Rinnai Ruc98IN Review – Natural Gas Tankless Water Heater

Rinnai RUC98iNFor those in search of the best water heating machine out there, the Rinnai RUC98iN will get your water heated in a very short time. Interestingly, it works without the need for a tank. This product is a simple application of technology which is aimed to save time, space and cost. The appliance can be installed by almost anyone and it doesn’t require any technical or professional knowledge. If you are used to a tanked water heater, then you should understand how frustrating it can be when faced with the challenges of getting your faulty tanked water heater repaired. This and some other problems are the exact reasons which motivated the design of Rinnai RUC98iN tankless water heater. As you read through this review, you will get to understand the benefits, features and some other fascinating things about this water heater from Rinnai.

Principle Of Operation

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Rinnai RUC98iN is an awesome tankless water heater with an innovative design for the sole purpose of saving money, time and space for homeowners. The tankless water heater is easy to install and doesn’t require an adapter, as it can be installed using both concentric and twin-pipe PVC venting. It makes use of an internal bypass line and integrated re-circulation pump which makes use of less energy because it is energy efficient. The tankless water heater is designed to provide water for house owners on demand. It is a fantastic tankless water heater for so many reasons, of which its working system is its greatest selling point. Unlike a storage tank water heater that needs lots of water to be stored in it, the natural gas tankless water heater doesn’t need a tank and it is just as efficient as the storage tank water heater, as it keeps water warm which is always available when it is needed. Once you need it to perform its functions, the water heater will heat up water for you and will only do this on demand when you’ve turned it on. It works with through a process that makes use of a natural gas, therefore, it doesn’t really store up anything inside a tank, but can quickly turn the water warm in seconds.

Features Of Rinnai Ultra Series

The Rinnai Ultra Series natural gas tankless water heater has an energy factor which is up to 96 ENERGY STAR qualified. The Rinnai Ultra Series is available in five different sizes which are the 130,000 BTU, the 152,000 BTU, the 160,000 BTU, the 180,000 BTU and the 199,000 BTU. It can be installed on either Concentric Polypropylene or dual-pipe PVC/CPVC venting, and this offers homeowners the most efficient and flexible venting choice in just one application of any tankless water heater manufacturer.

The Rinnai Ultra Series efficiently provides hotter water at a faster time by an integrated recirculation pump and RUR models of internal bypass line functioning with or without a dedicated return line. Another of the best features of the Rinnai Ultra Series is that it is easy to maintain, which is achieved with isolation valves. It is also very durable and has a range of sizes to fit your budget.
The Rinnai Ultra Series tank doesn’t take up much space and it is designed to heat up the water properly on demand, thereby saving space and money for the homeowners. It has a modern Self-Diagnostic System that makes it much better for the environment, and it gets to continuously supply clean hot water.

Features of Rinnai RUC98iNRinnai-RUC98iN

The Rinnai RUC98iN is a model of the Rinnai ultra series with a dimension which is 18.5 Inches in width, 26 Inches in height and 10 Inches in depth. The Rinnai RUC98iN tankless water heater has a weight of 61.7 lbs and can be installed indoors in both residential and commercial buildings. It has an energy factor of 0.95 for both gas and propane. The temperature range for residential buildings is between 98°F–140°F, which is pre-set at 120°F and comes with an MC-91-2US controller. For commercial buildings, the temperature range is 98°F–185°F, and it comes with an MCC-91-2US controller which must be bought separately. It has an Ultra Low NOx and a minimum Activation Rate of 4 GPM. The Rinnai RUC98iN tankless water heater has a flow rate of 5.5 at 70°F temperature rise and 7.7 at 50°F temperature rise. It also has a hot water flow rate range of 0.26 – 9.8 GPM, with a minimum and maximum gas rate input of natural gas of 15,200 – 199,000 BTUs. The tankless water heater approved gas types are natural gas or propane. It also comes with multiple venting options, as it can be installed on PVC or Concentric PP. It has four different controllers which are MC-91-2US that are included, MCC-91-2US that is optional for commercial or Hydronic Applications, MC-100V-1US Deluxe Controller that is optional and BC-100V-1US Bathroom Controller that is also optional.


The Rinnai RUC98iN has many benefits which have made it the number one choice for most people who deal with tankless water heaters on a regular basis. The benefits associated with buying this water heater include:

Control: The Rinnai RUC98iN has one of the largest collection of control buttons found on any tankless water heater in the market. This allows for flexibility.

Double Venting: The water heaters can be used with two different venting options, making it one of the few water heater with this freedom. These venting options are the; centric and twin-pipe PVC.

Bigger water inlet and outlet: The water heaters have one of the largest water and gas storage capacity in the industry. Which signifies lasting water, and gas refill takes longer to occur.

