16 Best Tankless Water Heater Reviews

If people worked only when their services were required, they would be a lot more efficient. The same goes with water heaters. Tankless water heaters tend to be more economical as they work only when you need hot water. Furthermore, they take up less space and spend less energy than regular water heaters. According to numerous tankless water heater reviews and experts’ opinions, instant water heaters have taken the market over from traditional ones. If you’re a newbie in this field, you’re probably wondering which tankless water heater is the best or what size to buy. Even though there’s not a single correct answer to these questions, read on to get acquainted with instant water heaters as well as the aspects you need to put into perspective before purchasing one.

Tankless Water Heater Reviews

Tankless Water Heater Reviews

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Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas (6.6 GPM)

When you consider purchasing this model, you must be aware that you’ll have some additional expenses since it operates on natural gas. You may encounter heat loss and a complicated installation process (ventilation issues), but those things are normal when it comes to natural-gas-powered units. On the plus side, this tankless water heater is quite durable (hence the 10-year warranty on heat exchanger and 5-year on all parts) and has a very high-temperature range. Furthermore, this unit has above-average energy efficiency for a natural gas tankless water heater. All in all, this Takagi tankless water heater seems to be a good value purchase since its price is quite reasonable.

Tankless Water Heater Reviews-Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas (6.6 GPM)

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Bosch Tronic 3000

Not only this model fit almost anywhere but it’s also easy to install – simply place it appropriately and plug it in. It’s small enough to be considered portable. In fact, it is it’s mobility and reasonable price that make this water heater a great outdoor option, perfectly suitable for mobile homes as well. Like almost all electric instant water heaters, it has a great efficiency percentage of 98%. There’s a 5-year limited warranty period which is great for a point-of-use tankless water heater. The GPM ranges from 0.5 to 1.8 depending on the device’s power. All things considered, most electric tankless water heater reviews agree that this model is the champion of practicality.

Tankless Water Heater Reviews-Bosch Tronic 3000

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Rinnai V75iN Natural Gas Indoor Tankless Water Heater (7.5 GPM)

This model has an impressive 7.5 gallons per minute flow rate. This means that it can heat enough water for up to three bathrooms. That being said, it can be used for both domestic and commercial purposes. Among other monitoring sensors, it has a scale detection system which reduces the possibility of long-term damage to the unit. Moreover, you’ll get a 10-year warranty on residential heat exchanger and 5-year warranty on other residential parts. Even though it operates on natural gas, it’s highly energy efficient and guaranteed by the Energy Star certificate. Although deemed pricey, reviews assign a great price-quality ratio to this instant water heater unit. After all, you can get it at the world’s largest online marketplace, reducing the price with one of many Amazon promo offers and coupons

Tankless Water Heater Reviews-Rinnai V75iN Natural Gas Indoor Tankless Water Heater (7.5 GPM)

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Ecosmart POU 3.5

In an attempt to determine which is the best electric tankless water heater, 2017 saw many items reviewed. This model is proclaimed to be the best point-of-use unit, recommended for single sink usage only. It has a flow rate of 0.5 GPM which makes it perfect for everyday use in bathrooms, offices, boats, and small homes or condominiums. Since it is energy efficient and durable, it’s recommended for both residential and commercial use. While you can set up the unit by yourself, it’s ill-advised to use it with a shower or multiple fixtures. It is moderately priced and compact sized which makes it one of the best option among all point-of-use units. As it’s designed for everyday use (mainly hand washing applications), it has a limited one-year warranty.


Best Tankless Water Heater-Ecosmart POU 3.5


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Stiebel Eltron Tempra 24 Plus

This model is characterized by the ability to supply hot water even when the demand is high. This is enabled by the Tempra Advanced Flow control system. While other models reduce the heat when the demand is high, Tempra 24 plus reduces the water supply but keeps the temperature steady. That’s why most of the whole house electric tankless water heater reviews recommend this model for homes demanding an unlimited supply of hot water without interruptions. Furthermore, Stiebel’s Tempra 24 plus is easy to install and moderately sized. When you take this model’s price into consideration, the Tempra 24 plus is considered to be a complete package.

Best Tankless Water Heater-Stiebel Eltron Tempra 24 Plus

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Titan SCR2 N-120 (Electric)

This is the lightest and smallest instant water heater on our list which brings us to its greatest advantage – it fits near every utility in need of hot water. Even though the unit’s lightweight, it has a maximum GPM of 4 at a 20°F temperature rise which is enough for taking a shower without having to worry about a cold-water shock. This unit has an energy rating of 99.5%, but there’s a catch – the inlet temperature mustn’t be lower than 65°F in order to keep the required temperature rise. This model doesn’t have any spectacular features, but when you consider the pricing and the item’s consistency – it’s a good value purchase.

