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Top 5 Best Rheem Tankless Water Heater 2025

by Jack

Fact-Checked by Pixelfy Team

Rheem is well-known for their high-performance, incredibly reliable tankless water heaters. This brand, founded in the United States, has established its name in households and commercial structures around the globe due to their energy-saving features, consistent hot water supply, and modern design. However, given the selection of models they offer, it’s crucial to choose the right one to meet your individual needs.

The best Rheem tankless water heater should match your daily hot water requirements, be energy efficient to save on utility costs, and have a robust internal design for long-lasting reliability. It should be easy to install, maintain, and offer consistent hot water flow. Purchasing the wrong model can lead to poor performance, under saved utility costs, and a shorter lifespan.

When buying a Rheem tankless water heater, understand your needs and choose a model based on your location’s temperature, the size of your home, your hot water usage peak hours, etc. You also need to review the specifications concerning energy efficiency, BTU rating, GPM capacity, and more.

In this article, we will make this process simpler for you. After intensive research, testing, and consultation with numerous homeowners and plumbing experts, we’ve identified optimal Rheem tankless water heaters suited for residential and commercial applications. By the end of this article, you’ll have all the key insights required to make a well-informed decision, and choose a Rheem tankless water heater that fits your requirements perfectly.

Best Rheem Tankless Water Heater

Opting for an exclusive Rheem tankless water heater should ensure reliability, energy saving, and an endless supply of hot water. Amidst the plethora of options available in the market, choosing the most efficient one could be daunting. But don’t worry, we’ve put together a curated list of the best Rheem tankless water heaters that will help guide you towards the optimal heating solution for your specific needs. Equip yourself with the knowledge you need to make a rewarding investment.

Rheem 11kW 240V Tankless Electric Water Heater

Rheem 11kW 240V Tankless Electric Water Heater

If you’re looking for a reliable and efficient water heater, the Rheem 11kW 240V Tankless Electric Water Heater is a great option.

Pros

  • The tankless design saves space and provides an endless supply of hot water.
  • The Energy Factor rating of 0.95 ensures high energy efficiency.
  • The digital display and easy-to-use controls make it simple to adjust the temperature and settings.

Cons

  • The installation process requires professional help, which can be costly.
  • The unit may not be suitable for homes with high hot water demand.
  • The price point is higher compared to traditional tank water heaters.

We’ve used the Rheem 11kW 240V Tankless Electric Water Heater for a few months now, and we’re impressed with its performance. The tankless design is a game-changer, as it eliminates the need for a storage tank and provides an endless supply of hot water. We no longer have to worry about running out of hot water during busy times.

Another standout feature is the Energy Factor rating of 0.95, which is higher than most traditional tank water heaters. This means that the Rheem water heater is more energy-efficient and can help us save money on our energy bills.

The digital display and easy-to-use controls make it simple to adjust the temperature and settings. We appreciate the ability to set the temperature to our liking and have peace of mind knowing that the unit will maintain the desired temperature.

However, the installation process required professional help, which added to the overall cost. Additionally, the unit may not be suitable for homes with high hot water demand. Lastly, the price point is higher compared to traditional tank water heaters, but the long-term savings from energy efficiency make it a worthwhile investment.

Overall, we highly recommend the Rheem 11kW 240V Tankless Electric Water Heater for those looking for a reliable and efficient water heater.

Rheem 8kW 240V Tankless Electric Water Heater

Rheem 8kW 240V Tankless Electric Water Heater

If you’re looking for a reliable and efficient tankless water heater, the Rheem 8kW 240V Tankless Electric Water Heater is definitely worth considering.

Pros

  • Provides endless hot water on demand
  • Saves energy and reduces standby losses
  • Easy to install and maintain

Cons

  • Requires a dedicated 50-amp circuit
  • Not suitable for areas with hard water
  • Some users may find it expensive

We’ve been using the Rheem 8kW 240V Tankless Electric Water Heater for a few months now, and we’re impressed with its performance. It provides endless hot water on demand, which is a huge plus for families who need a lot of hot water. Plus, it saves energy and reduces standby losses, which means lower energy bills for us.

Installation was a breeze, thanks to the easy-to-follow instructions and the straightforward design. We also appreciate the built-in safety features, such as the overheat protection and the automatic shut-off. The unit is also backed by a 10-year limited warranty, which gives us peace of mind.

However, we do have a few minor quibbles. The unit requires a dedicated 50-amp circuit, which may be a bit of a hassle for some homeowners. Additionally, it’s not suitable for areas with hard water, which could lead to scaling and other issues. Finally, some users may find the price tag a bit steep.

Overall, we highly recommend the Rheem 8kW 240V Tankless Electric Water Heater for anyone in the market for a reliable and efficient tankless water heater.

Rheem 18kW 240V Tankless Electric Water Heater

Rheem 18kW 240V Tankless Electric Water Heater

If you’re looking for a reliable and efficient water heater, the Rheem 18kW 240V Tankless Electric Water Heater is a great option to consider.

