6 Best 5 GPM Tankless Water Heaters for Small & Large Homes

best 5gpm tankless water heater

Water heater tanks come in varied shades and shades. The 5 gallons-per-minute kinds are some of the most commonly used tanks on the market today. It is hence vital to learn much about them. That is the only way you may get to appreciate them deeper and make good use of them when the time comes. Here in this post, we would pick out the best 5 GPM tankless water heater on the market and made expert reviews for you.

Just keep reading!

What Is the Best 5 GPM Tankless Water Heater on the Market?

Comparison Chart of 5 GPM Tankless Water Heaters of 2020

Photo Title Price Buy
Rheem 18kW 240V...image Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater Check Latest Price
Stiebel Eltron Tankless...image Stiebel Eltron Tempra 36 Plus On Demand Hot Water $839.00 Check Latest Price
Marey ECO150 Electric...image Marey ECO150 220V/240V-14.6kW Tankless Water Heater with Smart Technology $207.05 Check Latest Price
Tankless Water Heater...image ECOTOUCH 9KW 220V 240V On Demand Water Heater Check Latest Price

Top 6 Best 5 GPM On Demand Tankless Water Heater Reviews

1. Rheem 240V RTEX – 18 Residential Tankless Water Heater – 4.4GPM


best 5gpm tankless water heater for shower


  • External digital tankless water heater
  • Easy to control water temperature
  • LED display
  • Advanced self-modulating technology
  • Adjust power
  • High quality internal materials
  • Easy to install and operate

2. Stiebel Eltron Tempra 36 Plus Tankless Water Heater – Multiple Power Available


small tankless water heater


  • Continuous hot water supply
  • Sleek design
  • Compact shape to save enough space
  • Electronic switch activated
  • Pretty silent in operating
  • Copper sheathed heating elements
  • Long-time warranty

3. Marey ECO 150 Smart Technology Tankless Water Heater – 5GPM


best 5gpm tankless water heater


  • ETL approved quality product
  • Simple adjustment
  • LCD panel for easy operation
  • Flow switch activation mechanism
  • Constant hot water supply
  • Perfect for shower use

4. ECOTOUCH Tankless Water Heater with Modulating Technology – 1-5 GPM


best 5gpm tankless water heater


  • 9kw heating system to provide constant hot water
  • 3s fast heating time
  • Smart self-adjustment
  • 99.8% high energy efficient
  • Safe and durable to use
  • No cold water sandwich

5. RollingBronze 18L Gas Propane Tankless Water Heater for Home Shower – 5 GPM


5gpm tankless water heater


  • Modern shape
  • Auto-protection system and flame inspection
  • High energy efficient to save heating costs
  • Lower water-pressure startup
  • Low burning noise
  • Stable water flow

6. ZGYQGOO Propane Gas Tankless Water Heater with Shower Head – 4.8 GPM


best 5gpm tankless water heater


  • 10L large capacity
  • High-efficiency heating tube
  • Corrosion resistance
  • Superior quality tank
  • Perfect for under sink or point of use
  • Multiple capacities available

Types of 5 GPM Tankless Water Heater And Their Common Features

The 5 gallons-per-minute water heaters are available in various kinds. Below are some of the top kinds and their corresponding top features:


As the name implies, the electric heater uses mains electricity to supply its heating power. It is quieter, cleaner, and very convenient to mount and engage. On the flip side, this kind of heater is costly to engage in in the long run. That is because it inflicts higher levels of utility bills.


This one draws its power from liquefied petroleum gas. Its heat output is subsequently higher and hotter. Yet one more advantage is the fact that it is capable of mobile applications. It is hence suitable for remote applications such as picnics and camper water heater. Some degree of care is necessary though as gas is ordinarily dangerous.


Propane is even hotter than the liquefied petroleum gas. It has the added advantage of being packaged in smaller bottles that are easier to transport out and about the desired area. This is the kind of heater you want to leverage if you are constantly on the move.

Hybrid Electric Water Heaters

These ones derive their heating power from both electricity and ambient temperature. They hence bring along the convenience of being usable all round regardless of the prevailing environmental temperatures. Their energy efficiency is also higher (approximately 60% more than its counterparts.) It is a good one to use in your home.

Solar Water Heaters

Solar water heaters derive their heating power from the sun. They are the most environmentally friendly of all the heaters we have around. Then, their long-term costs of operations are also lower. However, they are only limited in applicability to those times of the year when there is plenty of solar energy like summer.

Condensing Water Heater

The condensing water heater is a special kind of tankless water heater. Unlike your ordinary heaters, this one draws its heating power from the unused gas of your home. It is thus more effective than the many other alternatives. Moreover, it also saves you money by utilizing every drop of gas in your home.

Can I Use a 5 GPM Tankless Water Heater for Whole House Use?

YES, you can! However, there is a catch. It is sufficiently capable of powering only a modest home with no more than four occupants. That is because it does get stretched and overwhelmed when there are more users in the home. Thus, you have to ascertain just how many people might need it in the long run before embarking on a purchase.

Then again you have to consider the structural makeup of the appliances in question. A heater that is used by many people tends to wear out too soon. If you have many people in mind, you have to insist on that one that is strong enough. It has to preferably feature the stainless steel material makeup.

Things to Consider in Getting the Best 5 GPM Tankless Water Heater

Fuel Source

Your first consideration should be the source of fuel that shall power the water heater. Obviously, the right heater has to be powered by a source that is convenient for you. Choose a portable solution like propane and liquefied petroleum gas if you intend to relocate to a faraway place.

Maintenance Needs

From time to time, these appliances break down and require restoration. The kind of expertise needed to do so varies greatly from one appliance to another. It is necessary to know the kind of maintenance that your appliance shall require beforehand. That way, it will be possible to make appropriate arrangements for the same.

Warranty and Aftersales Services

A good appliance has to enjoy an excellent warranty and after-sale service. That is because these appliances are prone to damages and mishaps of varied forms. You want to secure yourself as much as possible when deriving the benefits they potentially bring along. Check the user manual to get to know more about this metric.

Energy Efficiency

This refers to the amount of energy an appliance consumes versus that which it generates as heating power. Needless to say, a good appliance has to consume less yet give out more. That is the only way it can maintain your water in the highest temperatures but keep your utility bills in the absolute minimum.

Space Available

How much space do you have available on your premises? These appliances definitely require some space to mount. It is important to match the equipment you have in mind with the amount of space at your disposal. Closely related to this is the configuration of the space altogether.

Controls vs. Expertise

These appliances come in various degrees of sophistication. This is evidenced by the control features they come along. It is necessary to get to know about your own level of expertise to be able to select that heater that is easier to comprehend and engage.

Desired Longevity of Use

For how long would you wish to utilize the water heater? Is it for one time or continuous applications? If you have the long run in mind, you should look for that one that is strong and resilient enough to endure the harshest impacts. It has to be manufactured using strong materials like stainless steel and Aluminum alloy.

We believe you have received a good head start. You are now better placed to make good use of the appliances altogether. As you may see, this tankless water heater is not so complicated. This combined with the cheap nature means relative ease of accessibility on your part. Do go for it!

Final Pick: Top 3 Best 5 GPM Tankless Water Heater


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.

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