6 GPM Tankless Water Heaters – Best Electric and Natural Gas Compared

Looking for a nice water heater for your home? Look to no other than the 6 GPM tankless water heater. As its name implies, this heater lacks a tank as is the norm with the conventional tanks. Its rates of water flow are nonetheless higher and subsequently more effective.

What Is the Best 6 GPM Tankless Water Heater on the Market?

Comparing Best 6 GPM Tankless Water Heaters

Photo Title Price Buy
Rheem 18kW 240V...image Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater $405.90 Check Latest Price
Rheem RTEX-24 24kW...image Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray $549.52 Check Latest Price
Bosch Electric Mini-Tank...image Bosch Electric Mini-Tank Water Heater Tronic 3000 T 7-Gallon (ES8) $333.00 Check Latest Price
Ecosmart ECO 36...image Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater, White $376.91 Check Latest Price
Stiebel Eltron Tankless...image Stiebel Eltron Tankless Water Heater - Tempra 24 Plus $599.00 Check Latest Price
CAMPLUX Mini Tank...image CAMPLUX Mini Tank Electric Water Heater ME40 4.0 Gallons, Point of Use No Wait for Hot Water Under Kitchen Sink 120V 1440W, Wall or Floor Mounted, UL Listed $199.99 Check Latest Price

Is 6 GPM Natural Gas Tankless Water Heater Worth Buying?

YES, it is! Below are some of the benefits that accrue from the use of this water heater:

Best Natural Gas Tankless Water Heater

best outdoor 6gpm tankless water heater


  • 88.5% thermal efficiency
  • Maximum power output at 110,000btu/hour
  • CSA certified
  • High-quality rubber plastic water hose
  • Flame failure device
  • Anti-freezing protection and over-heat protection



Endless Supply of Hot Water

With this water heater, it is possible for you to enjoy an endless supply of hot water. Unlike the conventional tanks, it is not constrained by the amount of water in your tanks. This means you won’t have to suffer periodic losses of water.

Limited Space Requirement

We have already stated that this heater does not require any tank to operate. For this reason, it requires less space to mount and make do with. It is hence suitable for use in areas that are too squeezed to allow for use in areas that are cramped up and larger harder-to-reach.

Higher Rates of Water Discharge

Compared to the 5 gallons-per-minute, the 6 gallons-per-minute water heater discharges water at a rate that is slightly higher. On account of this, it is more thorough than your ordinary kind of heater. This makes it awesome for applications that require strong water.

Lower Energy Bills

Given that it heats water only when it is needed to, this kind of heater cuts down the levels of utility bills necessary for the job. With reduced energy bill comes the equally reduced expenses of operations. This is definitely good for long-term reliability.

High Efficiency Rheem RTEX – 18 Residential Tankless Water Heater

large power tankless water heater


  • LED display
  • Advanced self-modulation technology to regulate water power
  • Simple to install
  • High energy efficiency
  • Easy to operate
  • Small compact shape



Reduced Spates of Maintenance

Generally speaking, this kind of heater requires a limited spate of maintenance. It has relatively fewer parts and components than many alternative forms of heaters. With reduced spates of maintenance comes the added benefit of peace of mind.

Rheem High Quality Residential Tankless Water Heater with Less Maintenance

6gpm tankless water heater


  • External digital thermostatic control
  • LED display
  • Advanced self-modulation system to meet hot water demand
  • Durable copper immersion
  • Simple installation
  • Less maintenance required
  • 5.9 GPM flow rate



Unparalleled Energy Efficiency

A combination of smaller size, higher rates of water discharge and heating-on-demand combine to boost energy efficiency. Simply put: You get to put in less power while reaping big on the outcomes. The benefit of higher returns on investments hence awaits you.

Cheaper Installation

Like many other tankless water heaters, the 6 gallons-per-minute water heater is similarly cheaper to set up. This stems mainly from the fewer parts and components, smaller size and relatively ready-to-go makeup.

Longer Service Life

Considering that they require reduced spates of repairs and maintenance, these heaters deliver longer services. You have no better companion than these heaters if all you want is to receive a constant supply of hot water in the long run.

Saves Money

The combination of all the aforementioned benefits adds to one. It saves you money. You spend less yet receive a lot more benefits in return. Why would you want to place your bet elsewhere other than this money-saving device?