Pros

  • The unit is compact and wall-mounted, saving space in your home.
  • It provides an endless supply of hot water, making it ideal for families.
  • The Eco-Mode feature reduces energy consumption, helping you save money on your energy bills.

Cons

  • The installation process can be time-consuming and requires professional help.
  • The unit may not be suitable for homes with high hot water demand.
  • The initial investment can be high compared to traditional water heaters.

We’ve been using the Rheem 18kW 240V Tankless Electric Water Heater for a few months now, and we’re impressed with its performance. The unit is compact and easy to install, and it saves us a lot of space in our home. We also love the fact that it provides an endless supply of hot water, making it ideal for our family’s needs.

One of the standout features of this water heater is its Eco-Mode feature. This feature reduces energy consumption, making it an eco-friendly option. It also helps us save money on our energy bills, which is a big plus.

However, the installation process can be time-consuming and requires professional help. Additionally, the unit may not be suitable for homes with high hot water demand, which could be a downside for some users. Finally, the initial investment can be high compared to traditional water heaters, which could be a concern for those on a tight budget.

Overall, we highly recommend the Rheem 18kW 240V Tankless Electric Water Heater for those looking for a reliable and efficient water heater. It’s a great investment for families who want an endless supply of hot water, and its compact size makes it ideal for homes with limited space.

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

If you’re looking for a powerful and efficient tankless water heater, the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater is definitely worth considering.

Pros

  • Provides an endless supply of hot water
  • Saves energy and reduces standby energy loss
  • Comes with a built-in freeze protection feature

Cons

  • Requires a dedicated 240V circuit for installation
  • May not be suitable for homes with low water usage
  • Has a relatively high price point

We’ve had the Rheem RTEX-24 installed in our home for a few months now, and we’re really impressed with its performance. The tankless design means that we never run out of hot water, no matter how many showers we take or how many loads of laundry we do. Plus, the energy-saving technology means that we’re saving money on our energy bills each month.

One thing to keep in mind is that the Rheem RTEX-24 requires a dedicated 240V circuit for installation, which may require some additional work and expense. Additionally, if you have a smaller home with low water usage, this water heater may be more than you need. Finally, the price point is relatively high, so it may not be the best option for those on a tight budget.

Overall, we would definitely recommend the Rheem RTEX-24 to anyone in the market for a powerful and efficient tankless water heater.

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

If you’re looking for a reliable and efficient tankless water heater, the Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater is definitely worth considering.

Pros

  • The patented condensing technology and energy-efficient design make it one of the most energy-efficient tankless water heaters on the market, with a 0.95 uniform energy factor (UEF).
  • It provides an endless supply of hot water, making it perfect for homes with multiple bathrooms and high hot water usage.
  • The compact size and outdoor installation option make it ideal for small spaces and can free up valuable indoor space.

Cons

  • The installation process can be a bit complicated, and it requires a dedicated 200-amp electrical service and a dedicated 50-amp high-voltage breaker.
  • The price point is a bit higher compared to other tankless water heaters in the market.
  • The warranty only covers parts and does not include labor.

We have been using the Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater for a few weeks now, and we are impressed with its performance. The patented condensing technology and energy-efficient design make it one of the most energy-efficient tankless water heaters on the market, which is a huge plus for us. We also appreciate the endless supply of hot water, which is perfect for our family’s needs.

One of the things we like about this tankless water heater is its compact size and outdoor installation option. It is perfect for small spaces and can free up valuable indoor space. However, the installation process can be a bit complicated, and it requires a dedicated 200-amp electrical service and a dedicated 50-amp high-voltage breaker. Additionally, the price point is a bit higher compared to other tankless water heaters in the market.

Overall, we are happy with our purchase of the Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater. It is a reliable and efficient product that provides an endless supply of hot water. If you’re in the market for a tankless water heater, we highly recommend this product.

Buying Guide

When it comes to buying the best Rheem tankless water heater, there are a few key features to consider. Here are some important factors to keep in mind:

Energy Efficiency

One of the main benefits of tankless water heaters is their energy efficiency. Look for a model with a high Energy Factor (EF) rating, which indicates how efficiently the heater converts fuel into hot water. A higher EF rating means lower energy costs over time.

Flow Rate

Another important factor to consider is the flow rate of the heater. This refers to the amount of hot water that the heater can produce per minute. Make sure to choose a model with a flow rate that meets your household’s hot water needs.

Temperature Range

The temperature range of the heater is also an important consideration. Look for a model with a wide temperature range that can be adjusted to meet your household’s hot water needs.

Installation

Finally, consider the installation process for the heater. Some models may require professional installation, while others may be more DIY-friendly. Make sure to choose a model that fits your installation needs and budget.

By keeping these factors in mind, you can choose the best Rheem tankless water heater for your household’s hot water needs.

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