Tankless Water Heater Reviews-Titan SCR2 N-120 (Electric)

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Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

This model has a condensing heat exchanger responsible for the 94% energy efficiency rating which is amazing for a natural gas unit. This characteristic is one of the main reasons for placing this model on this 16 best list. However, it’s not the only reason. An admirable flow rate of 9.5 GPM allows multiple applications at the same time which makes it ideal for larger households or commercial use. Pricing and sizing are a small drawback, but when you compare the service you get from this model – it’s a good value purchase. This model is too powerful for occasional domestic use, so consider it only if you need a durable and reliable solution for a larger household.

Tankless Water Heater Reviews-Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

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Camplux 5L 1.32 GPM Outdoor

This product is one of the best outdoor instant water heaters on the market. It’s lightweight, portable, and fueled by natural gas. A flow rate of 1.32 GPM is good enough to take a shower while you’re out camping or while spending time on a remote location in your RV. You’ll need only 2.5 PSI to start up this heater which is the lowest water startup pressure on the market. The maximum temperature rise is near 115°F, and there’s an onboard thermostat powered by a pair of D-cell batteries which allows you to regulate the temperature yourself. The price-quality ratio is also great, so we’ll evaluate this product as a good value purchase.

Tankless Water Heater Reviews-Camplux 5L 1.32 GPM Outdoor

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Noritz NRC98-DV-NG (Gas/Propane)

This model has two heat exchangers inside –  the first one is only pre-heating the water for the second. The primary exchanger’s 0.92/0.92 energy factors are enabled by the condensing function. These numbers are comparable with the efficiencies of some of the best electric instant water heaters, which is admirable. It has a high 9.8 GPM flow rate, but that comes with a price – it’s a bit expensive, and the unit itself is rather hefty. Furthermore, since it’s available at Walmart, you can use one of the Walmart promo offers and get a bargain deal. The warranty period is quite long – 12 years on heat exchangers and 5 years on parts. To sum up, if you’re looking for the best efficiency-power ratio, this model should be at the top of your wishlist.

Tankless Water Heater Reviews-Noritz NRC98-DV-NG (Gas/Propane)

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Westinghouse 11 GPM Ultra Low NOx Natural Gas

Although this unit works on natural gas, it has an Energy Star certification for its amazing energy factor of 0.98. If you decide to purchase this unit, 11 gallons per minute flow rate will be enough to supply all of your hot water needs. This model is installed in the same way as traditional water heaters, so it’s advised to hire a professional. This product is hefty but built to last – hence the 12-year warranty on the heat exchanger and 5 years on other parts. As it will be in your household for a long time, note that it also emits negligible levels of NOx thanks to its combustion control system which also makes this unit eco-friendly.

Tankless Water Heater Reviews-Westinghouse 11 GPM Ultra Low NOx Natural Gas

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EcoSmart Eco 27 Electric Tankless Water Heater (5.3 GPM)

The limited lifetime warranty by EcoSmart goes to show the quality of this product. The stylish design, as well as its small size and reasonable price, might as well be considered as bonus features of this high-quality model. The only problem may be ECO 27’s capacity during high demand periods. However, this problem can be solved by installing a valve which would throttle down the flow rate. This unit has its own module which gives this water heater an astonishing 99.8% energy efficiency. Switching from conventional heaters to this product will cut down your electricity bills by half, making this model the best electric tankless water heater.

Tankless Water Heater Reviews-EcoSmart Eco 27 Electric Tankless Water Heater (5.3 GPM)

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SioGreen IR260 (1.36 GPM)

This model offers something completely different. The IR260 isn’t just an instant point-of-use electric water heater – it also keeps the water clean by using an infrared quartz element. This way, calcium and metallic deposits, as well as corrosion, are avoided. A 1.36 GPM flow rate is more than enough for your everyday point-of-use tankless water heater. It’s pretty light, so it’s easy to install as well as low-maintenance. Furthermore, this unit saves up to 65% energy when compared to any other electric point-of-use tankless water heater. Taking everything into consideration, the price tag is reasonable, so we highly recommend this unit for both residential and commercial use.

Tankless Water Heater Reviews-SioGreen IR260 (1.36 GPM)

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Eccotemp L5 Portable Tankless Water Heater

In many tankless water heater reviews, this liquid propane-fueled unit is considered to be one of the best portable tankless water heaters. Its flow rate of 1.5 GPM produces enough hot water to take an outdoor shower during your camping trip, wash your car, etc. The price-quality ratio is amazing – you get a lot more than you would expect by looking at the price tag. Due to its lightweight and compactness, this model is perfect for camping and boat trips. The only minor flaw is that you get an only 1-year warranty on all parts, including the heat exchanger. However, when you consider the fact that we’re talking about a point-of-use instant water heater, the warranty period is reasonable.

