Rheem RTE 13 Electric Tankless Water Heater Review

DIMENSIONSL 15 x W 12.4 x H 6 inches

Replacing a water heater is nobody’s idea of a good time. It is a costly expense and there are tons of things you have to take into consideration when choosing the best water heater for your needs. It is easy to look towards the cheapest standard model, as this is an expensive thing to have to replace, but this is often a really bad idea in the long run.

Traditional water heaters are incredibly inefficient and they waste a ton of energy keeping a huge tank of water hot at all times, regardless of whether anyone needs it or not. This is why so many people have chosen to switch to the tankless water heater. With a tankless system, there are no tanks; water is heated near the point of exit when turn on the hot water tap; this means that water is heated only when you need it, saving you energy and reducing your total resource usage.

Things to consider when buying a tankless water heater

First and foremost, you will need to determine your budget parameters. Hot water heaters come in a wide range of shapes and sizes, with different features and levels of functionality, which is why they come in such a wide range of price points. By setting your budget ahead of time, you can easily eliminate options that are outside your price range and save a lot of research time.

Perhaps the most important consideration comes in determining what your actual hot water needs are so that you can get the system that best meets your needs and demands. This essentially requires that you make a list of the appliances in your home that require hot water and then finding out what the average flow rates for these appliances is. You can then add up all the different flow rates to give yourself a better estimate of what flow rate you require to meet your home’s needs.

You will also want to have a professional come out and take a look at your electrical (or gas) and plumbing systems to ensure that your home is set up to accommodate a tankless water heating system. It is also recommended that you have a professional install the system rather than trying to do it yourself. It can be complicated and even dangerous, so this is something that is best left to those with the tools and the knowhow.

Rheem RTE 13 Electric Tankless Water Heater

Rheem is a popular and trusted brand of home utility-related appliances and accessories such as sensors, fittings, and more. They also make a wide range of tankless water heaters that are suitable for various power needs and different energy inputs.

The RTE 12 Electric Tankless Water heater is a powerful heater and an excellent value. This heater is Energy Star certified, so you know that it incredibly efficient.

Unlike other electric tankless water heating systems, this one uses a standard 1/2″ water connection, so you don’t have to do a lot of retrofitting to properly install this system. It is fitted with a brass and copper heat exchanger, which is highly efficient and durable.

This is the perfect water heater for most small households. It has modulating power and a maximum flow rate of 4 GPM (gallons per minute), which makes it suitable for a wide range of hot water needs from showers to washing machines.

The system has an on-unit temperature control panel that makes it easy to set your desired water temperature. It also has an LED indicator to show whether the elements are active or if the system is in standby mode. It is lightweight and small, making it a great choice for people with limited space.

The system boasts a 10-year warranty, giving you peace of mind that your investment is protected. It is durably built from quality materials and was finely machined for long term use.


An electric tankless water heater is an excellent investment if you find yourself in the market to replace a traditional hot water heater. Tankless water heaters are incredibly efficient and can use half the energy of a traditional water heater without requiring you to sacrifice water temperature or pressure. Models like the Rheem RTE 13 are designed for regular, everyday use and are well suited to handling even heavy hot water demands. This system was designed with standard measurements, which allows for easier installation than many comparable models.

Rheem RTE-13

Rheem RTE-13


8.0 /10


7.5 /10


  • rugged and reliable heat exchanger
  • ultra-compact size
  • on-unit temperature control with LED indicators


  • size of extension whip is #8 but recommended size is #6
  • can cause lights to flicker when operating

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