9 Best All Home Tankless Water Heater Reviews For Large/Small Homes Shower Use

The all home tankless water heater, also known as a whole-house tankless water heater, is widely used for large families. A large power heating device allows you to enjoy constant hot water for both bathing and dishwashing. To avoid buying low quality one, please read our top-rated best all home tankless water heater reviews first before purchasing.

What Is the Best All Home Tankless Water Heater on the Market?

Picking the Best Whole Home Tankless Water Heater From Comparison Chart

How Many GPM Tankless Water Heater Do I Need For All Home Use?

The GPM you need for a tankless water heater is given by the flow rate. Also, you need to determine the temperature and flow rate you need. It is advisable to try and save money. What devices are you going to run and determine their flow rate and add up their flow rates to find GPM?

For instance, if you want to run two showers at any given time, you require 5 GPM from your tankless water heater. On the other hand, if you run a washing machine and shower at the same time, you should get 4.5 GPM from your water heater.

What size tankless water heater do I need for a family of 4?

Ideally, this breaks down to families with 3 to 4 people require a 40 to 50-gallon water heater. The size can also vary depending on other parameters.

home tankless hot water heater

How Long Do Tankless Water Heaters Last?

20 Years!

The truth is that tankless water heaters have an estimated lifetime of more than 20 years. Since they have easily available spare parts, they can extend their lifespan by many years. On the other hand, tank water heaters last about ten years. The longer lifespan of water heaters is associated with the lack of heat losses with the water tanks.

Do All Home Tankless Water Heaters Need Maintenance?

Yes. However, their maintenance requirements are minimal. Moreover, most brands have readily available replacement parts.

How Often Should You Clean a Tankless Water Heater?

Cleaning tankless water is a must and ought to be done once per year. Depending on usage, some units may need cleaning after every six months if they operate at high temperatures or they heat hard water.

Top 9 Best All Home Tankless Water Heaters Reviews

Best All Home Heater – Rheem RTEX-24 Water Heater

home tankless water heater



The Rheem RTEX-24 Water Heater is a professional unit designed to provide on-demand hot water. It is ideal for both multiple and single-point applications. Other than the compact design that makes it easy to mount anywhere you want, it has a temperature control panel that allows you to increase the temperature of the water as you.

You will also like the fact that the heating elements are made of robust copper with brass top to increase durability. Another vital feature of this unit is self-modulation technology.

Key Features

【Unlimited Water Supply】

The primary reason you need a water heater is to get hot water. What is the point of buying a unit that cannot deliver on this? Fortunately, Rhem RTEX 24 provides you with a continuous supply of hot water. Also, this unit can fit both large and small households.

【Easy Installation】

You should note that installing the water heater can be quite difficult. However, with this tankless water heater, this is not something to worry about. In fact, you can set up the heater within a few minutes, and it is ready to use.

【Space Saving】

In this case, the size of this heater is an important advantage you will love if you have limited space in your home. This heater has a contemporary and sleek design that makes it easy to install anywhere.



Best Small Electric – Camplux Electric Tankless Water Heater

home tankless water heater



If you want a portable water heater, then you should get Camplux Electric Tankless Water Heater. This heater takes water heating to another level. You will find the model to be perfect if you are on the move and have challenges to get hot water whenever you need it.

Key Features


You should note that this tankless water heater can be used for both indoor and outdoor applications. As a result, the portability is quite important. That is because it allows you to carry your unit wherever you go. You can easily set up this water heater nearly anywhere you want.

【Energy Saving】

You may be surprised to learn that this water heater needs only 2 PSI for activation. Thus, this unit will save you a lot of money you pay for electricity to heat your water.

【Flow Rate】

Although this unit delivers about 1.3 GPM, which is relatively lower, it helps that it provides continuous hot water supply.

【Easy Installation】

The installation process for this tankless water heater is quite straightforward as what you need is electricity, water, and propane gas. It can also operate on batteries.



Best Large Power – Rheem RTEX-36 Water Heater

home tankless hot water heater



The Rheem RTEX-36 Heater is designed for households with moderate water demand. Ideally, this unit can deliver up to 8 GPM. This is quite high for an electric water heater. If you require a lot of hot water, you can use this unit in your bathroom or under the sink.

Key Features

【Flow Rate】

As noted above, this water heater can deliver up to 8 GPM. However, there are certain factors that determine whether the heater can fully deliver. Most households report 6 GPM. Even with this flow rate, you can run two showers at the same time and even do your laundry.

【Self-Modulating Technology】

This is an important feature that adjusts the water flow rate to suit your needs. Therefore, if the flow is considered too high, it will slow the flow to ensure you get hot water at the temperature you need it.

【Easy Installation】

Since this tankless water heater is lightweight and compact, you have the freedom to install it wherever you want. For instance, you can even install it under the sink mount. Remember that this water is electric and does not require venting. Thus, you can wall-mount it and safe floor space. Before you install, ensure a circuit breaker can support the amperage. The fact that this is a simple installation process, it will not cost you much even if you hire an expert to help you.



Best Valuable – Rheem RTEX-13 All Home Electric Tankless Water Heater

home tankless water heater



This is a stylish and professional water heater that has a lot of modern features. With the trendy look and mid-range price, you have a powerful water heater that will deliver. The heater ensures you have on-demand water without the need for a reserve water tank. The external thermostatic control has an adjustable, stylish, and compact.

Key Features

【Simple Installation】

Ideally, you do not want to struggle with water heater installed at home. Fortunately, you do not have to worry about this water heater. You will find the installation process being easy and simple, and you can install it without the help of a plumber.

