Best Tankless Water Heater Reviews

In A Rush? Here’s our top choice…

  • External adjustable digital thermostatic control with LED display (+/1 degree accuracy
  • Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
  • Simple installation – 3 foot electric cable and 1/2 NPT adapters included; side 1/2 inch Compression water connections
  • check
    99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
  • check
    Threaded for easy replacement, simple installation, digital temperature display

The Rheem RTEX-13 240V Heating Chamber Residential Tankless Water Heater is equipped with two copper immersion heating elements that are both durable and serviceable in the field when they need to be replaced.

An adjustable digital thermostat can control temperature to within a degree of your setting, so you will have complete control over your water temperature.

This unit will self modulate so you use even less energy to get quality water heating.

If you want a tankless water heater for your small application like a boat or RV, the PrecisionTemp RV-550 Tankless Water Heater (Check Price on may be the choice for you.

This compact unit takes up a miniscule space and uses hardly any propane to power as much hot water as a light hot water user will need.

twkimagwTankless water heaters are rapidly gaining popularity, despite often being more expensive than the classic tank water heaters.

This is because tankless water heaters conserve energy and end up costing less over their lifetime, as well as providing hot water on demand. Say goodbye to cold showers with an efficient and powerful tankless water heater.

Rheem is famous for high quality temperature control. The Rheem RTEX-13 240V Heating Chamber Residential Tankless Water Heater is easy to install and program and can transform your experience with hot water in your home. Find out more about heating products here

How to Pick The Right Option For Your Needs?

The decision to buy a tankless water heater should not be made lightly, since these units do not come cheap. If you buy a unit that is not powerful enough for your needs, you will experience unpleasant cold patches during your showers.

Do you want one that will be housed indoors or outdoors?

If outdoors, be sure that the unit has freeze protection if you live in a colder climate. If indoors, be sure you take the venting needs of the unit into mind, as well as mounting possibilities.

These heaters can be powered by electricity, propane, or natural gas. Some have variable power sources for versatile use.

Decide what power source you would like to use and determine whether you will be able to install yourself or require professional installation.

Water heaters have either a stainless steel, copper, or infrared heating element. Stainless steel and copper both have variable durability depending on quality, but most will need to be replaced at some point, since the metal always is in contact with the water.

Infrared, on the other hand, does not come into contact with the water and may require less maintenance. 

By Purpose

Top Option

The Rheem RTEX-13 240V Heating Chamber Residential Tankless Water Heater has an external adjustable digital thermostatic control that maintains temperature to within one degree, for precise control over your hot water.

The two copper immersion heating elements are durable and field serviceable when they do need work.

Self-modulating power control enables greater efficiency and temperature control than competition.

This unit is easy to install, with a three foot electric cable and ½ NPT adaptors and compression water connections included.

Replacement is easy with the threaded design and simple installation. A digital temperature display is clear and easy to read and program in any lighting.

Top Commercial Option

The Takagi T-M50 ASMENG Heavy-Duty ASME Certified Commercial Natural Gas Tankless Water Heater, 14.5-Gallon Per Minute offers extraordinary heating capacity for commercial applications.

This unit provides endless hot water on demand, so you will have enough water whenever you need it and not waste energy heating it unnecessarily.

The compact design of this product saves space in tightly packed commercial spaces.

Safety features are computerized so no one will have to worry about checking on it in your workplace. There is no pilot light either, making this unit safer.

This unit modulates depending on need, and is perfect for heavy duty use.

Top Gas Option

The Rinnai V65IN 6.6 GPM Indoor Low NOx Tankless Natural Gas Water Heater integrates effortlessly into your natural-gas run home.

It is Energy Star certified so you can feel completely confident about saving money and energy.

This unit features Homes Leak detection so water will shut off in case of a leak, preventing property damage.

Scale detection is enhanced to prevent serious damage to the unit, even if you don’t know you have hard water.

There is a temperature lock feature so that the water temperature won’t be changed accidentally or without your knowledge. Temperature can be chosen between 98°F and 140°F.

There is a year warranty on the heat exchanger, a five-year warranty on parts, and a year warranty on labor, so your mind will be at ease as you make the decision to purchase this unit.

Top Condensing Option

The Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute provides endless hot water on demand.

This model is small and compact enough to fit almost anywhere in your home or small business, and complies with ultra-low NOx regulation so you can feel good about installing it in your space.

It uses a commercial grade copper alloy for heat exchange tubing, so it is durable and long lasting.

This powerful unit can power up to four showers in warmer climates or three showers in cooler climates. It is tough enough for heavy residential uses like space heating or domestic recirculation.

A 15-year limited warranty on the heat exchanger and five-year limited warranty on parts can put your mind to rest about this purchase decision.

If desired you can easily link up to four units without a multi-unit controller or up to 20 units with one.

Troubleshooting diagnostic codes make maintenance a breeze and safety features including freeze, overheat, and surge protection give you confidence in using this unit even without supervision.

Top Propane Option

This Tankless Gas Water Heater (Low Pressure Startup) 1.6 GPM LPG Vent-free (Propane) gives you great water heating for a reasonable price.

There is no need for a pressurized pump with this system, since it runs with only 2 PSI of water pressure. This unit features exclusive vent free technology that does not require an expensive Flue.

A pure copper heat exchanger is made for durability and is backed by a lifetime warranty.

This unit comes with a convenient LPG flare brass adaptor for the gas regulator, at no additional cost to you.

