5 Best Outdoor Tankless Water Heaters Reviews

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Tankless water heaters are quickly taking over the market nowadays and that is for a very good reason. Not only are these water heaters more technologically advanced than traditional tank heaters but they also perform a lot better. Why? You might wonder. Well, it’s not that complicated.

Traditional water heaters with tanks simply have a lot of drawbacks and it takes a lot to go around them. But why go around them when there’s something out there that bridges all these gaps for you. Okay, I understand that tankless water heaters might cost you more at first but what we don’t know is that they will eventually make up for their initial cost through better preserving water and energy.

Other people might have some concerns about technical failures and I agree that a full tank gives a sense of security but all that can be simply avoided if only you chose the right tankless water heater. And that’s exactly what we’re doing here.

So, let’s  look at some of the best outdoor tankless water heaters on the market.

5 Best Outdoor Tankless Water Heaters 2021

1. Takagi T-K4-OS-NG Review

Takagi T-K4-OS-NG Outdoor Tankless Water Heater ReviewYour second choice is TAKAGI T-K4-OS-NG which is also a natural gas outdoor tankless water heater but this one is distinctively stronger than its previous rival. The TAKAGI promises a flow rate of 8.0 gallons per minute at somewhere around 40 degrees. Strong units usually require extra ventilation but not this guy because it will do just fine with its built-in ventilation system. Moreover, it is equipped with inlet-outlet thermistors which allow constant monitoring of your water temperature and it also has a built-in freeze protection.

Performance wise, the TAKAGI will exceed your expectation but again that will depend on your requirements. What that means is that this tankless water heater will serve you comfortably for years if you own a medium to small size house hold. You can rely on this heater to provide hot water for shower, your washing machine and your dish washer but it will be struggling if you’re planning to push it harder. Not to your taste? NEXT.

2. Rheem RTG-84XLN Review

Rheem RTG-84XLN outdoor tankless water heater reviewYour third option is the RHEEM RTG-84XLN, and I know what you’re thinking right now: it’s a RHEEM thus it must be good. Well, you are not wrong about that. RHEEM has earned an excellent reputation in the field and that did not come easily. The water heater at hand comes in two different versions which allow you to choose comfortably whatever suits you best: Natural Gas (Rheem RTG-84XLN ) or Propane (Rheem RTG-84XLP).

This RHEEM tankless water heater promises a flow rate of 8.5 gallons per minute at a 35 degrees rise which is more than enough for any user, even if you’re the devil himself. What is really surprising is how quiet such a strong heater can be while functioning. NOTE: do not worry about the fading humming sound after you turn off hot water, that’s only the cooling vent.

That being said, this heater is much stronger than you would expect since it can handle homes with two bathrooms, washing machine, dish-washer… perfectly. Also, the warranty on this product is not bad either as it can go over 10 years if installed by a professional technician. That in itself is significant knowing that these heaters can easily survive up to 20 years of hard labour.

3. Rheem RTG-95XLN Review

Rheem RTG-95XLN outdoor tankless water heater reviewNumber four is one more RHEEM tankless water heater, only this time it is the more powerful.

RTG-95XL which also comes in two models: Natural gas (Rheem RTG-95XLN) and Propane (Rheem RTG-95XLP). Now, beyond carrying a big name, this heater carries an even bigger responsibility to represent. This RHEEM guarantees a flow rate of at least 9.5 gallons per minute at 35 degree rise which is easily an overkill for a small house. That is why this heater is meant to take charge of bigger houses and can take up to 3 bathrooms + other machines.

This model is designed to perform perfectly even at 30 degrees below zero outdoors as long as it is sheltered from wind. Again, make sure to shelter your outdoor tankless water heater no matter the brand because that will surely contribute to durability.

The cherry on top of the cake is the remote control which comes with this unit to ensure user’s satisfaction. Beside the technical aspect of tankless water heaters, one of the most common complaints is how hard it is to control the heat in your shower. Nevertheless, you will not hear the same complaint from RHEEM users because the product allows you to remotely fixate temperature to your taste.

4. Rinnai RL94eN Review

Rinnai RL94eN Natural Gas Outdoor Tankless Water Heater ReviewLast product goes by the name of RINNAI RL94e and it is a product that has recently ‘fired up’ the whole tankless heaters’ scene. This heater guarantees a flow rate of 9.4 gallons per minute which is slightly under the RHEEM. However, it is considerably more advanced on the technological aspect when compared to all heaters on listed here.

This RINNAI comes equipped with a digital controller with error code indicator, making it a lot easier to maintain and use this unit. Hence, this heater can comfortably accommodate for the requirements of a big household. Not only that, this big guy is so strong it can also handle commercial applications as well.

To assure you that the manufacturer trusts their product, this unit will come with an astounding 12 years warranty on heat exchanger, 5 years for malfunctioning parts and one year labour for residential installations. All this makes the RINNAI a great choice for heavy duty.

5. Eccotemp 45H-NG

Eccotemp 45H-NG Outdoor Natural Gas Tankless Water Heater Review 1First is the ECCOTEMP 45H-NG which is a natural gas heater and it runs on a 110 volt power supply. This unit can easily process 6.8 Gallons per minute at a 35 degree rise, 4.5 GPM at a 45 degree rise and 2.6 GPM at a 70 degree rise and that’s not bad at all for a tankless water heater under $500.

This is an outdoor tankless water heater which means it must be installed outside your house and that entails dealing with the weather conditions depending on your country. A common problem for outdoor tankless water heaters is freezing but you’re not to worry about that because this little fella’ has a built-in anti-freeze circuit which will save you a lot of trouble. (Tip: It’s best to build a little “dog house” for your heater or anything that’d shield it from extreme weather conditions).

That being said, the ECCOTEMP is a very reliable/effective water heater which will suit you perfectly if you have a family of 4 to 5 people. However, do not expect any miracles because this heater will force you to respect its limitations and if that doesn’t suit you then let’s move to something more powerful.

Final Thoughts

But then again, these outdoor tankless water heaters are different and any of them could be a great choice depending on your requirements. Nevertheless, there is something that is common amongst all the 5 above and that is quality.