Best Whole House Tankless Water Heater Reviews & Buying Guide (2019)

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Best Whole House Tankless Water Heater Reviews & Buying Guide (2019)

How We selected Our Top Whole House Tankless Water Heater

Getting a whole house tankless water heater could be a hard job. This is because you have to get the sizing right and be sure the type you are going for is appropriate. This is why we took it upon ourselves to review the options in the market and present the best whole house tankless water heater reviews.

We invested hours of research into customer feedbacks, reviews and ratings to come up with this reviews.

Whether you prefer electric, gas or liquid propane, we have picked the top in each category.  So, be rest assured that this whole house tankless hot water heater review will guide you in making the best selection that will serve your household needs.

If you have some questions in mind about how to identify the requirements for your household or advantages and disadvantages of whole house water heaters and MORE you can scroll down or navigate through our table of contents to get your questions answered!

Top 10 Whole House Tankless Water heaters

Name Rating Prices Fuel Type Application type Location
EcoSmart ECO 27 Electric 4.1 out of 5 stars (4.1 / 5)

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CHECK PRICE ON AMAZON Electric Whole House Indoors
Stiebel Eltron 224199 240V 4.4 out of 5 stars (4.4 / 5)

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CHECK PRICE ON AMAZON Electric Whole House Indoors
Eemax EEM24027  4.7 out of 5 stars (4.7 / 5)

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CHECK PRICE ON AMAZON Electric Whole House Indoors/Outdoors
Rinnai V75IN 7.5 GPM  4.3 out of 5 stars (4.3 / 5)

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CHECK PRICE ON AMAZON Natural gas Whole house Outdoors
Rheem RTG-84XLN 8.4 GPM  4.1 out of 5 stars (4.1 / 5)

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CHECK PRICE ON AMAZON Natural Gas Whole house Outdoors
Rheem RTGH-95DVLN  4.2 out of 5 stars (4.2 / 5)

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CHECK PRICE ON AMAZON Natural Gas Whole House  Outdoor
Bosch 830 ES LP  4.2 out of 5 stars (4.2 / 5)

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CHECK PRICE ON AMAZON Natural Gas Whole house Indoor
Camplux Pro 26L 6.86 GPM  4.8 out of 5 stars (4.8 / 5)

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CHECK PRICE ON AMAZON Liquid Propane Whole house Indoor
 

Rinnai V65IP 6.6 GPM

 4 out of 5 stars (4 / 5)

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CHECK PRICE ON AMAZON Liquid Propane Whole House Indoors
Rinnai RL94eP  4 out of 5 stars (4 / 5)

Read Reviews

 

CHECK PRICE ON AMAZON Liquid Propane Whole House Outdoors

Best Whole House Electric Tankless Water Heaters

1

EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology

  • Application Type: Whole house
  • Location: Indoor
  • Volts: 240 V
  • Amps: 112.5 Amp
  • Gpm: 360F rise
  • Size: 6 x 17 x 17 inches
  • Weight: 17 pounds
  • Display: Display
  • Warranty: Lifetime

If you are located where the incoming water temperature can get as low as 37F, especially the Northern part of the US, we recommend going for EcoSmart ECO 27. This is the largest electric tankless heater in the EcoSmart series with a flow rate of 3 GPM. It is an electric whole house tankless water heater that will serve your shower and kitchen sink at the same time. There is a digital temperature that allows you to control the temperature coming out of the unit.

This feature enjoys an advanced heating system in raising water temperature. Users can get a savings of about 50% on their energy bills. There is the Ecosmart’s self-modulating technology, a feature that controls the energy needed for heating water. It comes in a compact design and is designed to be wall mounted.

Without a doubt, ecosmart whole house electric tankless water heater is one of the best. Thousands of customers have poured in positive reviews from their experience with this unit.

