The Best Value Tankless Water Heater For 2023

Sandra Espinet By, Sandra Espinet
Rinnai V75iN Tankless Water Heater
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1. Best Overall: Rinnai V75iN Tankless Water Heater

It's small, only the size of a small suitcase, so it fits in a wide variety of spaces. No more wiring, no more problems with installation. This easy-to-install energy efficient home heating appliance also eliminates the risk of gas leaks or carbon monoxide poisoning as there is no combustion and no hot water to mix with it. Read Review

2. Best Bang For The Buck: Stiebel Eltron 239223 Tankless Water Heater

The Stiebel Eltron active On Demand Tankless Water Heater is the perfect addition to your modern home. It provides a continuous and unlimited supply of hot water, saving space and no venting required. With a sleek design and thermodynamic heating, you'll never run out of hot water again. Read Review

3. Best Durable: EcoSmart ECO 11 Electric Tankless Water Heater

This tankless water heater provides consistent hot water when you need it without the hassle of waiting for a tank to fill up. It continuously monitors the temperature and flow rates to ensure efficiency, and provides a 99% thermal energy-efficient system. Read Review

4. Best Reliable: Rheem Tankless Electric Water Heater

It offers a fully automatic, self-modulating, self-regulating and quick installation process. This tankless water heater features an advanced digital temperature display to make sure water is always hot. Plus, you can easily switch out burned out parts for new ones in less than 30 minutes. Read Review

5. Best Compatible: CAMPLUX ENJOY OUTDOOR LIFE Tankless Water Heater

With CAMPLUX ENJOY OUTDOOR LIFE propane on demand water heater, you will never have to worry about low or no water pressure, as it uses standard 1/2" NPT gas fittings and has a trendy and modern design with unique white glassy front panel that is easy to control the temperature with LED touchscreen. Read Review

The best value tankless water heater is one that provides the most bang for your buck. It will cost you a little more up front but you will save money in the long run. For those who aren’t familiar, a tankless water heater essentially heats and switches water on and off via a small radiator built into the wall of your house.

This means there are no tanks to deal with or take care of, which makes them ideal for anyone who wants to have easy access to their hot water 24/7 (which is pretty much anyone nowadays).

Following extensive study and analysis, We think the best value tankless water heater of 2023 is Rinnai V75iN Tankless Water Heater. It's small, only the size of a small suitcase, so it fits in a wide variety of spaces,  energy efficient home heating appliance. However, it is not the only thing on our list. We also show a full buyer's guide and a number of different options are available to help you find the most suitable.

Our Top Picks

TOP Choice #1 Rinnai V75iN Tankless Water Heater
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Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician

Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 7.5 GPM (5 fixtures at once)

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE180iN model

Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

TOP Choice #2 Stiebel Eltron 239223 Tankless Water Heater
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Stiebel Eltron

Requires hard-wired 240 or 208-volt electric service, with a maximum draw of 28,800 watts at 240 volts or 21,600 watts at 208 volts

Requires 3 separate dedicated 40 amp breakers with 8 gauge copper wiring, and a minimum of 200 amp total service to the residence

On demand a continuous and unlimited supply of hot water

Sleek design saves space and no venting required

TOP Choice #3 EcoSmart ECO 11 Electric Tankless Water Heater
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Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature

Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches

Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.

EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution

Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM

Simple installation – bottom 3/4 inch NPT water connections

Threaded for easy replacement, simple installation, digital temperature display

External digital thermostatic control with LED display (+/1 degree accuracy)

Most advanced self-modulation, adjust power to meet hot water demand

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6-In-1 Protection Ensure Your Safety- Dry combustion,flame failure device, anti-freezing protection, over heating protection to ensure your safety. Fully automatic temperature controls with an energy saving mode and child lock technology.

Modern Design,Easy Operation -The indoor tankless water heater has trendy and modern design with unique white glassy front panel easy to control the water temperature with LED touchscreen (Fahrenheit and Celsius switch optional).The compact size propane tankless heater saves more space than traditional tanks.

Outstanding Features- The Camplux propane instant hot water heater comes with oxgen-free copper heat exchanger and v-type stainless steel burner,high heating efficiency up to 89.98 %; 90°wind isolation design, this tankless propane water heater can anti backflow wind in high floors, the S/S 2.36 ” vent pipe exhaust harmful gases quickly.

Note- The standby electric power of the product is 2W, and the working electric power of the product is 42W. Propane gas input pressure is 0.4psi. There is a pressure relief valve at the water inlet of water heater. It is necessary to manually unscrew the pressure relief valve to drain the water inside the machine in time after using the machine to avoid freezing and blew up when the temperature is lower than 32 ° F in winter .

