Best Tankless Water Heater Reviews Top 12 & Buying Guide (2019)

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12 Best Tankless Water Heater Reviews

After long hours of research and gathering customer feedback on the various top brands and models in the market we present you the 12 best tankless water heater reviews.

If you are unsure what type of tankless water heater you need for your residential household you can scroll down the page or click on the table of contents to read our buying guide first. This will help you identify what is suitable for your needs.

Our choice of the best tankless water heaters was divided on the various fuel types that was from our other findings which can be read on the best electric tankless water heaters, the best gas tankless water heaters and the best propane tankless water heaters. Hence there are options for all preferences.

Additionally we also ensured that we included our top rated picks as per application, single point of use, multiple point application, and of course whole house application.

Whether you prefer an outdoor or indoor tankless water heater, we got you covered.

Here are the top twelve tankless water heater reviews, from some of the top brands in the market.

12 Best Tankless Water Heaters Comparison Table

Name Rating Prices Fuel Type Application Location
EcoSmart ECO 27 4.1 out of 5 stars (4.1 / 5) Read Reviews CHECK PRICE ON AMAZON Electric Whole house Indoor
Stiebel Eltron 224199 240V 4.4 out of 5 stars (4.4 / 5) Read Reviews CHECK PRICE ON AMAZON Electric Whole house Indoor
Stiebel Eltron 24 Plus Tempra, tankless Water Heater 4.4 out of 5 stars (4.4 / 5) Read Reviews CHECK PRICE ON AMAZON Electric Single Point or Multiple or Whole House Indoor/Outdoor
Rheem 240V heating Chamber RTEX-13 Residential Tankless Water Heater 4.2 out of 5 stars (4.2 / 5) Read Reviews CHECK PRICE ON AMAZON Electric Single Point of use and Multiple Indoor/Outdoor

Takagi T-KJr2-IN-LP Indoor Tankless Water Heater

4.2 out of 5 stars (4.2 / 5) Read Reviews CHECK PRICE ON AMAZON Liquid propane Single Point Indoor
Bosch 830 ES LP Therm Tankless Water Heater, Propane 4.2 out of 5 stars (4.2 / 5) Read Reviews CHECK PRICE ON AMAZON Liquid propane Whole house Indoor
Rinnai RL94eP Outdoor Propane Tankless Water Heater, 9.4 Gallons Per Minute 4.1 out of 5 stars (4.1 / 5) Read Reviews CHECK PRICE ON AMAZON Liquid propane Whole house Outdoor
Aquah Indoor Liquide Propane Gas Tankless Water Heater 16L / 4.3 GPM, Whole House 3.4 out of 5 stars (3.4 / 5) Read Reviews CHECK PRICE ON AMAZON Liquid propane Whole house Indoor
Rinnai V65IN 6.6 GPM Indoor Low NOx Tankless Natural Gas Water Heater 4.7 out of 5 stars (4.7 / 5) Read Reviews CHECK PRICE ON AMAZON Natural gas Whole house Indoor
Rheem RTG-64DVLN Prestige Low NOx Indoor Direct Vent Condensing Tankless Natural Gas Water Heater 4.1 out of 5 stars (4.1 / 5) Read Reviews CHECK PRICE ON AMAZON Natural gas Whole house Indoor
Camplux 12L 3.18 GPM Indoor Tankless Natural Gas Water Heater 5 out of 5 stars (5 / 5) Read Reviews CHECK PRICE ON AMAZON Natural Gas Single point Indoor
Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas 4.3 out of 5 stars (4.3 / 5) Read Reviews CHECK PRICE ON AMAZON Natural Gas Multi point Indoor

The Top 12 Tankless Water Heaters Reviewed

tankless water heater reviews

  • Application Type: Whole house and Multiple Application
  • Fuel Type:Electric
  • Location: Indoor
  • Volts: 240 V
  • Amps: 112.5 Amp
  • Gpm: 3
  • Temperature Range: 60F rise
  • Size: 3.6 x 17 x 17 inches
  • Weight: 17 pounds
  • Display: Display
  • Warranty: Lifetime

