Rinnai RU199iN Tankless Water Heater Reviews

Rinnai RU199iN Tankless Water Heater

Good day, fellow homeowners, DIY enthusiasts, and business people looking for cost-effective solutions. I’m pleased to present my highly efficient and versatile Rinnai RU199iN tankless water heater reviews.

Known for its quality and reliability, the Rinnai brand is a go-to for businesses and homes seeking long-lasting performance. As a trusted resource for all things plumbing and utilities, I make it my job to test the latest innovations thoroughly.

Over several weeks of hands-on use, I put the RU199iN model to the test – powering multiple showers and laundries and simultaneously using every tap in the house. I evaluated aspects like power output, temperature control, ease of installation, energy efficiency, and overall user experience.

In the following review, I’ll share my in-depth findings on this compact yet mighty heater. We’ll cover everything from its endless hot water capacity to optimal water pressure. I’ll also discuss honest user feedback and essential factors to consider.

I aim to provide a well-rounded perspective to help you determine if this unit is the right choice for your commercial or residential needs. So, without further ado, let’s get started exploring what may be the perfect tankless solution!

A Short Overview

The Rinnai RU199iN boasts several key features that set it apart from traditional water heaters. Firstly, it is highly energy-efficient due to its condensing technology, which recycles heat from exhaust gases. Compared to conventional models, the RU199iN can save up to 40% on energy costs.

Additionally, it offers precise temperature control with advanced electronics, ensuring consistent hot water delivery at the desired temperature. The unit also has an impressive flow rate of up to 11 gallons per minute.

One significant advantage of the Rinnai RU199iN is its space-saving design – being compact allows for flexible installation options even in small spaces such as closets or attics.

Furthermore, since it provides hot water on demand without needing a storage tank, users can access an endless supply of hot water whenever required. This eliminates concerns about running out of hot water during peak usage periods or long showers. On the other hand, some potential drawbacks include the complexity of installation, which may require professional assistance, and initial cost investment that might be higher than traditional storage tank heaters.

Features of Rinnai RU199iN Tankless Water Heater

Endless Hot Water

Rinnai RU199iN Tankless Water Heater

Instead of storing hot water in a tank, the Rinnai RU199iN heats water instantly while it’s flowing through the pipes. This means an unlimited hot water supply anytime – no more running out!

It has a built-in circulating pump called Circ-Logic that can work with an external pump. The pump moves hot water through the pipes even when you’re not using it.

Then, when you turn on the sink or shower, hot water arrives right away because it’s already in the pipes waiting. No more shivering under the faucet as you wait for it to heat up!

You can schedule the pump to move water at certain times, like early morning when everyone showers. Or you can set it to “on-demand,” and it will only circulate when hot water is used somewhere in the house.

This makes hot water instantly available all around your home without wasting any. It also saves water compared to storage tanks since none sits unused.

Best of all, you’ll always have hot water, no matter how big your family is or how long everyone’s showers are. So, relaxation and comfort are endless with this Rinnai tankless water heater!

Energy and Space Efficient

This Rinnai tankless water heater is small but mighty. Even though it doesn’t take up much room, it provides unlimited hot water for your home.

How can something so compact do such a big job? The secret is that it only heats water as you use it. Unlike bulky storage tanks that constantly reheat gallons of stale water “just in case,” this unit only turns on its heating elements when an outlet is opened.

This on-demand design is so much more efficient. You’re not wasting electricity heating water that sits there for hours without anyone using it. The Rinnai calculates precisely how much hot water is needed and heats it immediately without wasting any extra.

Its tiny size lets you install it almost anywhere, even above showers, to reduce heat loss down the pipes. No more big, bulky traditional tanks taking up half your basement!

And all that efficient “only when needed” heating adds to significant monthly savings on your power bills. Over its lifetime, you’ll save more than enough to offset the higher upfront cost compared to regular water heaters.

Plus it’s protecting the environment too by using less electricity. Small but mighty – this Rinnai unit shows how you can have unlimited hot water without the high costs or large footprint. Pretty cool.

Optimal Water Pressure

Rinnai RU199iN Tankless Water Heater

The Rinnai RU199iN can produce heating up to 11 gallons of water per minute (GPM). That’s a solid flow rate – way more than most people need!

In perspective, the average shower only uses around 2 GPM. So this heater could handle like five showers going at once with ease.