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PROS:
  • The unit is reasonably priced
  • Presence of a self-modulating technology
  • Wall mounted, doesn’t take up much space
  • Regulated power consumption
  • Users enjoy 50% saving on heating cost

CONS:
  • Not suitable for icy location

User Rating:

4.1 out of 5 stars (4.1 / 5)

2

Stiebel Eltron 224199 240V, 1 Phase, 50/60 Hz, 24 kW Tempra 24 Plus Whole House Tankless Electric Water Heater, Advanced Flow Control

  • Application Type: Whole house
  • Location: Indoor
  • Volts: 240V
  • Amps: 100 A
  • Efficiency: 99%
  • Gpm: 0.5
  • Temperature Range: 60F
  • Size: 7 x 20.1 x 9.6 inches
  • Weight: 16.1 pounds
  • Display: Digital
  • Warranty: 7 yr leakage/3 yr parts

Stiebel Eltron whole house tankless electric water heater also made it into our list. This unit is one of the best  Stiebel Eltron tankless water heaters as it features advanced technology in making its electric tankless water heater. One of these is an upgraded technology which ensures that the supply of hot water is without any glitch.

There is a single flow sensor design and a cover which gives easy access. With this unit, a product of the Germans, you are bound to experience at least 15% savings on your electricity bills. There is a knob on the water with which you can control the water heater.

The design is compact, takes a little space and can be mounted on the wall. It is cheap with a quick and direct installation. The maximum flow rate of this unit is 0.5GPM which gives a temperature rise of 50F.

PROS:
  • The unit does not make noise
  • It is easy to install
  • Easy and direct installation

CONS:
  • No remote control

User Rating:

4.4 out of 5 stars (4.4 / 5)

3

Eemax EEm24027 Electric Tankless Water heater Blue

  • Fuel Type: Electric
  • Application Type: Whole house
  • Location: Indoor/Outdoor
  • Gpm: 5.3
  • Volt: 240 Volts
  • Ampere: 112.5 Amp
  • Energy Efficiency: 99.8%
  • Size: 17 by 17 by 3.8 inches
  • Weight: 17.4 pound
  • Display: Digital
  • Warranty: 5 years leakage and 1 years part

Eemax whole house tankless electric water heater also made it into our list of the best tankless water heater for the whole house. This is an ideal choice if you want a tankless heater that will reduce your energy bills considerably without a reduction in the supply of hot water. This unit is best for commercial and residential usage.

This tankless water heater can comfortably handle two sinks and a shower head simultaneously in a low climate. In a hot climate alternatively, you can use 4 shower head alongside a sink. The flow rate is 5.3 gallons per minute, capable of handling all you throw at it. Users can expect optimum performance from this unit, which will last considerably as it was made of stainless steel.

Eemax tankless water heaters stands out as a result of the self-modulating technology. This reduces demand on power without compromising the supply of hot water. It is compact, hence fit for installation anywhere in the house.

PROS:
  • Presence of self-modulating technology
  • Pretty easy to install
  • Compact size
  • Ample saving in energy bills.

CONS:
  • Users will have to buy a separate breaker.

User Rating: 

4.7 out of 5 stars (4.7 / 5)

Best Whole House Natural Gas Tankless Water Heaters

4

Rinnai V75IN 7.5 GPM Indoor Low NOx Tankless Natural Gas Water Heater

  • Application Type: Whole house
  • Location: Indoor
  • Btu: 180,000
  • Gpm: 7.5
  • Energy Efficiency:
  • Size: 14 x 9 x 23 inches
  • Weight: 49.6 pounds
  • Display: a Display controller
  • Warranty: 10 years on heat exchanger

Rinnai tankless water heaters also made it into our whole house tankless water heater review. This is a recommended choice if you are low on budget and will like a continuous supply of hot water for various points in your house. Rinnai V75IN was designed for the small and medium-sized home.

This unit is reliable, durable and trusted by many users. It is compact, can be mounted on the wall and is the right choice. It comes with an energy saving feature which makes it one of the best whole house electric tankless water heater.

The unit has a wall mounted controller that gives you control of the exit water temperature. Besides, you can also keep a tab on the flow rate and temperature of the incoming water temperature.