One of the most popular electric tankless water heaters available online is EcoSmart. There are options available in terms of the size and KW you need. There are options for point of use, multiple applications and the most common for the whole house. It can heat as much as 3 gallons of water per minute. If you live in areas where the incoming water temperature gets as low as 37F, and homes in the Northern US, EcoSmart ECO 27 is a terrific choice. For homes in the southern US, it can heat as much as 6 gallons of water per minute

This is your ticket to an endless supply of hot water without an excessive demand on your energy bills. EcoSmart claims it can save you as much as 50% in water heating cost. Besides, it comes in a sleek design which doesn’t take much space. The self modulating technology also helps regulate the demand on energy.

It features copper and stainless component which ensures durability and optimum performance. It stands out as one of the best electric tankless water heater brand in the market due to the lifetime warranty that comes with Ecosmart product.

PROS:
  • Assembled with long-lasting and durable materials Lifetime warranty
  • Regulates power consumption
  • Presence of self modulating technology

CONS:
  • Not ideal for icy locations

User Rating:

4.1 out of 5 stars (4.1 / 5)

best tankless water heater

  • Application Type: Whole house
  • Fuel Type:Electric
  • Location: Indoor
  • Volts: 240 V
  • Amps: 100 Amp
  • Efficiency: 99%
  • Gpm: 0.5
  • Temperature Range: 60F
  • Size: 21.7 x 20.1 x 9.6 inches
  • Weight: 16.1 pounds
  • Display: Digital
  • Warranty: 7 yr leakage/3 yr parts

Another popular choice that has proven to be a winner in terms of performance functionality is Steibel Eltron 224199.  It is one of the advanced brands of electric tankless water heater with sophisticated technology to ensure a steady supply of hot water. It comes with series of advanced features to ensure that users get the best out of this unit.

It features an exclusive technology – the Advance Flow Control which ensures that you get hot water at steady temperature, regardless of the number of points where you use hot water. It comes with the advantage of a simple design and easy installation with optimum performance to deliver hot water at consistent temperature.

Customer satisfaction is very high with this unit as more than 85% of customers reported total satisfaction with the unit. It is indeed a ticket to endless hot water at no extra cost

PROS:
  • Users reported considerable decrease in energy bills
  • Constant hot water temperature
  • Advance flow control feature
  • Quick and easy installation

CONS:
  • Some user complained of the slow flow rate of hot water

User Rating:

4.4 out of 5 stars (4.4 / 5)

  • Fuel Type:Electric
  • Application Type: Single Point or Multiple Application or Whole house
  • Location: Indoor or outdoor
  • Volts: 240 V
  • Amps: 100 Amp
  • Efficiency: 99%
  • BTU: 380,000
  • Gpm: 0.77
  • Temperature Range: 86F – 140F
  • Size: 4.6 x 16.6 x 14.5 inches
  • Weight: 1 pounds
  • Display: Digital
  • Warranty: 7 yr leakage/3 yr parts

Also, in the list of top electric tankless water heater brand is Stiebel Eltron Tempra 24 Plus. It is the ideal unit recommended for single point usage capable of saving you as much as 20% on energy bills. It is a high class tankless water heater because it comes with many top certifications which make it safe and appropriate for use at home.

With a sleek and compact design, it occupies just a little space making it ideal for indoor installation without much demand on space. One of the things that stand the Stiebel Eltron Tempra 24 Plus out is that it was manufactured by Germans hence; you are assured of a reliable and trustworthy product.

You get to set the outlet water flow temperature to the desired point with a knob. The heating elements are made of copper which translates to long term usage and optimum performance. Over 500 people expressed satisfaction with this unit hence, it is sure to meet your need.

