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5 Best Low Amp Tankless Water Heater Reviews, Ratings and Buying Guides

Low amp tankless water heater

A tankless water heater is a serious investment. The upfront cost is very high. However, they can save the homeowner a good amount of money over time. This article will look at a few different types of low amp tankless water heaters and clarify some of the confusion around them. You will also see a few models that we recommend and why.

1. Rinnai V53DeN Natural Gas Tankless Hot Water Heater, 5.3 GPM

Best Outdoor

Rinnai V53Den Tankless water heater

Specification

  • Activation GPM: 0.6
  • Uniform Energy Factor (UEF): 0.81
  • Water Connection: 3/4”
  • Gas Connection: 3/4”
  • Flow Rate (Max): 5.3 gallons
  • Flow Rate (Mini): 0.3 gallons
  • Gas Input BTU(Max): 120,000
  • Gas Input BTU(Min): 15,000
  • Water Pressure PSI (Max): 150
  • Water Pressure PSI (Min): 20
  • Temperature (Max): 140
  • Temperature (Mini): 115
  • Depth, Height, Width (inch): 10, 27, 18
  • Weight: 33 pounds
  • Installation place: Outdoor
  • Fuel Type: Natural gas
  • Vent Type: Vent Free
  • Recirculation: No
  • Natural Gas Thermal Efficiency: 0.82
  • Voltage: 120V
  • Gas thermal efficiency: 0.82
  • AHRI Certified & CSA Approved: Yes
  • Heat Exchanger Warranty: 10 years.

Rinnai V53Den provides 10 years heat exchanger, 5 years parts, and 1 year for labor warranty. At 35F temperature rise, the capacity of hot is 06 gallons to 5.3 gallons.

The product dimension is 10” depth, 27” height, and 18” width which is a compact design and the weight is light.

The product has no temperature controller. But on the front panel, there is an error code indicator.

To operate the heater you need natural gas source with electricity. The minimum gas input is 15000 BTU and the maximum is 120,000 BTU.

Pros

  • LED Error Code Indicator Compact and light.
  • Save 40% in energy cost.
  • Have an Error Code Indicator.
  • On-demand endless water supply.

Cons

  • Not available temperature controller.

2. EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

Best Indoor

EcoSmart ECO 11 Electric tankless water heater

Specification

  • Activation GPM: 25
  • Uniform Energy Factor (UEF): 0.98
  • Water Connection: 1/2”
  • Flow Rate (Max): 3.1 gallons
  • Temperature (Max): 140F
  • Temperature (Mini): 80F
  • Depth (inch): 3.75
  • Height (inch): 11.5
  • Width: 8
  • Weight: 6.5 pounds.
  • Fuel Type: Electricity.
  • Installation place: Indoor.
  • Recirculation: No
  • Wattage: 13000 watts.
  • Voltage: 220V
  • AMP: 57A
  • Thermal efficiency: 99.8%
  • Number of breakers: 1
  • CSA Approved & AHRI Certified: Yes
  • Warranty: Lifetime*

EcoSmart ECO 11 Electric Tankless Water Heater is a self-modulating technology. The tankless heater is 90% smaller than the convention water heater. And it is certified by NSF/ANSI 372.

The product dimension is 3.75” depth, 8” width, and 11.5” height. The maximum temperature 140 degree Fahrenheit and the minimum is 80F. To install the device you need only one breaker and you can install it indoor.  

On-demand, it can supply endless water. And if you want to increase the temperature you could increment it 1 degree Fahrenheit.

Pros

  • On-demand endless water supply.
  • Self-modulating technology.
  • The max flow rate 3.1 gallons.
  • Certified by NSF/ANSI 372.
  • 90% space saver than conventional.

Cons

  • Need clean mineral from the heat exchanger.

3. EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology

Best Point-of-use

EcoSmart ECO 18 elcectric tankless water heater

Specification

  • Activation GPM: 0.3
  • Water Connection: 3/4”
  • Flow Rate (Mini): 3.51 gallons
  • Temperature (Max): 140F
  • Temperature (Min): 80F
  • Depth (inch): 3.75
  • Height (inch): 17
  • Width (inch): 14
  • Weight: 11.25 lbs
  • Installation place: Indoor
  • Vent Type: No
  • Fuel Type: Electricity
  • Recirculation: No
  • Voltage: 240V
  • AMP: 75A
  • Wattage: 18000 watts.
  • Thermal Efficiency: 99.8%
  • Number of breakers: 2
  • CSA Approved: Yes
  • Warranty: Lifetime*

With this tankless water heater you can save up to 60% on utility bills than the conventional water tank heater and it is also a space saver.

