Rheem RTG-64XLN Outdoor Tankless Water Heater Review


Chances are that you are looking for ways to save money on your utilities and, perhaps, reduce your impact on the environment. One of the best ways to do this is to look for ways to improve the efficiency of your home, starting with the most egregious energy wasters. If you have a traditional hot water heater, you need look no further for a huge energy sink. With a traditional hot water heater, you needlessly keep a huge tank of water hot at all times, regardless of you actual hot water needs. Just think about all the time you AREN’T using hot water, and that all that water is kept hot just in case.

This is why homeowners are moving over to tankless water heaters for their hot water needs. With a tankless system, you get on-demand hot water, but without the waste of constantly keeping tens of gallons of water hot at all times. In a system like this, the water is heated as you need it as soon as you turn on a hot water tap. These units save energy and can significantly lower your monthly energy bills.

Things to consider when choosing a gas-powered tankless water heater

The two main things to consider when you start looking for the right gas-powered tankless water heater are the cost of the heating system and whether or not you are going to have your system professionally installed. Firstly, these systems come in a wide range of shapes and sizes with extra functionality and features. This means that the price range is also quite varied. Setting a budget ahead of time will make it easier to whittle down those options that fall outside your budget.

If you are a novice at home improvement projects, it is highly recommended that you have your system professionally installed. This is a complicated system that can even require gas lines be installed and plumbing modifications be made. When you have your system installed by a professional, you get the peace of mind that it has been installed safely and properly by people who have the tools and expertise for the job.

Rheem RTG-64XLN 6.4 GPM Low NOx Outdoor Tankless Natural Gas Water Heater

Rheem is a well-known and highly trusted manufacturer of a range of different utility-related appliances, as well as the various components that are required to install, repair, and maintain utility systems. They have a wide range of high-quality gas-powered tankless water heaters that are well suited to families of different sizes and with a host of hot water needs.

The RTG-64XLN provides great value for a whole-home tankless water-heating system. This is a great choice for those who have heavy-duty hot water needs or for larger families. It is a natural gas powered tankless water heater that is a low NOx version which allows for reduced emissions.

This is strictly an outdoor tankless water heater, meaning that it cannot, under any circumstances, be installed inside. The unit comes with a UMC-117 remote control, as well as 10’ of thermostat wire to give you more versatility in placement.

This is a powerful unit that boasts 6.4 GPM (gallons per minute) at a 35° temperature rise. What this means is that your water gets hotter, faster, and stays hotter for longer. It utilizes advanced burner technology and has one of the highest flow rates of any natural gas-powered tankless water heater.


If you have considered a tankless water heater but aren’t sure if there is a good unit that can meet the needs of a larger family, or those who have heavy-duty hot water needs, the RTG-64XLN is a great choice at a great price. It is a natural gas-powered tankless water heater that provides superior water flow and gets your water hotter, faster. This is an outdoor only unit, meaning that it MUST be installed outside, and it comes with accessories that give you more play in where you can install the unit.

With a tankless water heater, you can have all the hot water you want, without having to waste a lot of energy in the process. These units make it possible to have on-demand hot water without the inefficiency. You get hot water, reduce your utility bills and energy consumption, all at the same time. Once you see your energy savings, it’s easy to see why so many people are switching to tankless water heaters for their hot water needs.

Rheem RTG-64XLN

Rheem RTG-64XLN


8.2 /10


8.6 /10


  • high efficiency burner
  • remote control included
  • ultra low emissions


  • outdoor installation only

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