User Rating:

4.4 out of 5 stars (4.4 / 5)

  • Fuel Type: Electric
  • Application Type: Single Point of use and Multiple Application
  • Location: Indoor/Outdoor
  • Btu: 199,000
  • Gpm: 1.5 gallons per minute
  • Energy Efficiency: 99.8%
  • Size: 4 by 9 by 13 inches
  • Volt: 240V
  • Ampere: 70 Amp
  • Weight: 8.5 Pounds
  • Display: Digital
  • Warranty: 5-year heat exchanger and 1-year parts limited warranty.

RTEX – 13 electric tankless water is compact and suitable for under the cabinet or sink installation. It is homes and offices with abundant accessories that makes it easy to use. It is best suited for point of use application although, it can serve double occupant housing. It can also be used as multiple application where it can serve multiple fixture although, a maximum of three.

With a maximum flow rate of 4.8 gallons per minute, it can provide adequate hot water to serve three points. However, the flow rate is a function of the incoming water temperature. This tankless water heater emplys copper alongside a strong brass heat exchanger to heat water. This makes it strong and durable while regulating the demand on power supply.

Rheem RTEX 13 is compact, and the ideal replacement for bulky traditional water heater. It requires 240 volts alongside a 60 amps power supply

PROS:
  • Compact and light in weight
  • Installation is straightforward
  • Significant savings on energy with an efficiency of 99.8%
  • Quick and easy installation

CONS:
  • Not recommended for cold climates

User Rating:

4.2 out of 5 stars (4.2 / 5)

  • Fuel Type: Liquid propane
  • Application Type: Single Point
  • Location: Indoor
  • Btu: Minimum 19,500 Maximum 140,000
  • Gpm: 6.6
  • Energy Efficiency: 81%
  • Size: 6.7 ” x 13.8″ x 20.3
  • Weight: 38 pounds
  • Display: –
  • Warranty: 10 years on heat exchanger and 5 years on parts

If you are on a budget and need a high rated liquid propane powered tankless water heater, consider the Takagi T-KJr2-IN-LP Indoor Tankless Water Heater. This is a cheap and smart tankless heater that delivers a constant flow of hot water at whatever temperature you desire.

It is capable of working between 19,500 and 140,000 BTU with a direct vent system that ensures the safety of everyone in the house. Water flows through the heat exchanger and absorbs heat which raises the water temperature. Without a doubt, this is one of the top tankless water heater brands due to the abundance of safety features like surge protection, overheat and freeze protection, etc.

The entire unit weighs 38 pounds with a dimension of 6.7 ” x 13.8″ x 20.3 inches, making it perfect for indoor use. With a maximum flow rate of 6.6 GPM, it can comfortably handle two laundries and a shower.

PROS:
  • Light in weight and easy to install
  • Comes with ten years warranty
  • 140,000 BTU with an efficiency of 81%
  • Presence of helpful safety accessories

CONS:
  • Slight working noise

User Rating:

4.2 out of 5 stars (4.2 / 5)

  • Fuel Type: Liquid Propane
  • Application Type: Whole
  • 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

Also on our list of the best rated tankless water heater is the Bosch 830 ES LP Therm Tankless Water Heater. It comes with a unique heat exchanger design alongside a modulating temperature sensor that reduces propane consumption and maintains the flow of hot water. Manufactured by Bosch, one of the leading engineering companies in Germany, users can trust the effectiveness of this tankless water heater.

This is an ideal choice for medium to a large household as it is capable of 350F temperature rise at 8.3 GPM. It comes with 83% efficiency, making it worthwhile as it gives up to 30% savings on propane use. The energy star rating makes you qualify for some handy rebate from the government, with an overall BTU of 175,000.

The unit is pretty flexible and easy to install. It works only with stainless steel vents and can be mounted vertically or horizontally. Besides, it can be fitted anywhere in your home. This unit stands out as one of the best propane fired tankless water heater because of the very high warranty period, a whopping 15 years; hence, it is bound to last.

With a weight of 74 pounds, it measures 11.2 x 17.9 x 30.5 inches. The device also stand out because the unique patented heat exchanger is capable of getting rid of cold water sandwich from the pipes, helping the longevity of the entire unit.