Double Gas option: The water heater makes use of both propane and natural gases to power its heating panels. This means even if one option runs out, there is always a backup option.

Indoor And Outdoor Water Heaters

Not to be confused, their names do not have to do with where they are being used. So an indoor heater is not used inside only, and an outdoor heater is not also used outside only. Their names are derived from the location in which they are designed to be installed. An indoor heater is expected to be installed inside the house, with proper venting. An outdoor heater, on the other hand, can only be installed outside the house. There are many factors which might influence the type of water heater an individual might want to get. Some factors are based on common sense, while others are based on mere intuition or lack of knowledge on how the whole water heater system works. Below is a list of factors that influences the choice of the tankless water heater:

Space: Water heater will take up space whether you like it or not. So making sure there is an availability of space indoor or outdoor should help you make the best decisions.

Cost: The cost of a tankless water heater also goes a long way in influencing the decision for anyone planning to buy one. If an indoor water heater like the Rinnai RUC98iN offers more value for money than another outdoor water heater of similar specifications. The chances that a buyer will prefer the Rinnai RUC98iN over the other outdoor water heater is quite high.

Technical Advice: Majority of the time, people don’t just decide on their own to buy a water heater for a new house. Even if they eventually decide to on their own, they still make sure to run the idea by a technical personnel. As a result, people tend to take the advice of their technical personnel, since they will be the one responsible for fixing it in case things go wrong. So if the technical personnel is only conversant with fixing and installing a specific type of water heater, he is sure to advise them to go whichever way he finds convenient the most.

Durability: This is a very important factor when it comes to selecting the perfect water heater for your house. Generally speaking, an indoor water heater is expected to last longer than their outdoor counterpart. This is due to corrosive actions of the atmosphere among other unforeseen occurrences which can severely damage the water heater. The indoor water heater on the other is well monitored and normal things like regular cleaning and also having to pour out acid water formed due to condensation becomes easy to do.

Capacity: The quantity of water a tankless water heater can store is another factor which helps people determine if they will be buying an indoor or outdoor water heater. Majority of the time, outdoor water heaters are larger, as a result of their bigger water storage capacity. Indoor water heaters, on the other hand, are known to be lower in capacity, although there has been the development of ways and methods to help connect two or more similar water heater together.
Selecting the perfect type of tankless water heater boils down to knowing what you want and also making sure it fits your overall agenda and long-term focus. Upon doing this, it usually doesn’t always matter which type your research and basic knowledge of addition and subtraction lead you to.

Advantages and Disadvantage of Rinnai RUC98iN


There are several general advantages rinnai-tankless-water-heater-installation-jones-jones-plumbing-water-heater-repair-replacementassociated with every tankless water heater. On the other hand, having the Rinnai RUC98iN installed in your house is surely going to expose you to some other advantages of owning a standard tankless water heater, you never knew existed. The Rinnai RUC98iN is one of many tankless water heaters that can heat water up to about 95 to 140 degrees Fahrenheit. So if you are the type who likes your bath really hot or you are in need of very hot water. You just need to set this water heater temperature to give you water at this very high-temperature range.
The wide range of water flow rate (0.26-9.8 gpm), this water heater features is another added advantage. The water heater is calibrated to dispense water across several showerheads and faucets all at once. It does this without having to reduce the quality of water flow experience in any of them. Apart from being an “Energy Star-certified Heater”, the heater also has one of the highest energy factors you will find amongst water heater. This factor is said to be about 0.95.


The main disadvantage associated with using the Rinnai RUC98iN water heater is its size and weight. With such a big size, the heater will surely occupy more space than most tankless water heaters. The weight of the heater also makes it difficult to hang on the wall without having to modify a hanger for the unit. This size and heaviness can, however, be blamed on the amount of power packed in the water heater.


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There is no point in buying any gadget when you know deep down it will not last. As bad as this sounds, people do this on a daily basis. Their decisions might be due to the cost of the correct product or just the superior marketing skills of whoever is selling the substandard products to them. This is a very bad spending approach, which might ruin your finances in the long-run. A wiser spending is making sure you have done proper research on the item you intend on purchasing. In this article, so far, we have been able to cover the most important things to note about the Rinnai RUC98iN tankless water heater. More research on this product can be done by you also if you are still skeptical about this water heater. You can start why reading through more reviews on Amazon by clicking here. Rinnai is a major brand in the water heater manufacturing industry and the Rinnai RUC98iN is another product which exemplifies all the positive attributes of a worthy indoor water heater. So if you are still deliberating on which water heater to get for your home, the Rinnai RUC98iN is likely to steal your heart from the onset.

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