Tankless Water Heater Reviews-Eccotemp L5 Portable Tankless Water Heater

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Navien NPE-240A Gas Tankless Water Heater

NPE-240A is a natural gas-fueled condensing tankless water heater. Speaking of Navien, tankless water heater reviews often wrongfully leave out products by this UK manufacturer. This unit is a bit hefty so If you decide to purchase it, it’s better to hire a professional to install it. Its 8+ GPM flow rate is quite enough to satisfy the hot water demand for an above average sized household. This model is a little pricey, but has a considerable warranty period – 15 years for the heat exchanger and 5 years for parts. Low Nox emissions (20ppm) are also a big plus for this model, so we consider it a solid purchase.

Tankless Water Heater Reviews-Navien NPE-240A Gas Tankless Water Heater

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Marey Gas 10L Tankless Water Heater

Its compact design is one of the main advantages of this model since it’s not that easy to install a natural gas/propane water heater due to ventilation issues. As far as other characteristics go, this model has a flow rate of 3.1 GPM and is activated by water pressure. Furthermore, it allows multiple points of use – 50 feet being the maximum distance from the point-of-use. The warranty period is 5 years on the heat exchanger and 1 year on parts and labor. All in all, this middle-of-the-road model may not be best tankless water heater, but it’s great for that; in other words – if you opt for buying it, you will get exactly what you paid for.

Tankless Water Heater Reviews-Marey Gas 10L Tankless Water Heater

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Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

The second Rinnai product on our list is also a natural gas tankless water heater but has many differences when compared to the Rinnai V75iN unit. First of all, it has a larger flow rate (9.8 GPM) which makes it more suitable for larger households. This model is twice as heavy but is also more efficient than the V75iN model. This unit has an Energy Star certification and a 12-year warranty period on the heat exchanger (5 years on parts). It has a 0.96 energy factor and is characterized by low NOx emissions. The price tag is a bit high, but when you consider all the benefits and use one of the eBay promo codes – this unit is a great value deal.

Tankless Water Heater Reviews-Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

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Best Tankless Water Heater

Buyer’s Guide

Before you firmly decide to purchase a tankless water heater, it is of utmost importance to introduce yourself to the differences which go hand-in-hand with different instant water heaters. Read on to find out what to consider before purchasing a tankless water heater.

Gas vs. electric water heaters

The majority of instant heaters run on electricity. Nowadays, however, it’s not difficult to find natural gas water heaters or the ones that use propane as a fuel source. Natural gas and propane type water heaters are subordinate to electric powered units when it comes to energy efficiency due to heat loss. Moreover, they cost less to operate because they use a gas burner to heat water instead of a copper/metal element. Furthermore, water heats up faster with natural-gas-powered water heaters. On the other hand, electric powered units are eco-friendly and easy to install. The final difference lies in the installation. Natural gas or propane units require proper ventilation. Therefore, your choice depends both on your preferences and the ability to install a certain type of instant water heater (horizontal or vertical ventilation).

Long-term warranty

You don’t have to be a rocket scientist to figure out that a longer warranty period leads to a great value product. According to extensive reviews, a good instant water heater should last at least 20 years. Still, warranties are usually different for the heat exchanger and other parts of a water heater. A heat exchanger usually has a warranty period between 5 and 20 years from the purchase date.

Choosing the right water heater size

How do you know what size tankless water heater to buy?! Of course, you can’t generalize and give an objective answer to such a subjective question. It’s a no-brainer that you’ll need a smaller water heater if your bathroom is not spacious, but there are some other things to consider as well. The required size for a water heater depends on the flow rate, the number of devices you want to run as well as the required temperature rise. To determine all of these factors, you can either hire a professional or do your own research. However, always remember that flow rate is much more important than what size tankless hot water heater to buy.

Determine your budget

Your budget is very important when it comes to buying hefty house appliances, and you must be careful not to overpay for an item you don’t actually need. Always remember that the most expensive water heater isn’t a good fit for everyone. We advise you to set up a price range only when you choose the right size, fuel type, and product manufacturer. If it doesn’t fit your budget, it’s better to wait for a discount or hold off the purchase for a while than lower the bar quality-wise. Nevertheless, according to consumer reports, tankless water heaters are a good investment and they will save you loads of money in the long run. Ultimately, since it’s  a once-in-a-lifetime purchase, it’s a good time to get one of the Groupon coupon codes and enjoy the discount. 

Final thoughts

Taking everything we said so far into consideration, the final choice is yours. Take your time to think this through, because a tankless water heater is not a purchase you’ll make every day, or even annually. According to tankless water heater reviews, longevity is one of their main characteristics, so bear in mind that you’re making a purchase that will last for ages. We hope you have found great value in this article and that our research has guided you towards choosing the best model for your needs.

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