PROS:
  • Freeze protection present
  • Electronic ignition
  • Energy star rated certified qualifies you for a rebate
  • Very long warranty period

CONS:
  • Quite an expensive devise

User Rating:

4.8 out of 5 stars (4.8 / 5)

  • Fuel Type: Propane
  • Application Type: Whole
  • Location: Outdoor
  • Btu: 10,300 – 199,000
  • Gpm: 9
  • Energy Efficiency: 83%
  • Size: 14 x 10 x 23 inches
  • Weight: 44 pounds
  • Display: Digital
  • Warranty: 12 year on heat exchanger; 5 year on parts

Still, in the series of our best-rated propane tankless water heater, we have the Rinnai RL94eP Outdoor Propane Tankless Water Heater. This is a whole house tankless water heater capable of giving out 9 gallons of water per minute. It is a high profile water heater with high efficiency with which it ensures a constant supply of hot water without sacrificing the temperature.

It is capable of giving out the temperature in the range of 98 to 1850F, making it fit for industrial and commercial purpose. It comes with a digital control panel which is easy to use, enabling you to set your desired temperature.

With a maximum capacity of 199,000 BTU, it is suitable for outdoor installation capable of giving up to 83% efficiency. Quite a number of users have expressed satisfaction with this unit. The unit is capable of supplying hot water to five outlets at the same time, with a flow capacity of 9.4 GPM. It weighs 44 pounds with a dimension of 14 x 10 x 23 inches.

PROS:
  • A high efficiency of 83%
  • Low energy cost
  • High flow rate
  • Recommended for a small and large house
  • Control panel is easy to operate
  • Long warranty period

CONS:
  • Installation is pretty technical
  • Users will have to wait a minute for the water to heat up

User Rating:

4.1 out of 5 stars (4.1 / 5)

  • Fuel Type: Liquid Propane
  • Application Type:
  • Location: Whole house
  • Btu: 109,260
  • Gpm: 4.23
  • Energy Efficiency: 85%
  • Size: 5 x 8 x 27 inches
  • Weight:30 pounds
  • Display: Digital
  • Warranty: 5 years

Finally on our best liquid propane tankless water heater review is Aquah Indoor Liquide Propane Gas Tankless Water Heater. This is wall mounted indoor tankless water, one of the best in the tankless water heater series by Aquah. With an incredible flow rate of 4.23 gallons per minute, it has an overall thermal efficiency of 85%

It features an automatic electrical pulse ignition system without an electrical accessory or standing pilot. With a great thermal input of 109,260 BTU, it can deliver hot water consistently, capable of over 45-degree temperature rise.

It comes in a beautiful white color, weighing 30 pounds with a dimension of 16.5 x 8 x 27 inches. The heater is accompanied by a free control device as well as a free AC adapter that can be powered by a 110V AC power supply. One of the things that make this tankless water heater unique even among the best rated tankless water heater brand is the ability to adjust the flow rate as well as the water delivery rate.

PROS:
  • A very easy installation process
  • Very efficient in fuel consumption as the propane tank last pretty long
  • Very affordable
  • Requires minimal installation space

CONS:
  • Water temperature could get excessively hot with low water pressure.

User Rating:

3.4 out of 5 stars (3.4 / 5)

  • Fuel Type: Natural Gas
  • Application Type: Whole House
  • Location: Indoor
  • Btu: 150,000
  • Gpm: 6.6
  • Energy Efficiency: 82%
  • Size: 9 x 8.8 x 23.6 inches
  • Weight: 49.8 pounds
  • Display: Digital
  • Warranty: 10-year on heat exchanger, 5-year on parts, 1-year on labor.

The first on our list of top natural gas powered tankless water heater review is Rinnai V65IN. It uses natural gas to heat water as it travels through the heat exchanger. It is a whole house unit, capable of supplying water to the laundry machine, dishwasher and shower all at the same time.

It comes with temperature control with which you can set your preferred temperature. This adjusts the temperature of the entire fixtures. It comes with various protective features such as leak detection water shut off as well as anti-frost protection. With this, you get a steady supply of hot water safely.