【Energy Efficient】

This unit has 99.8% energy efficiency. Thus, you will save a lot of money on your monthly expenses. The unit utilizes electricity, but it is cheaper than using a typical water heater.

【Compact and Lightweight】

This water heater is lightweight and small. Measuring only 4 x 9 x 12 inches and weighing only 8.5 lbs, this is a perfect heater for smaller homes and apartments. The fact that it is light, it is quite easier to install it.



Best Commercial – Takagi Water Heater

home tankless water heater



Takagi Water Heater is designed for a large family that requires a lot of water supply. It can also be used by small businesses. This tankless water heater is well-known for providing 9.5 GPM. Ideally, the flow rate is quite high as compared to what most tankless water heaters can deliver. Thus, it can support four showers running at the same time.

Key Features


This unit is energy star rated. In fact, it is said to be 25 times better at heat transfer than other units. That is made possible with the primary heat exchanger that utilizes commercial-grade copper allow instead of stainless steel.

【Excellent Durability】

You will find this water heater to be quite durable. That is because of the high-quality components. Thus, you are guaranteed to use it for many years before replacing it.



Best Natural Gas – Rinnai RU199iN All Home Tankless Water Heater

home tankless hot water heater



If you want a power water heater, then you should consider Rinnai RU199iN. This unit can deliver up to 11 GPM and can operate 3 to 6 fixtures at any given time. Being an energy star certified, it has a UEF rating of 0.93. You should note that this heater is built for indoor use and burns natural gas, but can also use propane. The unit can be connected to the internet, making it a smart appliance. It is advisable to get this unit if you need huge amounts of hot water.

Key Features

【Endless Hot Water】

With this unit, you do not have to schedule your hot water needs. That is because the heater can allow you to do your laundry, run the dishwasher, and enjoy hot showers.

【Energy Efficient】

With the ThermaCirc360 technology, the unit reticulates hot water through the pipes to ensure you have hot water quite quickly. You should note that when you wait for hot water to get from the tank to the shower, you waste a lot of energy.

【Save Valuable Space】

The truth is that your water heater does not have to be massive. Its compact design allows for the installation in the non-traditional spaces like crawl space, closet, and attic.



Large Power Natural Gas – Rinnai V75iN Tankless Water Heater

home tankless water heater



The Rinnai V75iN Tankless Water Heater is fitted with advanced features that make it more powerful than others. You should think of it as a small investment for now and the future when you combine reliability and sustainability. In fact, each part of this water tank has replicable components that you can find easily. Also, the average life expectancy of this unit is 20 years.

Key Features

【Ergonomic Design】

You should note that this unit is lightweight and compact. That makes it easier to mount it anywhere in your home, office, or salon. Also, its white appearance makes it more appealing. Its compact size means you are left with a lot of space.

【Powerful Performance】

You may be surprised to discover that this water heater will provide you with stellar performances whenever you need it. For instance, it delivers 7.5 GPM and 180,000 BTU. That is quite high when you compare it with other units in this given range. With this capacity, you can satisfy your household’s water requirements.

【Easy to Install】

Since this heater is tankless, it means maintenance requirements are minimal. Its direct vent system makes the heater more efficient and improves its performance. Also, the unique system means that the water heater can be mounted even in attics and closets.


The manufacturer is quite keen on the safety of the users. The scale control system ensures that this unit does not break because of the accumulation of scale. In this way, it helps improve the lifespan of the heater.



Best Cheap – Marey Power GA10LPDP Tankless Water Heater

home tankless hot water heater



The Marey Power GA10LPDP Tankless Water Heater is a compact model that allows for easy installation and saves space. The unit can supply an unlimited amount of water as required and permits you to regulate water flow for better temperatures. Thus, if you need on-demand and instant hot water, this heater is perfect for that. In addition, it is a great alternative for homes that experience routine power outage as the heater does not need electricity. The unit offers 3.1 GPM to offer hot water for the home family.

Key Features

【Unlimited Water Supply】

You should note that this unit is designed to supply an endless amount of hot water. For instance, it can provide water for up to three appliances running at the same time.

【Compact Design】

The compact design of this unit saves space and is quite easy to install. Ideally, you only require a 2D cell battery to ignite it.


This unit includes a gas hose that has been approved by CSA. This water heater is perfect for cabins, remote areas, and campsites.



Best For Large Family – Rinnai V94iP Whole Home Tankless Water Heater

home tankless water heater



Rinnai V94iP Tankless Water Heater is designed to provide up to 86% efficiency rating. You will find it perfect for small businesses and homes. The compact models provide the reliability you can expect from advanced features such as wi-fi compatibility. This unit is a perfect combination of value and comfort. You will find the models to be easy to install, compact, and reliable you can expect with a performance for new homes and remodels.

Key Features

【Energy Savings】

The unit has a compact design that cuts carbon dioxide emissions. Also, it conserves water and uses less energy.

【On-Demand Water】

This unit provides hot water as you need it. With this unit, it means you cannot run out of hot water in your home.



The all home tankless water heater suits not only for a large family, but you can still use it in your camper or for a tiny apartment.

If you live somewhere with 2-3 family members, you can choose the Rheem 240V tankless heater for both shower and kitchen use.

If you run a bathing store and need one with large power, the Takagi H3-DV-N condensing commercial tankless water heater can help you a lot.

If wanting a heater with high efficiency, the Rinnai natural gas tankless water heater is capable of saving much energy costs each month.



David: Penn State-educated Mechanical Engineer and Business-savvy Fluid Dynamics Specialist. Balances family plumbing business support with a thriving engineering career at a top, undisclosed company. (they want it that way) I help Will with plumbing and HVAC needs on his Real Estate.

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