PROS:
  • High flow rate to handle three or more points at the same time
  • Quiet operation
  • Direct monitoring of water temperature

CONS:
  • Users might experience a rise in the water bill

User Rating: 

4.3 out of 5 stars (4.3 / 5)

5

Rheem RTG-84XLN 8.4 GPM Low Nox Outdoor Tankless Water Heater

  • Application Type: Whole House
  • Location: Outdoor
  • Btu:180,000
  • Gpm: 8.4
  • Energy Efficiency: 84%
  • Size: 14 x 10 x 26 inches
  • Voltage 120V
  • Weight: 54 pounds
  • Display: digital
  • Warranty: 12 years

For many people that wouldn’t want to spend much on a tankless heater, this Rheem tankless water heater is an option. This unit is powered by natural gas, small in size and can comfortably provide a house of four with constant hot water. We love the smart technology, one of its outstanding features which reduce demands on energy.

Rheem RTG-84XLN also stands out because of its fantastic water saving capacity. With this feature, users can save over a thousand gallons of water per year. This is because the pipes are very efficient, efficient enough to reduce water wastage.

We also love the sleek and compact design which helps reduce demands on space. Rheem RTG-84XLN can serve two or three bathrooms comfortably at the desired outlet temperature.

PROS:
  • Water saving capacity
  • Compact and efficient design
  • Presence of a remote control

CONS:
  • Recommended for outdoor installation only

User Rating: 

4.1 out of 5 stars (4.1 / 5)

6

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

  • Application Type: Whole House
  • Location: indoor
  • Btu: 199,000
  • Gpm: 9.5
  • Energy Efficiency: 94%
  • Size: 5 x 9.8 x 27.5 inches
  • Weight: 79 pounds
  • Display: LED
  • Warranty: 12 years

For everyone in a large household who needs a reliable tankless water heater, we recommend Rheem RTGH-95DVLN. It is capable of serving every point that requires hot water. It is an excellent choice for people in large houses as it can handle as much as five bathrooms at a time. Users enjoy the efficiency of 94% which translates to reduced gas consumption without a reduced supply of hot water.

This Rheem whole house electric tankless water heater stand out because of the innovative and intelligent control system. With this, the ability of the unit to reduce energy bill is impressive. You can monitor the temperature via the led display on the device.

This unit can be used anywhere indoors. We love the outstanding safety features of Rheem RTGH-95DVLN. One of the best part is the antifreeze protection and the ability to alert you of a malfunction with any part.

PROS:
  • Very efficient
  • Remote controlled unit
  • Compact design
  • Beautiful safety features

CONS:
  • Installation cost is a little on the high side

User Rating: 

4.2 out of 5 stars (4.2 / 5)

Best Whole House Propane Tankless Water Heaters

7

Bosch 830 ES LP Thermo Tankless Water Heater, Propane

  • Fuel Type: Liquid Propane
  • Application Type: Whole house
  • Location: Indoor
  • Btu: 175,000
  • Gpm: 8.3
  • Energy Efficiency: 83%
  • Size: 2 x 17.9 x 30.5 inches
  • Weight: 74pounds
  • Display: Digital
  • Warranty: 15 years

We also have in here Bosch whole house tankless water heater. This brand, Bosch 830 ES LP Therm Tankless water heater is powered by propane and can serve multiple points at once. The heat exchanger design is unit, and it features a modulating temperature sensor which reduces propane consumption while keeping the hot water flowing.

Bosch 830 ES LP Therm Tankless water heater gives a temperature rise of 35F and a flow rate of 8.3 GPM. Users will enjoy a whole 30% savings on propane which makes it efficient in the long run. Also, it comes with energy star certification which qualifies the user for a government rebate.

You can install this unit indoor which can be vertically or horizontally. It is easy to install and works with stainless steel vent. Bosch 830 ES LP Therm Tankless comes with patented heat exchanger design which helps get rid of sandwich in the pipe. Thus, you can be assured of a prettily long and lasting unit.