It is expected to last at least a decade as it comes with a ten years warranty, this gives assurance that Rinnai is really on top of its game. It can be installed anywhere indoor and used either as a whole hose unit or point of application. It requires a skilled hand for installation and does not require outside venting.

It weighs 49.8 pounds with a dimension of 13.9 x 8.8 x 23.6 inches. It has a maximum BTU of 150,000 and a maximum energy factor of 0.82.

PROS:
  • A steady supply of hot water for many faucets at a time
  • Extended warranty periods
  • Impressive safety features
  • The unit can be installed anywhere in the house
  • Quiet operation

CONS:
  • For homes with hard water, periodic flushing is important
  • Inability to adjust individual hot water faucet temperature

User Rating:

4.7 out of 5 stars (4.7 / 5)

  • Fuel Type: Natural gas
  • Application Type: Whole house
  • Location: Indoor
  • Btu: 360,000
  • Gpm: 5.3
  • Energy Efficiency: 82%
  • Size: 14 x 10 x 26 inches
  • Weight: 54 pounds
  • Display: Digital
  • Warranty: Parts  – 5 Years; Labor – 1 Year; Heat Exchange – 12 Years

Second, on our list of the top-rated tankless water heater powered by natural gas for use at home is Rheem RTG-64DVLN. This is a natural gas powered tankless water heater meant to solve the issue of hot water scarcity in your home. This is a pretty friendly tankless water heater that safely heats water to the preset temperature.

This device can give an impressive flow rate based on the temperature rise. Hence, you get a 6.8 GPM with a temperature rise of 350F and 5.3 GPM with a temperature rise of 450F. It comes with a UMC-117 remote control for ease of use, alongside a thermostat that helps in the regulation of water temperature.

Weighing 54 pounds, it comes with a dimension of 14 x 10 x 26 inches. It is a whole house tankless water heater that can handle two showers, the kitchen, and laundry at the same time. It requires a 3-Inch per 5-Inch concentric vent which requires no adapter at all.

PROS:
  • It is compact and saves space
  • Impressive safety feature – remote control
  • With the next generation burner technology, you can expect a continuous flow of hot water
  • Simple and effective ventilation that needs no adapter
  • Saves a lot of money because of the energy efficiency

CONS:
  • You might have to purchase some expensive additional accessories
  • A continuous supply of hot water might lead to wastage

User Rating:

4.1 out of 5 stars (4.1 / 5)

  • Fuel Type: Natural gas
  • Application Type: Single point
  • Location: Indoor
  • Btu:82,000
  • Gpm: 3.18
  • Energy Efficiency: 88.5%
  • Size: 4 x 4.7 x 25.4 inches
  • Weight: 29 pounds
  • Display: Led
  • Warranty: 10 years

Still in our series of the tankless water heater review is the Camplux 12L 3.18 GPM. This is an indoor heater produced by CAMPLUX, one of the top groups known for providing top quality home appliances. Over the years, Camplux has distinguished itself by building innovation, quality, efficiency, and portability into its product.

This product is ideal for the whole house and single point usage. It has a flow rate of 3.18 GPM and keeps hot water flowing when needed, with temperature ranging from 95 to 1490F.  It comes in a sleek design, a touch screen and LED display technology to display water temperature.

Giving out 82,000 BTU/hour, there are some safety features built into the device such as antifreeze protection, oxygen depletion safety shut off device, flame failure device, etc.  It has an impressive thermal efficiency of 88.5% with fully automatic temperature control.

The unit weighs approximate 29 pounds with a dimension of 14.4 x 4.7 x 25.4 inches. It comes with horizontal venting pipe for easy and quick installation.