6 GPM Tankless Water Heater Gas vs. Electric

There are two main kinds of 6 GPM tankless water heaters. These are the electric and the gas heaters respectively. Which of these two is the better option? Only by looking deeper into their finer details can we be able to answer that. We compare and contrast them here below for your consideration:

Electric Mini Tank Water Heater

small tank water heater


  • 98% thermal efficiency
  • Can be installed horizontal or vertically
  • Constant hot water for home and office needs
  • Large power
  • Mini type to suit under sink or point of use
  • Can be wall-mounted or self-mounted



Fuel Source

The gas derives its power from the liquefied petroleum gas whereas the electric derives its heating power from the mains electricity. It hence goes that the former is useful in areas that are detached from the mainstream. The latter, however, is good for use in places that are connected to the national grid.

Installation Costs

These two appliances cost varying amounts of money to set up. Of the two, the gas is easier to install as it is mobile and requires no fixed installation processes. The electricity nonetheless is complicated and needs for hefty installation procedures to operationalize.

Costs of Acquisition

Other than the costs of installations, these appliances also attract different costs of acquisitions. Generally speaking, the gas heater is the cheaper of the two. This is mainly informed by the fact that its makeup is less complicated than that of the electric heaters.

Frequency of Service

How often do you intend to make do with the heater in question? If you want one for every day or regular use, the electric heater would be the most suitable. Choose a gas on the other hand for one time or limited applications.

Space Availability

Though both of them are tankless, they differ in size. The gas is the slimmer and more compact of the two. It is hence applicable for those spaces that are too squeezed for the ordinary tanks. The opposite applies to electric heaters. You have to set aside sufficient space to be able to contain them.

Compact Space Saving Ecosmart ECO 36 Electric Water Heater

ecosmart 6gpm electric tankless water heater


  • Sleek and modern look
  • 99.8% high energy efficient
  • Manufactured in USA
  • Digital temperature display
  • 36kw large power
  • Perfect for small house shower use



Desired Location of Use

Where exactly do you plan or want to devote your tankless heater to use? Is it indoors or outdoors? If yours is for outdoor use, the gas is the one you have to pick and use. Pick the electric for strictly indoor applications on the other hand.

What you should know about buying the best 6 GPM tankless water heater?

Before settling on a specific 6 GPM tankless water heater, there are certain issues you have to take care of. Below, we highlight and discuss those issues for your consideration:

Energy Efficiency

You have to consider the energy efficiency of the heater you choose. This measures the amount of energy it consumes versus the heating power it gives off. A good appliance ought to consume less but give out more. That is the only guarantee of long-term reliability.

Best Value Stiebel Eltron Tempra 24 Plus Electric On Demand Tankless Water Heater

indoor tankless water heater


  • Multiple powers and styles available
  • Continuous hot water supply
  • Easy to operate
  • Powerful solid copper interior heating system
  • Low working noise
  • Energy efficient




It is important that the heater you pick be backed by some excellent warranty and after-sale services. These appliances are prone to breakdowns as is the case with the many other pieces of equipment that are in existence at the moment. Warranties help to mitigate these effects.


Obviously, you have to factor the size of the equipment versus the space you have at your disposal. The best equipment has to be able to fit the space you have in mind. This also means the equipment has to be appropriately configured for the said space.

Mini Tank Camplux Electric Water Heater

small outdoor tankless water heater


  • Can be used under sink as point of use
  • Thermostat control allows temperature adjustment
  • Pressure relief system
  • Can be shelf, wall or floor mounted
  • Easy to operate
  • Compact shape for a small house to use



Fuel Source

To be able to generate the heat output, these appliances draw their power from many fuel sources. Gas, electricity, and propane are top examples of these sources. You should make it a point to match the source of fuel you have with the kind of appliance you are intent on leveraging.

Brands and Manufacturers

Many manufacturers engage in the production of these appliances. Some brands have been noted to stand out mainly because their products are richer in quality and enjoy excellent customer care. You should hence make them a priority in your search for the most suitable one.

Cost Implications

Lastly, you have to factor the cost implications. Definitely, these appliances come at costs that vary significantly from one appliance to another. The best way forward is to craft a budget and then search for that appliance that falls within that budget space.


WOW! Out long and in-depth look into the 6 GPM tankless water heater comes to an end there. We are now confident that you are appropriately equipped to make a good choice of a suitable tank for your use. Why not go ahead to make good use of the information we have given out?

Top 3 Best 6 GPM Tankless Water Heaters


Other Hot Reviews:

Will Montgomery

Will Montgomery: Electro-Mechanical Engineer, Serial Entrepreneur, and Real Estate Enthusiast. Met David at Penn State, where he earned a BS in Electro-Mechanical Engineering and a minor in Business. Expertly manages capital equipment manufacturing, refurbishing, and repair businesses, while exploring opportunities in real estate and advocating for practical heating solutions.

Recent Content