Best Tankless Water Heaters in 2023 - Top Choices and Reviews

If you are seeking an energy-efficient option to heat up water, a tankless water heater is worth your consideration. Moreover, since there is no tank to store water, tankless water heaters are much smaller than conventional models with tanks. They quickly heat water as it enters the appliance to provide an endless supply of hot water. If you are interested in this kind of device, let’s dig out into this article to have more information about the best tankless water heaters.

You can refer to other articles for more options, about best water heaters, best gas water heaters, best electric water heaters, and best propane tankless water heaters.

1. Rinnai RU199iN Condensing Tankless Hot Water Heater

Product’s Specifications

• Power Source: Gas Powered

• Item Dimensions: 22.05 x 14.76 x 33.86 inches

• Weight: ‎74.1 Pounds

• Voltage: 120 Volts

• Installation Method: Wall Mounted

Product’s Highlights

The Rinnai RU199iN has a great ability of producing hot water up to seven separate fixtures at the maximum flow rate of 11 GPM. The 199,000 BTU maximum is more than sufficient for a typical household of adults, teenagers, and children to finish their morning routines without the drop of heat. 

Despite having a natural gas system, the appliance is Energy Star-certified and has an efficiency rating that ranges from 93 to 96 percent. This is because of the function that enables the heater to extract as much heat as possible before dispersing it via the air.

Pros

• Provide heated water for up to 7 fixtures

• Energy Star-certified model

• Wall-mounted option

• Wi-Fi compatibility

Cons

• Costly

2. Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater

Product’s Specifications

• Power Source: Battery Powered

• Item Dimensions: 12.63 x 8.25 x 3.63 inches

• Weight: ‎‎0.01 ounces

• Voltage: 240 Volts

Product’s Highlights

Rheem 240V has a 99 percent efficiency rating, which is rarely seen in a tankless water heater in this price range. This means that practically all of the power you pay for is used to heat your water, as opposed to gas versions that waste energy through venting.

The Rheem 240V Tankless Water Heater won't be very useful in a large home with many simultaneous uses. But with a maximum 4 GPM flow rate and 45,000 BTU output, it is adequate for a small household with one or two inhabitants. This is a wonderful value option due to the affordable unit as well as the generally cheaper cost of electric tankless water heaters when compared to gas. 

Pros

• 99 percent efficiency rating

• Easy to use 

Cons

• Not ideal for large household

• Not Energy Star-certified

3. Stiebel Eltron Tankless Heater – Tempra 36 Plus

Product’s Specifications

• Power Source: Hard Wiring Required

• Item Dimensions: 4.63 x 16.63 x 14.5 inches

• Weight: ‎‎‎23 pounds

• Voltage: 240 Volts

Product’s Highlights

The Stiebel Eltron Tankless Water Heater has energy efficiency at 99 percent, quiet operation, an amazing maximum flow rate of 7.5 GPM, and 92,000 BTUs. This type, like other electric tankless water heaters, provides instant cost savings on the purchase of the unit and the cost of installation.

The Advanced Flow Control function helps maintain hot water when in use and prevents showers from cooling off or fluctuating in temperature. With a digital display, you can also discover how much you have saved by replacing an inefficient model with this Stiebel Eltron.

Pros

• 99 percent efficiency rating

• Quiet operation 

• Advanced Flow Control feature included

• Built-in digital display

Cons

• Not compatible with all water fixtures

4. Hike Crew Portable Propane Water Heater

Product’s Specifications

• Power Source: AC/DC power

• Item Dimensions: 17.75 x 16.5 x 14.85 inches

• Weight: ‎‎‎23.9 pounds

• Voltage: Not mentioned

Product’s Highlights

The Hike Crew Water Heater can be used for both indoor and outdoor purposes. It can work as a hot water source for camping showers, dishwashing, and equipment rinsing thanks to the built-in pump.

This water heater has a handle for carrying. It attaches to AC/DC power and comes with a hand shower to give hot water wherever you need.

The little appliance has a safety valve that will turn the burner off when the water supply runs out or the temperature hits 125 degrees F. This portable model is best used as a transportable unit because it only uses 1 GPM and 42,000 BTUs.

Pros

• Built-in pump and carrying handle

• Hand faucet with shower head included

• Connects to AC/DC power

• Safety shutoff function

Cons

• For light-duty only

5. ECOTOUCH ECO90 Water Heater 

Product’s Specifications

• Power Source: Corded Electric

• Item Dimensions: ‎15.74 x 10.24 x 2.05  inches

• Weight: ‎‎‎10.93 pounds

• Voltage: 240 Volts

Product’s Highlights

The ECOTOUCH ECO90 Water Heater is a great choice for small households with its own 1.5 GPM and 30,500 BTU. The power output of this model is sufficient for a single bathroom or kitchen. With a 99 percent efficiency rating, almost any heat won’t be lost before the water gets to other fixtures.

This model is compact and has a modern touch-screen design, making it blend well with the décor rather than just occupy your space. It also has self-modulation controls that will help you keep an eye on the water temperature to prevent it from getting dropped. Although this model won't heat the full house, it may be a fantastic hybrid option for a bathroom.

Pros

• 99 percent efficiency rating

• Touch-screen 

• Self-modulation controls

Cons

• Just sufficient for 1 bathroom

1. What tankless water heater size do I require?

The size of the tankless water heater needed will rely on how many people will be living there, how much water will be used, how big the house is, and the typical temperature in the region. 3 to 5 GPM water heaters are ideal for homes with 1 to 3 people, while 8 or 9 GPM models are suitable for homes with 4 and more people.

2. How does a tankless water heater operate?

When cold water goes through a water heater, it will be heated using a heat exchanger). In the unit, the water circulates through a number of loops to ensure that it has enough time to attain ideal temperatures before leaving at the hot water source for use.

3. How long does it take to get hot water on a tankless system?

The tankless devices need around 15 seconds to heat the water to the desired temperature, but you still have to wait until the hot water reaches your shower or faucet.

You're about to begin looking for the ideal tankless water heater? Now you have all the basic info needed to look for in one. Before buying a water heater, you can also search for some other customer reviews for a better understanding of the product you are going to choose.