PROS:
  • Very easy to install
  • Comes with necessary installation accessories
  • Impressive built-in safety features
  • An automatic temperature control system
  • Modern, trendy and sleek design
  • Safe electronic ignition

CONS:
  • Need to buy extra screws to keep it tightly hanged

User Rating:

5 out of 5 stars (5 / 5)

  • Fuel Type: Natural gas
  • Application Type:
  • Location: Indoor
  • Btu: 140,000
  • Gpm: 6.6
  • Energy Efficiency: 83%
  • Size: 6.7 x 13.8 x 20.3 inches
  • Weight: 37 pounds
  • Display: –
  • Warranty: 10 year heat exchanger and 5 year parts

Still, on the list of our residential tankless water heater review, we have Takagi T-KJr2-IN-NG. This is a highly efficient water heater with a maximum output of 140,000 BTU/hour. It is simple to install and requires venting (4-inch category three stainless steel). This is undoubtedly one of the most straightforward and cost-efficient natural gas tankless water heaters in the Takagi Family.

It is a multi-point of use tankless water heater; hence, can provide enough hot water for two or three bathrooms, with a maximum flow rate of 6.6 GPM. Users can expect an efficiency of 83% from this unit. Being the smallest water heater in the family, it is compact and can be installed anywhere in the house.

It comes with the necessary venting part required for fast installation such as the 4-inch termination kit, (combustible and noncombustible). It is an eco-friendly unit and saves energy considerably. It has thermostats embedded in the inlet and entry pipe; hence, you can keep tabs on the water temperature.

It weighs 37 pounds with a dimension of 6.7 x 13.8 x 20.3 inches.

PROS:
  • Very compact, can be installed anywhere inside without taking excess space
  • 83% efficiency
  • Presence of thermistors to keep water temperature constant
  • Installation is quick and easy

CONS:
  • A couple of users reported leakages issue

User Rating:

4.3 out of 5 stars (4.3 / 5)

Tankless Water Heaters Buying Guide

(Research has it that it leads to 27 to 50% fuel cost savings.) Over the past decade, we have seen the rise in a tankless water heater, and they have become more advanced as the years go by. This makes them a better alternative to the general method of heating water.

What are Tankless Water Heaters?

Also known as instantaneous water heater or on-demand type water heater, tankless water heater gives out hot water when needed only. It stands out from the storage water heater because water is not stored; hence, no energy loss, leading to a considerable saving in cost.

A typical family of four, with a hot water storage system, might battle to access hot water. This is because getting everyone to obtain water early in the morning might be near impossible. With the best tankless water heater, you can solve this problem. Since it does not reserve water in a tank, it does the heating directly as the water passes through the heat exchanger unit. This makes hot water available for everyone when needed.

How tankless water heaters Work

The top tankless water heater system available in the market all work based on the same principle. Whenever you need hot water, whether for a shower, for a washing machine or a faucet, cold water travels through the inlet pipe of the tankless water heater system.

Once the flow sensor of your tankless water heater detects water, either of these two happens, depending on the type of tankless water heater you have. The flame comes up and heats the heat exchanger, raising the temperature which transfers heat to the water as it travels through the stainless heat exchanger.

If you have the gas-fired type, when the flow sensor detects water traveling through the heater, it triggers the control panel which heats up the water. The control panel triggers the fan to come up which sucks in outside air. This opens the gas valve, bringing in gas which starts the burner.

As the water travels through the heat exchanger, it rises in temperature to the preset temperature. It comes out through the outlet pipe and is distributed through the house to the exact point where hot water is required.

Generally, the best rated tankless water heater gives out hot water at the rate of 2 to five gallons per minutes which translates to about 7.6 to 15.2 liters per minutes. Although, gas-fired tankless water heater gives out more water compared to the electric counterpart. However, bear in mind that the most significant gas-fired tankless water heater might not give out enough water for simultaneous use. This is common when you have to shower and another person using the dishwasher at the same time. In this case, we recommend having two tankless water heater installed. They can be connected in parallel to cater to multiple demands of hot water. In case you have appliances that use a lot of hot water, you can have a separate tankless water heater system involved for them.

A section below will discuss the various applications of the top-rated tankless water heater available.

How much can a tankless water heater save you?

