Top 7 Best cheap tankless water heaters 2021 Reviews and Guide

Explore without worrying.

A water heater is an essential electrical appliance for each family. However, the different functions and flow rates of migrants affect prices, making some of them un-affordable while others are still economically viable. To sum up, we aim to find the best cheap tankless water heaters 2021.

In a Rush? Here is Our Top Choice

Premium Choice

ECOSmart ECO 18

ECOSmart ECO 18

18 KW at 240 Volts with Patented Self Modulating Technology

About this item

  • 8.8 GPM
  • 0.95 Energy Factor Rating
  • Electric, Indoor

Best Overall

EcoSmart ECO 11

EcoSmart ECO 11

13KW at 240 Volts with Patented Self Modulating Technology

About this item

  • 3.2 GPM
  • 0.98 Energy Factor Rating
  • Electric, Indoor

Budget Pick

Stiebel Eltron DHC

Stiebel Eltron DHC

4-3 Point of Use
Tankless Electric Water Heater, 277-volt

About this item

  • 1.2 GPM
  • Electric , Whole House
  • 0.94 Energy Factor Rating

Best Cheap Tankless Water Heaters 2021


It’s very simple that the best cheap tankless water heaters 2021 have a heater in them. Consequently, these heaters work on electricity, propane, or natural gas and use that to heat up any liquid they use to heat coils or radiant heat, but sometimes quartz crystals and other esoteric alternatives.

Top 7 Best Cheap Tankless Water Heaters 2021

best cheap tankless water heaters

1: Eccotemp tankless water heater (Best Overall)

The Eccotemp L 10 2.6 GPM best cheap tankless water heaters 2021 have innovative, revolutionary features, value making. So, this model is ideal for vacation cabinets, kitchen sinks, and house use. Similarly, The L 10 only pumps at 2 watts while at idle and 1.07 Amps at runtime, making it a very efficient electric motor.


Modern Design

The most important thing which is to be set in this model of Eccotemp is that it’s a sleek and modern design that is different from the other heaters and makes it more beautiful in shape than the other ones. best cheap tankless water heaters 2021 reviews

Efficient in working

Accordingly, this model is also working very efficiently and always shows good results during the heating of water and other timber material in different stages. In conclusion, the glass panel is set in front of this model, which makes it work more powerfully in dual side functions.

Liquid Propane Powered

However, the Eccotemp L10 has powered liquid propane and an internal model designed for the production of mid-range hot water where you need a lot of warm water at the same time.

Overall Performance

The overall performance of this model is always pleased and good enough to work very accurately. Similarly, the steel vent kit is included in this model which is stainless. As usual, the overall performance is efficient. Nevertheless, an excellent and huge power motor is beneficial for working.

  • Solid heater
  • Sleek and works great
  • Decent look
  • Propane on-demand hot water
  • Digital temperature control
  • No extension

2: Titan electric tankless water heater (Best Efficient)

best cheap tankless water heaters


The Titan best tankless water heaters is ideal for those with medium or low capacity who are looking for a compact heater option. Similarly, this water heater is only about 7 x 10 x 2.75 centimeters. Additionally, it also has an analog temperature controller but does not provide a numerical value.

Easily Mounted Anywhere

In addition, the unit can be installed easily anywhere but requires a discount of 60 amps because it draws 54 amps. However, it can consume a lot of power at 11.8kW at 240 volts, but it also has hypnotic technology. That means that a water heater will use that much energy when it needs to do so.

High Temperature

Titan has a freshwater heater. Accordingly, the Titan will replace the standard tank heater without interrupting your comfort. Moreover, Titan is recommended for warmer climates where the ambient water temperature is above 65 degrees (F).


Subsequently, this heater from the Titan has a one-year warranty for electrical components, while the water components operate under warranty. Finally, it works well for most people may not be the best choice if you are located somewhere colder than average. This product is available in an affordable budget.

  • Compact water heater
  • Constant output temperature by adjusting the flow rate
  • Inexpensive and easier to use than many tankless water heaters on the market
  • Not useful in cold climates

3: Steibel Eltron Tankless Water Heater (Best Powerful)

best cheap tankless water heater

The smaller Stebel Eltron is manufactured in Germany. They are designed to put hot water where you need it to be used quickly, smoothly, and save water. It is also a European, attractive design that includes any decorations to be revealed to look or be hidden under the kitchen.

Sleek Design

Steibel has set the new model of the best cheap tankless water heater brand, which is excellent, lightweight. Just as, this model is sturdy in its shape and sleek design. Similarly, this model is designed for under sink hard wiring, horizontal installation.

Without Venting

Besides, Steibel is put into the work area and only works when hot water is requested, thus dramatically reducing hot water delivery time and inefficient electricity consumption. To sum up, this model has no venting system.