It maintains that powerful stream steadily, too. Unlike storage tanks, where the pressure drops off when multiple taps run, the Rinnai keeps outputting a constant 11 GPM no matter how many fixtures are used simultaneously.

That means things like multiple showers, laundry machines, and dishwashing all happening together won’t cause any weakness in flow. You’ll get the same great shower regardless of what other appliances are on.

The manufacturer even says it can power up to 7 central water-consuming items like washers and dishwashers, all running at the same time. Now that’s impressive power!

So whether you’re a family of 6 or run a business, this tankless unit delivers intense, dependable pressure for all your hot water needs in a big way. No pressure drops, just pure power!

Professional Installation Recommended

While installing a water heater may seem straightforward, tankless systems like the Rinnai have unique requirements to operate safely and effectively.

The Rinnai RU199iN unit needs proper gas/electrical hookups sized for its high-performance needs. A water piping setup is essential for optimal flow without pressure drops.

Doing it yourself risks mistakes that could be dangerous, like faulty gas or electric connections. Even minor errors may cause efficiency or warranty issues down the line.

Rinnai’s qualified professionals, called Rinnai PROs, complete extensive product and installation training directly by the manufacturer.

They know all the brand’s setup intricacies and local codes inside out. A quick install by a PRO ensures everything is permitted and up to regulations.

Finding a PRO on Rinnai’s website helps you locate technicians who are experienced specifically with their innovative systems.

A pro install may add a small fee but save potential repair costs later. Rinnai can only honor the warranty if a certified pro does the job.

Leaving the installation to qualified experts makes good sense for hassle-free enjoyment of your Rinnai. Let the PROS do what they do best!

Users Experience about Rinnai RU199iN

Users have reported various positive experiences with the Rinnai RU199iN Tankless Water Heater. One of the most notable benefits is its energy efficiency, as it only heats water on demand rather than continuously heating a large water tank. This leads to a decrease in energy consumption, ultimately translating into lower utility bills.

Additionally, users appreciate this tankless water heater’s continuous hot water supply. Unlike traditional storage tanks that may run out of hot water during peak usage times, the Rinnai RU199iN ensures a constant supply of hot water for showers, washing dishes, and other household activities.

Furthermore, users are impressed by the space-saving design of this tankless water heater. Its compact size and wall-mounted installation option frees up valuable floor space in homes while still delivering efficient performance.

Despite its many advantages, some users have encountered negative experiences when using the Rinnai RU199iN Tankless Water Heater. These include challenges during installation, maintenance issues, and inconsistent temperature control.

Installation can be complex for inexperienced individuals or those who need proper plumbing knowledge. Some users have reported difficulties correctly connecting gas lines or venting systems, leading to delays or additional costs for professional assistance.

Maintenance issues have also been highlighted by users who faced challenges accessing specific components for cleaning or replacing parts when necessary. This can affect the longevity and performance of the water heater.

Inconsistent temperature control has been another concern expressed by some users. They have reported fluctuations in water temperature, causing discomfort during showers or other tasks requiring precise hot water temperatures.


The Rinnai RU199iN Tankless Water Heater receives my highest recommendation as a best-in-class product. Its endless hot water supply, powerful pressure output, and energy efficiency make it a brilliant investment.

While installation and maintenance demand some technical proficiency, leaving the job to certified Rinnai PROs quickly solves this. Their expert work ensures optimum performance, safety, and warranty coverage. The small additional fee pays for guaranteed reliability.

Comparing the long-term cost savings to storage tanks, both in utilities and space usage, this unit provides exceptional value. Its versatile design allows homes and facilities of all kinds to benefit.

User feedback proves satisfaction from both everyday conveniences and long-lasting quality construction. Minor complaints can likely be addressed through routine servicing or software updates.

The compact yet mighty Rinnai continues to lead the industry with innovations like Circ-Logic. This takes tankless convenience and comfort to an even higher level that homes and businesses genuinely appreciate.

For those prioritizing endless hot water, power, efficiency, and durability, I have no hesitation in naming the RU199iN a top pick. Its proven track record leaves no doubt – this unit delivers on all fronts year after year.

In short, the Rinnai RU199iN defines what’s possible from modern tankless technology. Its advantages make it a sound choice for any application. Simply put – it’s an investment that pays off right from day one.

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