PROS:
  • Long warranty period
  • Electronic ignition system
  • Users enjoy government rebate
  • Good safety features

CONS:
  • A little bit pricey

User Rating: 

4.8 out of 5 stars (4.8 / 5)

8

Camplux Pro 26L 6.86 GPM Outdoor Propane Tankless Water Heater

  • Fuel Type: Liquid Propane
  • Application Type: Whole
  • Location: Indoor
  • Btu: 180,000
  • Gpm: 6.86
  • Voltage: 120Volts
  • Energy Efficiency: 82%
  • Size: 6 x 6.5 x 22.6 inches
  • Weight: 49.9 pounds
  • Display: Digital
  • Warranty: 1 year

We also have here an outdoor propane whole house water heater – Camplux Pro 26L 6.86 GPM. This is a classic tankless heater with a high flow rate and the capacity to serve three points at a time. It gives a continuous supply of water with a heating capacity of 180,000 BTU/hour.

Camplux whole house tankless water heater stands out because it comes with attractive safety features. As a result, users will enjoy overhanging protection, antifreeze protection and flame failure device protection. It also comes with remote control with which you can control the outlet water temperature.

Camplux Pro 26L 6.86 GPM is a product of JAGAL group, one of the trusted brands in producing top quality household appliances. Users will get impressive energy-saving features, beautiful innovations, and portability with this brand. Camplux boast of using the most advanced technology in heating water which allows users to enjoy up to 50% savings on cost.

PROS:
  • Beautiful safety features
  • Simple and compact design
  • Presence of remote control
  • Impressive savings on energy bills

CONS:
  • The unit must be installed by a professional, or you risk voiding the warranty

User Rating: 

4 out of 5 stars (4 / 5)

9

Rinnai V65IP 6.6 GPM Indoor Low NOx Tankless Propane Water Heater

  • Fuel Type: Propane
  • Application Type: Whole house
  • Location: Indoor
  • Btu: 150,000
  • Gpm: 6.6
  • Energy Efficiency:
  • Size: 9 x 8.8 x 23.6 inches
  • Weight: 49.6 pounds
  • Display: Digital
  • Warranty: 10-Year Warranty on Heat Exchanger, 5 Year Parts

If you need a small whole house tankless water heater, we recommend Rinnai V65IP. This unit can be located anywhere in the house for a continuous supply of clean and hot water. It is the ideal unit to serve your laundry, washing machine and shower at the same time.

Powered by propane, it is an energy efficient unit with reduced demand on electricity. Installation and operation are simple as there is an LCD which allows you to set and monitor your outlet water temperature. Your outlet water temperature could be 98F, and could also be as high as 140F.

This device will surely save you money in the long run. It comes with a temperature lock system which prevents an unintended shift in temperature. We recommend Rinnai V65IP if you live in places with hard water.

PROS:
  • The unit does not take up space
  • Easy to install

CONS:
  • Little delay before water flows

User Rating: 

4 out of 5 stars (4 / 5)

10

Rinnai RL94eP Outdoor Propane Tankless Water Heater

  • Fuel Type: Liquid Propane
  • Application Type: Whole house
  • Location: Outdoor
  • Btu: 199,000
  • Gpm: 9.4 gpm
  • Energy Efficiency: 83%
  • Size: 14 x 10 x 23 inches
  • Weight: 44 pounds
  • Display: Digital
  • Warranty: 12 years on heat exchanger, five years on parts

Here is a Rinnai whole house tankless water heater powered by propane. It is a heavy duty unit, capable of heating as much 9.4 gallons per minute. It is very efficient as it does not consume much propane. This leads to impressive savings which helps gain a considerable return on investment in a short time

Rinnai RL94eP is an outdoor unit and comes with a clean valve, a feature alien to other tankless heaters. Being an outdoor unit, it can deliver water to heights, 185 feet above. It is small, requires no venting since it is used outside and comes at a reduced overall price, capable of wall mounting.

Users get extra convenience and diagnostic with a 24-hour programmable controller. This allows users to keep a tab on the temperature with the ability to troubleshoot. The heat exchanger is made of high-grade copper, ensuring durability.

PROS:
  • Reduced demand for energy
  • A considerable saving on propane
  • A long warranty period

CONS:
  • Installation is critical and must be done by an expert

User Rating: 

4.1 out of 5 stars (4.1 / 5)

Frequently Asked Questions & Buying Guide

Advantages of Whole House Tankless Water Heater

  1. Lower Running Cost

A good quality tankless water heater whole house is equivalent to three or four points of use tankless water heaters. Even though the whole house unit comes at a pretty high price, the savings you will get will offset the cost price in the long run.

