REVIEW: The Rinnai RUC98iN Ultra Series

If you are looking for a natural gas tankless water heater of excellent performance, consider getting the Rinnai RUC98iN, one of the top-rated products in the market thanks to its innovative condensing technology and its superior efficiency. This review is designed to provide you with some clear information on why an increasing amount of users choose to purchase this model over the vast assortment available in the market.

Rinnai, during its several years on the market, had been able to create a reputation of a trusted brand delivering quality products with attractive designs and highly performant. Keep reading to learn more about this model and why you should consider getting this tankless water heater.

Features of The Rinnai RUC98iN

What makes the Rinnai RUC98iN different from its competitors? Learn more about the special features of this model in this section.

Superior Efficiency

In general, adopting a tankless water heater in your houseful means increased energy efficiency and costs savings. These products do not need to heat high volumes of water in a tank, which saves not only energy in the long term but also space. The Rinnai, above all the other models, is characterized by superior efficiency which will guarantee fewer expenditures consistently over the long term.

One of the biggest advantages consists of the longer life shelf as compared to regular models and other competitors. That means that by purchasing a RUC98iN you’ll be guaranteed that your investment will last at least 20 years as opposed to the 10-15 years lifespan that a traditional heating system might have.

It is worth mentioning that this model has an energy factor up to 0.96, meaning that its energy conversion efficiency is pretty high. When looking for an energy-efficient system that guarantees you high levels of performance, check out this tankless water heater.

You’ll Save Precious Space

When looking for a compact heating system that does not grab the attention too much and that can fit even in the smallest spaces, the Rinnai RUC98iN model might be one of your best solutions. Aside from being beautifully designed, this model also adapts to be installed indoor without taking up too much space.

You’ll Save Up On Energy

One of the greatest benefits of the tankless heater from Rinnai is that installing it will able you to experience a significant deduction in your energy bill thanks to the 95% Thermal Efficiency that characterizes it. That means that with the Rinnai Water heater you’ll be able to enjoy hot and steamy showers any time of the year without having to spend too much on your utility bills!

It Is Rather Easy To Install

This version nifty to have as opposed to other heating systems that need hours and hours to have installed, so you’ll have it operational and prepared. Careful to not get tempted and install it yourself though, don’t forget to follow the directions. Better have an expert to install it correctly if you’re reluctant to mess up this at a certain stage.

Low NOx Emissions

When talking about health, you want to make sure your water heater is low in NOx and might cause combustion. When you choose to install the Rinnai RUC98iN, the problem posed by NOx is almost nonexistent.

Indeed, with this product, you don’t have to worry about NOx emissions but you’ll still be able to enjoy fully efficient operations. Low NOx emissions mean that you can protect yourself and your family from the harmful effects of these gases, without compromising on the efficiency of the heater.

You’ll Get Hot Water Whenever You Need It

This Rinnai Tankless model is not only characterized by superior energy efficiency, but it is also one of the best products to source water heating from, without having to worry about the outside weather conditions. This heater, despite being extremely compact, it is supplied with enough power to guarantee an efficient supply to both you and your loved ones with hot water.

The great thing is that this Rinnai Tankless heating system does not only last a lot longer than other conventional tanked systems, it also guarantees you a constant supply of hot water during the day, no matter how much volume you need.

You Can Count On A Generous Warranty

It’s not old news anymore that things can fail. The great thing about this Rinnai model is that the superior quality of this product allows the brand to guarantee a generous warranty of 12 years on the heat exchanger, a one year warranty on the labor, and 5 years warranty on the components.

Which follows that the moment something goes wrong, you won’t have to worry about getting it repaid. When it comes to investing in water heaters, it can be a good idea to check the warranty it comes equipped with, to ensure you can get the assistance you need when you need it.

Don’t Forget To Give It Appropriate Maintainance!

This tankless heater is extremely efficient, but that doesn’t mean that it doesn’t require maintenance! Indeed such heaters can corrode over time due to mineral accumulations and might require a purging system in place to avoid such accumulation. To set the seal on high performance at all times, make sure you regularly check on it.

Also, you might want to consider a venting system to avoid any possible problems and ensure high performance at all times.


  • Energy saving
  • Superior Efficiency
  • 12-year warranty
  • It fits even in the smallest spaces
  • Little NOx emissions
  • Durable and highly performant


  • Might be expensive
  • You’ll need a commercial controller for commercial uses

The Bottomline

The Rinnai RUC98iN is a great tankless water heater that you should consider if you are looking for a top of the edge, high-end item that won’t disappoint even during the coldest winters. Its innovative technology and sleek designs only contribute to making a good product, loved by an increasing number of users.

It is not only highly efficient, but this water heater is also undeniably user-friendly and very safe, thanks to its low NOx emissions. When stuck in your decision, do not hesitate to trust this model!

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