3.18 GPM Instant Constant Water Heater -Camplux 3.18 GPM propane tankless water heater delivers 3.18 gallons per minute of on-demand endless hot water ensures constant comfortable instant hot water for 2-3 persons whole house. 3.18-GPM heater is activated by water flow rather than water pressure; Minimum activation water capacity rate: 0.65 GPM-4.8 GPM; Maximum input rating: 82,000 BTUs; Water connection location/size: Bottom/0.5-inch NPT.

Easy Installation -The propane on demand water heater uses standard 1/2" NPT water fitting and gas inlet. The gas water heater comes with 2.3" horizontal vent pipe for convenient and quick installation,great for whole home,small cabins and remote apartments use. You can take S/S wall thimble-WT236 for perfect indoor use. You will need a gas regulator ( Camplux model KR-106A )& 1 pc 5/8" NPT male to 1/2" BSP female gas connector adapter if you want to hook this water heater up to a propane tank.

6 Rheem RTEX-24 Tankless Water Heater
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On demand, consistent and continuous hot water

Self-modulating power control

Bottom 3/4" NPT water connections

24kW Model Flow Rate: up to 5.9 GPM for RTEX-24

ON/OFF Dial Control with adjustable digital temperature display

☼ Endless Hot Water: Imagine you are the last one in your family to take a shower before heading out for the day. You turn on the faucet and the water is freezing cold. Too bad you don’t have an Airthereal Electric Tankless Water to provide endless hot water on demand with no preheating, temperature fluctuations, or running out of hot water in the tank.

☼ Important Note: In order to install 18kW Electric Tankless Water Heater it requires 240 Voltage, 2 x 40 AMP Circuit Breaker Size and a set of 2 x (8AWG/2) wires. Please check to confirm that your breaker panel meet these specifications.

☼ Safe To Use: With high temp protection, dry heating protection, and electrical leakage protection you can rest easily knowing you have safe, on-demand hot water to use on your schedule. The electric and fluid systems are completely separated to prevent electric leakage and water pipe corrosion.

☼ Save Energy: Water is only heated when you need it, not stored in a hot water tank. The self-modulating temperature technology only uses energy to heat up water while you are using it to save up to 50% on water heating costs compared to a typical tank water heater.

☼ Save Space: That water heater in the basement or utility closet takes up a ton of space. This wall-mounted water heater uses 90% less space than a traditional hot water heater with a tank.

8 Runnatal Tankless Water Heater
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【Tankless Instant Hot Water Heater】No need to preheat before using the tankless water heater. As soon as you turn on the tap, the water flows with your desired temperature.

【Multiple Security Protection】The natural gas water heater is upgraded with 12 protection methods to ensure your safety. Such as dry burning protection, over 65℃(149 °F) protection, leakage protection, etc.Note: In cold weather, if the water heater is not used for a long time, it is necessary to open the pressure relief valve to drain the residual water in the water heater to prevent the exchanger or water pipe from freezing and swelling.

Note: Please download and read the installation manual and product manual carefully when purchasing the product to ensure that your installation environment is consistent with this product. When installing, please strictly follow the installation manual and installation instruction video, otherwise it may not work. If you have any questions about the product, please contact us by email. We have a professional technical support team.

【Quality Material】Made with brushed stainless steel material, the natural gas water heater has the function of high temperature resistance, corrosion resistance. Built-in oxygen-free copper water tank, long service time.Note: This product must be installed with a ventilation and smoke exhaust pipe for normal use.

【Energy and Money Saving】The hot water heater adjusts power input based on flow rate and temp setting in real time. Summer/winter 2 modes to save up to 60% on your natural gas costs.

NOTE: This product does not have a serial number. If you don't know how to install a water heater at all, it is recommended not to buy it.

【High Sensitive Touch Led Display】Comes with smart digital LED display high-definition large screen, freely adjustable the temperature between 30℃-65℃.

9 BLACK+DECKER Electric Tankless Water Heater
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WARRANTY: 7-yr leakage free, 5-yr heat exchanger, 2-yr parts

Save up to 50% on your water heating costs

On demand hotwater heater for up to 2 single use applications

Electric Water Heater with no hot water tank

10 Stiebel Eltron Tankless Water Heater
Our Score:
Stiebel Eltron

TEMPRA 20 TREND – This specific model is 19.2kW, 240V, requires a min recommended electric service of 125 A, and offers an output water temperature of 68° to 140°F. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels

CONTINOUS FLOW – Hot showers will never be interrupted again. Enjoy continuous, on-demand hot water with an unlimited supply, when you want it without wasting any energy when not needed

SPACE & ENERGY SAVER – Its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required. Eco friendly unit saves energy with auto-modulation

WARRANTIES INCLUDED – Stiebel Eltron’s top-rated electric tankless water heaters perform with the highest standards for comfort and reliability. Our 7-Year Leakage and 3-Year Parts Warranties are included with purchase

SILENT OPERATION – One electronic switch will activate the hot water heater and it’s noise free while in use. Digital temperature display is easy to read, while the interior solid copper heating system does all the power work

Product Images, Product Titles, Product Highlights from Amazon Product Advertising API

What to Look For in a best value tankless water heater?

