7 Best Tankless Water Heaters 2022 Reviewed

The advent of best tankless water heater has proven that its possible to drastically cut on energy bills, water used, and overall money spent on heating water. The energy efficiency and convenience have prompted many people to switch from what they originally used to these powerful models- and most are pleased they made the switch.

We are hopeful that this review on top tankless water heater will bring you more insight and make it easy for you to switch or upgrade.

You can also checkout Best Electric Tankless Water Heater or look as a specific brand Navien Tankless Water Heater Reviews 

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Review: 7 Best Tankless Water Heater 2022 Reviewed

1. Rinnai RUC98iN Tankless Water Heater

The first spot for the Best Tankless Water Heater goes to Rinnai RUC98iN tankless heater. The Rinnai RUC98iN is one of the most powerful and efficient heater on the market. It has many exceptional features and most users are pleased with its high performance.

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This water heater is an indoor tankless water heater intended for both commercial and residential use. It requires gas or propane to function. It also has several venting options.

The Rinnai RUC98iN is ecofriendly and efficient tankless gas water heater. It has received energy star certification. You’ll be surprised to note that this model only needs 2 watts while on standby mode and less than 64 watts when being used actively. It comes with an energy factor of up to 0.95. However, during winter, it uses roughly 146 watts to maintain water hotness and prevent it from freezing.

Furthermore, this model features a sleek and compact design. Since its small in size, you can practically set it up anywhere. You don’t need to re-arrange you entire home looking for a perfect spot. Consider under the sink, on the countertop, or even mounting on the wall.

The Rinnai RUC98iN also has great water flow rate. This model will deliver 0.26 to 9.8 gallons/minute. This is sufficient water to ensure all your faucets and bathrooms have uninterrupted supply of hot water.

Another thing is that, the temperature on this model ranges between 95°F to 185°F. Therefore, you can adjust your hot water accordingly.


  • Two venting options
  • Space-saving design
  • Great water flow rate 0.26 to 9.8 GPM


  • Expensive

2. Bosch Electric Water Heater Tronic 3000 T 

This tankless electric water heater from Bosch comes with many great features. Most users swear by its efficiency and high performance in delivering hot water.

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The Tronic 3000 electric tankless water heater is way convenient than other heater in the same category. It generates 7.5 gallons/minute and it can fit perfectly under the sink. Alternatively, you can mount it on your wall either horizontally or vertically to give continuous supply of hot water.

Since its compact in design, it can fit in apartments, offices, or other small sized houses or spaces perfectly. It features a glass-lined tank to ensure more efficiency.

On top of that, you can use this best tankless electric water heater to supplement another source or it can be the only water heating system for point of use applications. This means, you get instant hot water at any time or place.


  • On demand water heater
  • Easy Installation
  • Can control the temperature
  • Compact design


  • Some customers complain that the company doesn’t honor the warranty

3. Stiebel Eltron Tankless Electric Water Heater

The Stiebel Eltron is one of the most powerful and best tankless water heater you can decide to select.

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The model features Thermostatic Temperature Control. This means the water temperature adjusts itself to meet the hot water needs of the entire household. On top of that, the heater can regulate its power output in line with the incoming water to ensure you get your preferred hot water temperature.

This model also features superior water flow technology.  This technology enables the model automatically maintain hot water temperatures.   This means you get to enjoy uninterrupted flow of hot water.

With this electric heater, you don’t expect any noise while using. It’s also small and compact. So fitting it in your house should not be an issue. Further, you don’t need any venting.

Another exceptional feature is the Intuitive Temperature Display. The large display will indicate the temperature of your water in an easy to understand format. Other than that, the dial selector ensures you get to adjust the water temperature to your most desired level.


  • High performing unit
  • Takes roughly 6 hours to self-install
  • Automatic flow rate
  • Reliable Intuitive Temperature Display


  • Some users complained that the heater was not heating the water as they had expected, so they returned the product.

4. EcoSmart ECO 27 

The ECO 27 is another high performing unit you might want to consider especially if you’re on a tight budget.  It’s has a compact design, hence, you get to save on space.

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This unit features digital temperature control. Therefore, you get the benefit of adjusting and regulating your water temperature, any way you like. You can add the temperature by 1-degree increments.

ECO 27 also boasts of a patented modulation system. This system boosts energy efficiency by over 99.8%. It also enables you save over 50% on energy bills. It’s also one of the best tankless electric water heater and its ideal for cottage, cabin, small apartments and small offices

Another feature for ECO 27 is the excellent flow rate. This unit can generate about 3 gallons/minute of hot water in regions with very cold climates. In areas with warm climates, the unit can deliver about 6 gallons/minute. This means you get to use the sink and 4 showers all at the same time.


  • Great flow rate
  • Compact and elegant design
  • Highly durable
  • Exceptional digital temperature control


  • Some customers have complained that the company doesn’t honor its warranty

5. Rheem RTGH-95DVLN 9.5 Tankless Water Heater

Another awesome residential tankless water heater is the Rheem RTGH-95DVLN.

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With a hot water flow rate of 9.5 gallons/minute, you can do several activities simultaneously. For instance, you can run two showers, the dishwasher, and the washing machine all at the same time.

Another feature is the intelligent electronic controls. The electronic controls allows you adjust the hot water temperature to your preferred level anytime you taking a shower, doing the dishes, or even laundry or any other activity that requires hot water.

This model also comes with a self-diagnostic system. With system, you can easily tell when the heater has issues. Hence, take necessary measures.

This Rheem takless water heater also comes with an inbuilt freeze protector. Therefore, you can use this model in regions with temperature as low as 30°F. Further, this freeze protection device lessens the possibility of water freezing during extremely cold climates.


  • Best for cold climates
  • Great water flow rate 9.5 GPM
  • Energy efficient saves up to 94% of energy
  • Has Intelligent electronic controls


  • Expensive



We hope this review has been helpful and it will guide you in choosing the best tankless water heater. All the reviewed products are the best available on the market today. Go ahead and switch or upgrade to a tankless water heater. You should consider the following factors before making a purchase: the energy rating, household size, flow rate, and the installation cost.

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