Since it is a point-of-use, so you don’t need any vent you could connect it directly to the sink.

The device can provide 1.8 to 4.3 gallons. You can easily operate two showers with this device. The model has a digital temperature control system. You can change the temperature swiftly.

Pros

  • The device is highly durable.
  • Save 60% cost.
  • Self-modulating technology.
  • On-demand endless water supply.
  • Never out of hot water.
  • It is easy to use.

Cons

  • Sometimes sensors have issues but rare.

Need Battery for Tankless Water Heater? Here For You: 5 Best Battery Backup for Tankless Water Heater

4. Stiebel Eltron Tempra 15 Plus Electric Tankless Whole House Water Heater, 240 V, 14.4 kW

Best Seller

Stiebel Eltron Tempra 15 Plus Electric tankless water heater

Specification

  • Activation GPM: 0.5
  • Water Connection: 3/4”
  • Flow Rate (Max): 8 gallons
  • Flow Rate (Mini): 0.5 gallons
  • Water Pressure PSI (Max): 150
  • Water Pressure PSI (Min): 30
  • Temperature (Max): 140F
  • Temperature (Min): 86F
  • Depth (inch): 8.5
  • Height (inch): 19.5
  • Width: 21.5
  • Weight: 16.1 pounds
  • Installation place: Indoor
  • Includes Remote: No
  • Heating Technology: Electric
  • Fuel Type: Electricity.
  • Vent Type: Vent Free
  • Recirculation: No
  • Thermal Efficiency: 99%
  • Voltage: 240V
  • AMP: 60A
  • Wattage: 14400 watts
  • Number of breakers: 2
  • CSA Approved: Yes
  • Warranty: 7yr on leakage.

Stiebel Eltron Tempra 15 Plus Tankless Water Heater can be used for tubs, sinks, and showers. It has an advanced flow control system that always monitors the temperature. If the output water temperature is below the settings then it will automatically reduce the flow rate to maintain the temperature.

It doesn’t make noise when it is working. It doesn’t require venting and the heating chamber is solid copper. The device has an auto-modulation system that saves energy. Save 15-20%  utility bill than the conventional.

Keep in mind that you have to install it vertically.

Pros

  • Advance flow control.
  • Compact design.
  • On-demand endless water supply.
  • Energy-saving features.
  • Totally silent operation.

Cons

  • Professional installation is recommended.

5. Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) – Best Low Amp Tankless Water Heater – Shelf, Wall or Floor Mounted

Best Low Amp Tankless Water Heater

Bosch electric mini tank water heater tronic 3000 T ES4

Specification

  • Water Connection: 1/2“
  • Flow Rate (Max): 6.8 gallons
  • Water Pressure PSI (Max): 150
  • Temperature (Max): 145 °F
  • Temperature (Min): 65°F
  • Depth (inch): 13.75”
  • Height (inch): 13.75”
  • Width: 13.75”
  • Weight: 17.3 pounds
  • Installation place: Indoor only.
  • Fuel Type: Electric.
  • Recirculation: No
  • Voltage: 120V
  • AMP: 12A
  • Efficiency: 98%
  • CSA Approved: Yes
  • Warranty on unit: 6 years

Though in the title there mentioned it as a mini-tank water heater, you can use it as a tankless water heater and the amp of the tank is low only 12A.

Bosch Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) could supply two sinks as point-of-use at a time. the thermal efficiency of the heater is 98%.

For safety, the manufacturer provides a temperature/pressure relief valve. For long-lasting, they used a premium glass-line and it is easy to maintain. The installation procedure is also easy, you can install it on the floor or wall.

Pros

  • Long-lasting quality.
  • CFC-Free.
  • Easy to maintain.
  • Three different uses.
  • On-demand endless water supply.
  • Independent installation.

Cons

  • It could be leaked.

Read More: Tankless Water Heater for Tub

Buying Guide

Installation place: Most tankless water heaters are used for the sink, shower, or tub to supply hot water. For this, usually, they are installed indoors and the manufacturer mentions where you can install them. Some tankless water heaters were installed outdoor also.

Fuel Type: Tankless water heater can operate with electricity, gas, or both.

Flow Rate: It is one of the most important parts of a tankless water heater how many gallons could supply it.

Connection Size: For the tankless water heater you need to connect it with the water and gas line.

How we select these products

Our expert team analyzed a huge amount of user reviews. After that, they also technically check these products. After all the research, they make the list where every tankless water heater performance is high and the users are satisfied with these tools and also they recommend these low amp tankless water heaters.

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