Inlet and Outlet Connection

Steibel has a 0.5 GPM flow rate and 3/8-Inch cold water inlet and outlet connections. In some way, this model was the first to release a microprocessor technology that allows pre-set or controlled heating to deliver unlimited hot water without the risk of scarring in two seconds as opposed to the six seconds provided by other waterproof burners.

  • Easy to install
  • Low price
  • Working great
  • Bit heavy

4: Camplux Tankless Water Heater (Best Budget)

Camplux 5L 1.32 GPM Outdoor Portable Propane

Camplux heater without water heater is designed for the production of small and medium-scale water group, is ideal for indoor use, apartment, free of clutter in smaller towns and villages. On the whole, this model is available on the market price of this brand.

Modern Design

The unique digital temperature display makes it easy to read the temperature. Besides, features are the compact design and space-saving with minimal noise output. Finally, this water heater is ever made which stopping the new and most advanced security systems to ensure your safety.

Save More Energy

The Eco and Full gas switch, rated at 2.64 GPM only work when used, which saves a lot of energy. Subsequently, Camplux has flame protection, snow-resistant protection, over-protection, air-pressure adjustment protection to ensure safety.

Controls Water Temperature

It uses standard 1/2 “NPT water gauges and is easily installed using powerful water temperature controls. Similarly, with water pressure setting is PSI capacity emits 68,000btu / hour.

  • Compact shape, wonderful for camping shower
  • Two-button settings for water temperature adjustment
  • Endless hot water supply
  • Light-weighted
  • Unbeatable cheap price
  • Temperature control with gas and water flow

5: EcoSmart ECO 18 Electric Tankless Water Heater, (Heavy Duty)

EcoSmart ECO 18 Electric

The EccSmart ECO 18 best Tankless Water has been very efficient using a conventional flame-retardant flame immediately passing through the exchange heater. Similarly, this product is the best cheap tankless water heater and this brand is available on Costco shipping.

Digital Temperature Display

It is easy to read the digital temperature indicator, in a compact design, and to create space with minimal noise output. In addition, this product is an indoor installation with safe ventilation, efficient, and convenient for any small home, wardrobe, or apartment.

Electronic Ignition System

Moreover, a safe electric, disposal system; plugs into a standard 240v power outlet with UL installed cable. It uses standard 1/2 “NPT water installations. Finally, it has a minimum 0.65 GPM flow rate.

Horizontal Vent Kit

Consequently, with a Horizontal Vent Kit installed, this EcoSmart Tankless Water heater is ready for indoor use right in the box. Finally, it is perfect for cabinets and small homes, so you don’t carry your budget for a hot shower.

  • Fantastic in freezing weather
  • Amazing and great performance
  • Manual temperature control
  • Horizontal vent kit
  • Perfect for only one house

6: SIO Green Tankless Electric Water Heater (Best Performance)

SIO Green Tankless Electric Water Heater

Consequently, our electric hot water heater includes the Automatic Power Technology and Model Manual. Similarly, hold down the power button to switch between Auto Mode and Manu. Also, you can easily adjust the temperature using the Water Flow Regulator packaged.

Hot Water Anytime

Accordingly, Sio Green’s best premium mini-tank waterproof heater point to use is here to help you enjoy your hot water or wash dishes with warm water anytime you want without any fuss.

Touch System

A small heater tank heater saves you up to 60% on heating water costs. However, waterproof construction allows you to easily and safely control the temperature through our effective water contact settings.

Patented Technology

Our waterproof electric heater will create heat without any direct contact with metals, which will prevent corrosion, and calcium buildup. As a result, you will have to spend $ zero on maintenance, No replacement parts, No filters needed.

  • Temperature Control
  • High efficient
  • Save your money
  • Latest technology
  • Economical

7: Rheem Residential Tankless Water Heater (Long-Lasting)

Rheem Residential Tankless water heater

Consequently, Rheem 240 V 2 users rank it is one of the best cheap tankless water heater on the market. This is because this unit has a very high flow rate of 4.4 GPM. Finally, this also shows that this heater can heat a lot of water and can work with any type of shower.

LED Display

In addition, the 240V model of Rheem has a digital temperature control system with the display of LED (+/1 degree accuracy). Similarly, this model included 99.8% energy efficiency.

Easy to Install and use

Furnished for easy replacement, easy installation, and digital heat display 54 A. 13kW Model Flow Rate: up to 3.17 GPM. Similarly, Rheem gives durable copper two-way heating element and serviceable.

Lightweight Design  

Rheem has set the new model of best tankless water heater brands, which is excellent, lightweight, and most sturdy in the shape and design. To sum up, the sliding and heating adaptability in the model of water heater is so helpful for the easy to use.

