Rinnai vs Rheem: Tankless Water Heater Brands Comparison!

Last Updated: 2019/08/28

If you are planning to get a water heater today, purchasing a tankless heater might do you a lot of benefits. Apart from the fact that this system is portable and easy to move from one place to another, it is also efficient and provides a lot of water every time there is a need for it.

In the market today, the two most recognizable brands that are known for the production of tankless water heaters are Rinnia and Rheem. There have been many controversies on which is the best between the two. It is essential to know that but are efficient and works effectively.

This article has been written to give you everything you need to know about these two products.


Rinnai is a Japanese multinational company based in Nagoya, Japan. It was established by Hidejiro Naito in the 1920s about 100 years ago. This brand is known for manufacturing gas appliances which include energy-efficient tankless water heaters, home heating appliances, kitchen appliances, gas clothes dryers, and commercial-use equipment such as rice cookers, grillers, fryer,  and salamanders.


Rheem is an American privately held manufacturer that is known for the production of residential and commercial water heaters and boilers as well as heating, ventilating and air conditioning (HVAC) equipment. This company also produces and sells under the Ruud brand name. While Rheem was established in 1925 in Richmond, California, Ruud was established in 1897 in Pittsburgh, Pennsylvania.

Apart from the fact that this brand is regarded as the largest manufacturers of both water heating and HVAC equipment in the United States, it has also made thousands of production in countries such as Iraq, Kuwait, Mexico, Armenia, Australia, Zealand, and others.

Comparison of Rinnai and Rheem

Before you decide which one you should purchase between these two products, it is vital to consider some factors and to look in for some features in these two units. Some of these features are:


This is one of the essential factors to put into consideration before going for a tankless water heater. Apart from the fact that a product with a simple installation procedure saves time and energy, it also helps to save up extra cash that would have been paid to a plumber.

For Rinnai, you would be able to install it without any difficulties. Products from this brand most of the time come with step-by-step instruction that would help you throughout the installation procedures. Likewise, Rheem also produces easy to install products.


These two brands have a compact and sleek design that is attractive and easy to move from one place to another. With Rinnai, you would need a little about of space to install it, thereby, giving room for the installation of other kitchen and bathroom items.

Although Rheem also has a compact design, it occupies more space than Rinnai products. However, you would be able to install other products either in the bathroom or in the kitchen with the installation of a model from Rheem.

Fuel Source

Rinnai and Rheem brands are both powered by gas. Rheem offers natural and propane gas, which helps you to heat your water within a short period. Alongside this, Rheem products are equipped with multiple venting options.

For Rinnai, it is made with a pre-attached half-inch gas line compatibility mode, which makes it very convenient and easy during installation.

Energy Efficiency

Both Rinnai and Rheem are regarded as energy efficient water heaters. The two brands use tankless technology, which helps you to save more money on electric bills. Likewise, both brands are eco-friendly and produce adequate water needed in the right period.

Since these two companies manufacture tankless water heaters, there is no need to worry about buying a replacement tank.

Maintenance and Operation

For Rheem, it has a condensing heat body. Also, it has a remote control that allows you to operate the units without many difficulties. It features an EZ-Link Wire that connects two tankless water heaters to function as a single unit and its high-altitude performance.

Rinnai, on its own hand, does not require much stress or expenses to keep it clean. Likewise, it is a versatile product and can be used both as a natural gas and propane water heater.

Who Wins?

Since you have gotten a better knowledge of how these two brands work, there would be no difficulty purchasing the right one for you. However, it is essential to know that getting any of the two means you are buying a water heater that would give you 100% satisfaction and would last for an extended period.