  1. Takes Less Space

Do not be fooled by the name. Since these devices do not use a tank, they are minimal in size. This qualifies them to be mounted on the wall, leading to considerable space savings.

  1. Long Service Life

Typically, a whole house tankless water heater comes with a service life of 20 years. The best part is if you buy from top rated brands, you can get a warranty period of as much as 15 years.

  1. High Volume of Distribution

The major selling point of tankless water heater for the whole house is to make hot water available for different points of use at the same time. Hence, you can have a warm shower while another person can be doing the dishes. The two processes can go on at the same time without one having to wait for the other.

Disadvantages of Tankless Water Heater for Whole House

As impressive as the advantages of a whole house tankless water heater are, there are some shortcomings as well.

  1. Long waiting time

This is a common issue with whole house tankless heater since it has to supply hot water to various points in the house at a time. This can be an issue if you have a big family. As a result, you might have to wait for a minute before getting hot water

  1. High Installation Cost

This is one of the most significant downsides of tankless water heater for the whole house. Alongside the high purchase cost, there is also installation cost and the cost of accessories like pipes and venting. All this adds to the overall cost.

How Much does it cost to Install a Whole house tankless Water Heater?

The installation cost of a whole house tankless water heater is usually on the high side. Although, this often depends on the brand and the labor involved. However, on average, you can have a tankless water heater for the whole house around $1,500.

In deciding the cost of installation, labor and the heating requirement of the heating equipment is a significant factor. A professional will likely charge you at a flat rate of $100 to $45 for labor cost.

It is also important to factor in the cost of materials, depending on the type of whole house tankless water heater you are going for. The cost of wiring, fuse box if you will be using an electric whole house tankless water heater, and mounting hardware, gas connector fit, termination vent kit if you will be going for a gas whole house tankless water heater.

 

Types of Tankless Water heater

Besides the mode of usage, a tankless water heater can also be classified based on what powers them. We have three primary classifications with this:

  1. Electric Tankless Water Heaters

Whole house tankless electric water heaters are usually small and pretty easy to install since they do not require combustion. They are straightforward in installation and very efficient.

  1. Natural Gas Tankless Water Heaters

Powered by a tankless water heater, whole house tankless water heater natural gas employs a complex vent system to expel fumes and for air flow. While they are costly, they are powerful, with a high flow rate.

  1. Propane Tankless Water Heaters

Whole house propane tankless heater uses propane as the primary source of power. It also requires venting just like the natural gas type.

How to Select Your Whole House Tankless Water heater

In choosing a tankless water heater for whole house, you should consider these significant factors:

  1. Incoming water temperature

Depending on where you are located, the incoming water temperature does vary. Hence, your choice of whole house tankless water heater should be based on this value. This is because inflow water temperature affects the maximum flow rate that can be gotten from a tankless water heater

  1. Flow rate Required

This is also one of the critical factors you should consider before selecting a tankless water heater. This is critical to avoid overestimating or underestimating your tankless water heater.

It is essential to get the flow rate at crucial points like shower heads, kitchen sinks, etc. to have an approximate value of what you will need.

  • Electrical Services

If you are going for an electric tankless whole house unit, you should take note of the electrical system of your home. Bear in mind that Stiebel Eltron tankless models, for instance, draw between 208 to 240 Volts. Besides, an electric tankless heater demands a tremendous amount of power at once. As a result of this, your home AMPS electrical service unit must be able to support this.

Checking the main breaker of the house is an excellent way to determine the amps of electrical service that runs in your home.

These three values are pretty critical in getting the size of your tankless water heater for the whole house right.

Conclusion

Investing in a tankless water heater for whole house use could be costly. However, it is a thoughtful investment that will be worth it in the years to come.

We have examined essential things to keep in mind before choosing a whole house tankless water heater. Be sure to follow our review and let it guide you to selecting the best whole house tankless water heater for use at home.

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