  • You get a digital remote control with this purchase
  • 94% energy efficient. Consumes less gas
  • Comes with 10 feet of thermostat wire
  • No temperature or water display

8: Rinnai tankless water heater (Efficient for work)

Rinnai V65iN High-Efficiency

The RL94IN is the perfect combination of high efficiency, comfort, and valuable heater. In any case, best tankless water heater for family and natural gas heater from Rinnai. Moreover, this model is ideal for a small home to medium-sized homes or herbs, compact, easy to install, reliable, and suitable for interior areas. Finally, Rinnai products provide peace of mind with a warranty that exceeds the competition.

Included Technology

A tankless natural gas heater uses renewable technology, delivers more efficiency, and reduces unnecessary heat loss. Also, save a lot of money from electricity and energy bills. Additionally, it also creates a sense of eco-friendly spending.

Save Valuable Space

Your water heater shouldn’t be a behemoth! The compact design allows installation in non-traditional areas such as an attic, crawl space, or blanket. Save 16 sq. Similarly, space is a Rinnai heater waterless tank only the size of a small suitcase.

Affordable and Efficient Saving

The efficiency included in the design of the tank means cutting out CO2 emissions (compared to the tanks), using less energy and saving water. Use 40% less energy than traditional tanks because you only heat water when you need it.

Stable Temperature of Water

The large flow rate of the heater enables it to support the hot water of several pots and cracks simultaneously, meeting the family big house needs for 4 or more uses. No matter how many devices run at the same time, the water temperature remains constant. Also, the whole operating system is very quiet and no loud noise can be heard being used.

  • Easy to install
  • Dependable Tankless unit
  • Take about 30 seconds
  • Temperature control
  • Bit Expensive

9: EcoSmart ECO 11 Electric Tankless Water Heater (Best Economical)

EcoSmart ECO 11 Electric

EcoSmart ECO 11 is a great model of the best tankless water heater brands. For this item, we have US stock and will ship directly from the US. It only takes 2-5 days for shipping. In fact, a small, fast daytime hot heater is ideal for a kitchen-living room. It also used in the other areas that you are forcibly searching for. Because of its small space features, strong use, and easy installation.

Automatic temperature control  

Consequently, the temperature is adjusted between 55 ℃ -75 ℃. The power is turned off automatically when the temperature is reached. As well, directly heat the system with high efficiency and low heat tube capacity, which you can use very thermal energy.

Lightweight Heater

Additionally, an electric heater works without the cost of electricity. Without radiation, outside pollution, gas generating. The lightweight heater is the perfect combination of indoor quality and a stylish look. Hence, this heater works for many different family needs. It is healthy for your family.

Water Pressure

Accordingly, it applies to different water pressures of different locations. Especially for those families which are located in high-rise flats with low water pressure. In the same way, water temperature is equal to fluctuations in flow rate. It is ideal for hand washing, face, dinner, vegetables, fruits, and table during winter or cold weather.

Easy to Use

It is a kind of extra heat with high efficiency and low thermal energy, which can benefit from very high thermal energy. Subsequently, the temperature is adjustable and power is turned off automatically when the set temperature is reached.

High power

In spite of this, the total power of this product is 1500w and has many input modes. It also applies to different water pressures of different locations. Especially for those families which are located in high-rise flats with low water pressure.

  • Space-saving design
  • Endless hot water
  • Aesthetic design
  • Easy to adjust the temperature
  • Multiple installation methods
  • Bit expensive

Frequently Asked Questions( FAQs )

1: Do tankless water heaters work in cold climates?

Tankless product is working in a cold environment. However, there are a few things to keep in mind. Cold weather means cold temperatures below the surface, leading to the need for more water to heat your desired temperature.

2: What will be the suitable size of the best cheap tankless water heater?

The size of a waterproofing helicopter is largely dependent on the repair of the pipes and equipment used for housing. Also, it depends on the temperature of the groundwater somewhere.

3: Do tankless water heaters work in cold climates?

Tankless product is working in a cold environment. However, there are a few things to keep in mind. Cold weather means cold temperatures below the surface, leading to the need for more water to heat your desired temperature.

4: How can we install the tankless water heater?

Technicians should know about discharge, pipelines, electricity, and gas. In the case of a licensed technician, the product warranty would not apply and would be void.


We hope this list helps you downgrade the type of heater you want, or even point to a model that suits your specific needs. Your success in any of these options will depend on the needs of each home.


If you have the best cheap tankless water heaters in 2021 without electricity, then try to find the one that is right for you. From our top picks, you can get some ideas about the best cheap tankless water heater.