Upon looking for the perfect best value tankless water heater, a lot of things should be taken into account. Each item has its own challenge of purchasing.  As a result of the formation, we're here to help, advise, and provide answers to these problems.

Please keep in mind the following points to select best value tankless water heater that fit you most:

Digital Displays

Modern water heaters have digital controls, which allow homeowners to set up the heater to turn off when they are away from home. Although a digital display can increase the initial price of the heater, it also increases the heat efficiency, which ultimately saves money.


A lowboy, or shorter water heater might be the best option if you don't have a lot to heat. They are smaller than average and can be used in small homes. You could also consider mini-tank or tankless water heaters. Although gas water heaters are bulky and heavy, it's possible to get smaller models. The size of electric water heaters is generally smaller. If you have limited space, tankless electric water heaters will be the most suitable option.

Tankless Or Tank

A tank water heater stores a set amount of hot water and is ready to be sent to several appliances simultaneously. The tankless heaters heat the water quickly and require less space than water heaters with tanks. One unit might not heat enough water for multiple fixtures simultaneously, so it is possible to purchase multiple water heaters.

Venting Needs

Electric water heaters do not require venting, so they can be placed in any place in your home. When they heat up, gas hot water heaters emit carbon monoxide and other harmful gases. These heaters use a ventilation system made up of pipes and conduits that removes these byproducts. Gas heaters require venting, take up more space, and are less suitable for homes than electric water heaters.

Gas Or Electric

There are many factors that influence the choice of electric or gas-powered water heaters. These include local utility costs and personal preferences. People who want to save money upfront and those who don't have natural gas in their homes prefer electric water heaters. Gas heaters can be more costly upfront, but they will save you many hundreds of dollars per year depending on the energy cost in your region.

Anti-Scale Devices

Some companies advertise that they can reduce mineral scale buildup by swirling water. Although scale may reduce the heater's life expectancy, it doesn't mean you have to spend a lot on fancy options. Look for one that comes with a 122023 warranty. This usually includes an element of a greater or lesser thickness.

Tank Capacity

You should make sure your tank heater has enough hot water storage to provide heat for your entire family. Although tank heaters are capable of heating water at multiple locations simultaneously, they will require more time to heat the water. This could lead to unexpectedly cold showers.

Brass Vs. Plastic Drain Valves

A tank water heater has a drain valve located at the bottom that allows for the proper drainage of the tank. The valves can be used with standard garden hoses and made from brass or polyvinyl chloride (PVC). A brass drain valve is better than using plastic for hot water heaters, as brass is more resilient than plastic.

Efficiency Rating

Efficiency ratings are a measure of how efficient water heaters actually heat water. An efficiency rating of.70 for hot water heaters means that 70% of energy used by them heat water.
The difference between electricity and gas rates means that this rating doesn't give a good indication of the cost you could expect to pay for the unit. A gas heater with a lower efficiency rating will be more efficient than one that uses electricity. However, gas heaters are mucher than electric ones.
Because they don't have to run constantly to heat water, tankless heaters are significantlyer than storage tanks heaters. A tankless water heater can cut down on your energy bills by up to 40% depending on how much hot water you use. To determine the impact on your budget, it is better to calculate the annual operating cost for the hot water heater.


What is a tankless water heater?

A tankless water heater is a type of water heater that heats water on demand as it passes through the unit, rather than heating and storing a large volume of water in a tank like a traditional water heater.

What are the benefits of a tankless water heater?

Tankless water heaters are more energy-efficient and provide a continuous supply of hot water, which can save you money on your energy bills. They are also much smaller than traditional water heaters, making them easier to install and maintain.

How long can I expect a tankless water heater to last?

Tankless water heaters are designed to be energy efficient and long-lasting. Generally, you can expect your tankless water heater to last for up to 20 years when it is maintained properly.

What are some common features of tankless water heaters?

Tankless water heaters typically come with a range of features, such as temperature control, digital displays, and safety shut-offs. Some units come with additional features such as recirculation pumps or freeze protection.

The list of best value tankless water heater will be regularly updated to be included in additional data by our editor's team. Please keep an eye around for any amendments made to our website.

Our consultants could support you with problems related to best value tankless water heater and other things as well. Please do not hesitate to contact us should you need advice.

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About Sandra Espinet

Sandra Espinet
Sandra Espinet is an editor and freelance writer who loves nothing more than helping others polish their work to perfection. She has a keen eye for detail and a passion for home decorating, which she enjoys sharing with her readers. When she's not editing or writing, Sandra can be found spending time with her family or exploring the great outdoors.

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