While it is sure that tankless water does save you some cost, there is no simple answer to this. Many reports do vary on the amount that a tankless water heater does save. Energy Star, for instance, estimates a savings of $100 per year, while Consumer Reports declared that there is an average yearly saving of $75.

To estimate how much you are saving by using a tankless water heater, it should be in terms of the volume of water you use in your family. With this in mind, a large family that uses more water will save considerably compared to someone living solo which uses less water.

Additional Benefits of a Hot Water Tank System

If you have the best hot water tank system, you will surely get many advantages. More household today are already enjoying the amazing benefits that come with a tankless water heater. Besides, if you want an energy efficient home, consider installing a tankless water heater system. Unlike common units which continuously heat and reheat water to keep them at a high temperature, tankless water heater system give out hot water on demand either via electricity or gas.

While this demands more power, it stands out because the need to heat and reheat water is out of the question. Hence, in the long run, the best tankless water heater uses less energy. Consumer Reports revealed that gas-powered tankless water heaters are 22% more efficient compared to traditional water heaters.
Other then the obvious cost savings, we discuss some advantages of a tankless water heater below:

1. Higher Volume of hot water distribution

The idea behind the tankless water heater system is to make hot water available on demand. Hence, in a household, members can perform many activities requiring hot water at the same time. Two people can have a warm shower concurrently while another use the dishwasher.

There are applications of the best tankless water heater system that makes this possible. Besides, the idea behind the tankless water heater system is to make whatever volume of hot water needed available.

2. Tankless water lifespan

In general, a tank water heater usually comes with an average warranty of 8 years and could last up to a decade. With the best tankless water heater brand, you can expect it to last up to two decades even though they typically come with an average of 13 years warranty. Besides, it adds value to your home, a significant investment if you think long term.

3. Saves Space

Compared to the traditional water heater system, tankless water heater are smaller. They are usually mounted on the wall, which is generally out of sight like the basement. This space saving is a huge plus for small homes.

4. Tankless Water Heater Reduces Standby Losses

This is the significant advantage of a tankless water heater. A traditional water heating system will have to heat and reheat water to keep it at the preset temperature, ready for use. The constant heating and reheating translate to huge energy cost. Even with no one around, the heating and reheating process continues. With a tankless water heater, heating only takes place when you need water, saving energy and cost.

5. Access to Pure Water

As the year goes by, a traditional water heater gets old and is subjected to rust. This could contaminate the water, affecting the integrity of the water you get. With a tankless water heater system, you do not have to worry about this. You get clean water which is safe for drinking and other household chores.

6. Tankless Water heater could be Electric or Gas Powered

While most tankless water heaters are powered by natural gas, there are electric models as well. Hence, you have the liberty to chose the type you want based on the configuration of your home. Besides, the issue of rerouting gas line can be solved by a non-gas unit.

7. Tankless Water heater Comes with Huge Warranties

The best tankless water heater brand typically does have a longer life span. This, thus, translates to more extended warranties from manufacturers. In other words, the manufacturer will foot the bill should there be any significant repair or replacement. Warranties can be as much as 20 years since that is the average lifespan of a tankless water heater.

Downside to a Tankless water heater system

As exciting as the idea of a tankless water heater is, it is not foolproof. It does come with some downside. Hence, if you are nursing the idea of installing a tankless water heater system, be sure to go over these downsides to make an informed decision.

1.  Initial Cost

Since a tankless water heater system saves energy in the long run and is pretty durable, the initial outlay may be a disadvantage to some.. While the average traditional water heater is around $500 and can be less at times, the average tankless water heater is slightly more expensive depending on the size and household needs. Additionally installation cost also needs to be factored in which can stack up depending on the fuel type and layout of your household.

2. Need for Extra Accessories

For a tankless water heater to operate effectively, you need a water softener. This and much more extra equipment does add to the overall expenses. A softener also cancels the space-saving benefits of a tankless water heater because it is usually bulky, taking up extra space.

3. Rerouting Gas Lines

If you are going for a gas powered tankless water heater, there is a big chance you will need to reroute gas line. There might be a need for additional venting, all making the overall initial cost overwhelming.

