, the investment ensures the unit operates efficiently.

Expect installation costs to vary based on factors such as the complexity of your home’s layout and existing plumbing.

Once installed, maintaining the RL75iN is relatively straightforward. An annual inspection by a qualified technician can keep it running smoothly, and this might include flushing to remove mineral buildup, checking the burner, and inspecting the vent system for any obstructions.

Tankless units, lacking a reservoir for sediment to accumulate, typically face fewer maintenance issues compared to traditional water heaters. The RL75iN also comes with the assurance of Rinnai’s reputation for reliability and a supportive warranty, details of which can be found with the manufacturer.

Regular maintenance not only prolongs the lifespan of the unit but also ensures you enjoy that consistent stream of hot water without hiccups.

Pros and Cons

When it comes to efficient hot water solutions, tankless heaters have become a go-to option for many households. Let’s weigh the advantages and disadvantages of the Rinnai RL75IN, known for its sleek design and reliable performance.


  • Never-ending Hot Water: You’ll love the continuous flow of hot water this unit provides, ideal for multitasking through those busy morning routines or for your large family’s needs.
  • Space-Saving: Its compact design ensures it won’t take up unnecessary space. You can reclaim the area that a traditional water heater might have consumed. You can mount it in virtually any room and indoor locations.
  • Smart Technology: Equipped with advanced features, the heater learns your usage patterns to provide hot water efficiently with its Circ-Logic technology.
  • Strong Warranty: Rest assured with a comprehensive warranty covering various components like 12 years for heat exchanger and 5 years on parts, offering peace of mind over its long-term durability.
  • Quiet Performance: Enjoy the serenity of your home without the noise disturbance of a running heater.


  • Professional Installation Needed: You’ll want to budget for a professional installation since the manufacturer highly recommends it for optimal safety and performance.
  • WiFi Control Module Separate: Keep in mind that if you’re looking to remotely manage your heater via WiFi, you’ll need to purchase an additional module.
  • Delivery Woes: Although not a direct fault of the product, there are mentions of shipping issues, so ensure you inspect your delivery for any mishandling.
  • Initial Cost: Upfront, the price point may be higher than traditional tanks, so consider this as an investment in your long-term energy savings and convenience.

Remember, while the Rinnai RL75IN offers a strong blend of performance and convenience, the requirement for professional installation and the separate purchase for WiFi control are points to consider when making your decision.

Customer Reviews

In looking through what others have said about the Rinnai RL75IN, you’ll find a mix of appreciation and a few concerns.

Users love its high efficiency and low operational noise. Imagine the convenience of rapid heating without any clatter—this tankless water heater seems to deliver just that. The included external control doesn’t lose its settings easily, enhancing its user-friendliness.

If you’re curious about longevity, there’s good news: Some have had a seamless hot water experience for nearly a decade, which is pretty impressive. Others are pleased with the cost savings, especially when replacing rental units with this purchase.

However, not everything is perfect. There are reports of intermittent hot water flow, leading to the rare but necessary service call. This can be a little hiccup in an otherwise smooth operation.

Installation appears to be straightforward, with one user highlighting the ease and another confirming how well it worked immediately after setup. But, an external factor mentioned is the delivery process, as some suggest the packaging could be more robust to withstand handling.

Overall, people seem satisfied with their investment, weighing in the advantages of this Rinnai model, despite a few drawbacks. Your experience might vary, but the consensus is that this is a dependable choice for endless hot water.

Cost and Value

When considering the Rinnai RL75IN, it’s important to weigh the heater’s price against its long-term benefits. Priced competitively, the heater promises energy efficiency which, in the long run, could mean savings on your gas bill. Users have experienced a decade of reliable operation, suggesting a return on investment that justifies the upfront cost.

Price comparison: The RL75IN is in line with the market rates for tankless water heaters, especially when factoring in its 7.5 GPM flow rate and natural gas efficiency. With a high rating from numerous customers, you’re likely getting a solid mix of quality and cost-effectiveness.

However, you should consider potential service calls as part of your cost calculations. A few users reported needing repairs after extended use, which is relatively normal for household appliances.

Many buyers express satisfaction, noting that despite the initial outlay, the performance and durability offer good value for money. With the added convenience of an endless supply of hot water and space-saving design, the RL75IN checks many boxes for those looking to upgrade their hot water system without overspending.

Final Thoughts

When considering the RL75IN, you’re looking at a tankless water heater that has been generally well-received. Several users have found its efficiency and the convenience of continuous hot water to be a game-changer. Its silent operation and quick heating capabilities have also made a positive impact. More, it is easy to install.

Despite its strengths, there have been instances where users experienced interruptions in hot water flow, although these appear to be infrequent over the product’s lifespan. The external control feature has been lauded for its reliability, avoiding the need for persistent reconfiguration.

One aspect that’s drawn attention is the shipping and handling process; some customers suggest that the manufacturer could improve the packaging to prevent any superficial damage during transit.

In summary, your investment in the RL75IN could translate to long-term savings and dependable hot water supply. It seems like a solid choice, especially if you’re ready to switch from traditional hot water tanks to a more modern, tankless system.

Keep in mind, though, that no product is without potential hiccups, so weigh these factors carefully in your decision.

Alternative Options for Consideration

While the Rinnai RL75IN natural gas tankless water heater consistently delivers hot water and energy savings, there are other options that might cater to your specific requirements.

If budget is a top concern, consider a more cost-effective model like the EcoSmart ECO 11, which is suitable for smaller homes or regions with warmer climates, providing ample hot water at a reduced upfront cost.

For those prioritizing space-saving design and efficiency, the Stiebel Eltron Tempra 24 Plus is an electric model that offers silent operation and a sleek look. This heater is well-known for its reliability and performance in households where saving space is crucial.

If you’re located in an area with colder incoming water temperatures, consider the Takagi T-KJr2-IN-NG; it’s designed to provide strong performance even when the demand for hot water is high, making it a solid choice for mid-sized homes.

Lastly, if you’re looking for a unit that’s extremely user-friendly and comes with smart home integration, the Rheem RTEX-13 Electric Tankless Water Heater integrates directly with your home automation systems, ensuring seamless operation and control.

Keep in mind that installation requirements and performance can vary widely, and it’s important to assess your home’s needs carefully before making a decision.


  • Edmund Yeo

    🌱 I'm passionate about sustainable living and renewable energy, and I'm thrilled to share my journey towards a greener, brighter future with you. Join me as I explore the latest innovations, eco-friendly lifestyle tips, and inspiring stories from the forefront of the green energy revolution. Note: This website uses affiliate links which may earn a commission for purchases made at no additional cost to you.

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