This is an excellent, affordable unit for an RV, hunting cabin, boat, or anywhere else you want comfortable hot water easily and conveniently. Because this system is vent-free, you won’t have to worry about where you install this unit inside.

If this heater is deprived of oxygen it will automatically shut off.

This is a good model for light use, with the capacity to be hooked up to up to 2 ½ baths, although no two baths should be used simultaneously.

Top RV Option

The PrecisionTemp RV-550 Tankless Water Heater – Wall Vented was designed with small, mobile applications in mind. It is made to be used with RVs, trailers, tiny homes, mobile washing services, etc.

This low profile unit takes up a half the space and weighs a third of a 10 gallon traditional water heater. This makes a big difference in small spaces, especially when weight is a consideration.

This unit has no pilot light, for safer operation. It is extremely efficient. You will be amazed by how little propane it takes to power this system.

This unit self adjusts gas usage based on variations in water flow and incoming water temperatures.

VariFlame is reliable and proven technology that keeps heat consistent in this system. You can feel good about buying this unit since it was designed, assembled, and tested in the USA.

Top Outdoor Option

The Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater, Natural Gas is a great little unit that can be installed out of the way, outdoors.

Internal freeze protection means you don’t have to worry about this product being outside no matter how cold it gets.

This unit is great for homes with up to two bathrooms in warmer climates or one bathroom in cooler climates.

Versatile functionality enables you to use this unit in residential settings, radiant floor systems, storage tanks, etc.

A fifteen-year warranty on the heat exchanger and a five-year limited warranty on parts can help to put your mind to rest about this purchase decision.

A remote control is included as a standard feature for temperature control convenience. Troubleshooting diagnostic codes make maintenance a breeze.

There are great safety features included with this unit as well, including freeze, overheat, and surge protection.

By Brands


Rheem is a well-known name in heating and cooling. The Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater has 94 percent energy efficiency, so you can feel assured that your money and energy are being put to good use.

A stainless-steel heat exchanger is durable and efficient. This unit is intelligently made with electronic controls that are designed to increase energy efficiency as well as safety.

You can connect up to 38 feet of three inch pipe or five feet of two inch pipe, for versatile installation options.

This innovative system has self-diagnosis, making installation as well as servicing a breeze. Guardian overheat film wrap increases the safety of this unit.

If you want to connect more units to operate as one for larger operations you can connect up to six units with an optional Manifold.

A digital remote control makes controlling this unit effortless.


The Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas has a powerful 140,000 BTUs, to heat water efficiently and rapidly. A flow rate of 6.6 GPM flow rate provides plenty of water as you need it.

There are thermostats on the inlet and the outlet, for constant temperature monitoring. You can use this as a straightforward tankless water heater or a direct vent unit.

This is an ideal natural gas unit for light residential uses, as well as for radiant heating applications.

An energy star rating can make you feel confident about the capacity of this unit to save energy.

You can feel secure in your decision to spend hard-earned money on this model, due to the 10-year heat exchanger and 5-year parts warranty.

For those with hard water, a scale inhibitor can easily be installed in a replaceable cartridge.

EcoSmart Eco

The EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology heats more water than any other product on the market that is equipped with self modulating technology.

In cold weather this powerful machine can produce three gallons per minute, allowing you to run up to two showers at a time while it is snowing outside.

In warm weather six gallons per minute of hot water can run up to four showers and a sink simultaneously, for incredible hot water production.

A digital control sets temperature in increments of one degree from a mild 80°F to 140°F, for exact control of your desired temperature.


If you want more from your tankless water heater, the Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater, Concentric/Twin Pipe Installation might be the machine you are looking for.

Condensing technology delivers more efficiency than previously possible. This unit is 95% efficient, so you know that more of your energy, and therefore money, is going into heating water than ever before.

Power it witheither natural gas or propane, for hot water whether you have electricity or not.

Your mind will be at rest in this purchase decision with a limited 12-year warranty on the heat exchanger, five-year warranty on parts, and one-year or five-year optional warranty on labor.

Bradford White

The Bradford White TG-199I-X Pro Gas Tankless Water Heater will efficiently reduce your energy consumption, since it is Energy Star qualified.

A digital main controller has a temperature range between 96 and 120 degrees Fahrenheit, so you can choose the exact temperature that is perfect for you.

Your mind will be at rest in this buying decision with the 12-year limited warranty on the heat exchanger.

The Everhot technology of this unit will ensure that you never run out of hot water again.


The Navien NPE240S-NG Premium Condensing Tankless Gas Water Heater Natural Gas utilizes ultra condensing technology to heat water efficiently using natural gas.

Two stainless steel heat exchangers work to consistently heat water with a durability that will last and last, resisting corrosion better than copper.

Condensing technology is the industry’s top rated most energy efficient, giving you more output for less money. They use less BTU input to give more output than traditional systems.

You can run two inch PVC for up to 60 feet, allowing for incredible versatility in setting up your heating system. Half inch pipes allow more options than traditional ¾ inch systems.

A negative pressure gas valve and a dual venturi system offer versatility whether you want to use propane or natural gas

Final Verdict


The Rheem RTEX-13 240V Heating Chamber Residential Tankless Water Heater is a great all around tankless water heater.

It offers precise control in a durable design. The likelihood of needing to replace the durable copper heating elements is considered by making them easily field serviceable.

This unit has self modulating control so it will use less energy to produce hot water on demand every time.

You can easily install this unit anywhere indoors without having to worry about venting. The digital display is extremely easy to read and program in any kind of lighting.