4. The need for extra maintenance

The best rated tankless water heater comes with long warranties. However, for this to remain valid, users need to have an annual maintenance check. Alongside the need for a water softener, they are required to annually flush out the system to guard against the buildup of minerals in heater line. The cost of keeping up with this maintenance might cancel out the savings that come with the low energy requirement of the heater.

5. Making Up for the High price Tag could take years

Without a doubt, month to month water heating cost is significantly reduced. However, making up for the initial high cost might be a matter of years, which is an disadvantage for a short term household stay.

Fuel Types Available for Tankless Water Heater

For a tankless water heater system, they are powered by either of three fuel sources – electricity, natural gas or propane. However, the electric model is distinct from other types. The gas-powered types could either be propane or natural gas. The unit pretty much works in the same way, (transfer of heat to the flowing water through the heat exchanger) other than the type of fuel used.

Natural Gas Powered Tankless water heater

Gas powered tankless water heater are pretty expensive and also complicated to install. They require a complex vent system which gives the needed airflow required for combustion. It is pretty expensive because the existing ventilation system of the house might not be compatible, hence the need for some costly modifications to cater for the venting and gas requirements.
Gas price might be lower than electricity cost, depending on your location. With this, the overall operating cost of a gas powered tankless water heater is lesser than that of electric powered. Also, a gas powered water heater can deliver more power compared to electric type. As a result, it is ideal for large family size. One of the downsides is that gas powered tankless water heater requires way more maintenance compared to their electric counterpart. This is to ensure the proper performance of the unit and safe combustion of fuel. Besides, they need regular flushing due to the tendency of a mineral to build up.

Electric Tankless Water Heater

These are pretty much smaller than the gas counterpart and very easy to install. There is no need for ventilation since combustion doesn’t take place. These reduce installation cost, and also give flexibility regarding the position of installation. They are not complicated and can be installed anywhere.
An electric tankless water heater is pretty efficient compared to their gas and propane counterpart. This is due to the low amount of fuel it uses to boil water, which helps compensate for the high electrical cost. Due to the simplicity of an electrically powered gas heater; it does last very long, exceeding 20 years in many cases.

Liquid Propane Tankless Water Heater

To successfully run a propane tankless water heater system, you need adequate ventilation. This is important to let out toxic gases coming from the combustion chamber. This type of tankless water heater is recommended for places with a high demand for hot water.
On turning on the hot water tap of your house, the flow sensor detects incoming cold water which communicates to the Electric Control Unit (ECU). The ECU instantly transfers a signal via the connected sensor which activates the flow of liquid propane and starts the igniter. When the igniter starts, the heat exchanger transfers heat to the water pipe, and water absorbs enough heat from the heat exchanger.
On getting to the desired temperature, water flows out to whatever point it is needed in the house.

Different Application of Tankless Water Heater

The top tankless water heater brands also come in various types depending on the application of use. We have three major categories which are:
• Point of use application
• Multipoint application
• Whole house application

1. Point of Use (POU) Tankless Water Heaters

In distributing hot water from the tankless water heater to the faucet and point where it is needed, some heat loss occurs. To reduce this waste, one can improve the hot water distribution system. For homes already built, they can adopt simple energy saving measures like a low flow shower head, extra pipe insulation, etc. If you are constructing a house, you should take note of the way the pipes are installed and routed as it can reduce loses.
With the point of use tankless water heater, you get to reduce heat loss in the system. It is called “point of use” because the heating process takes place very near the place the water is needed like a sink or shower. With a Point of Use system, you get improved energy and get the increased temperature of water since the central heating system is far.
Point of Use tankless water heater systems is best considered during the construction of a home or when extra water load is required in a house. Generally, they are small and meant to serve a single point in the house. They are less expensive compared to whole house units and is recommended when the regular water is not enough to help the entire home.

2. Multipoint Application Tankless Water Heater

Households with no central heating system will find the multipoint tankless water heater system beneficial. They are very efficient and supplies hot water for your tap, shower and laundry needs when required.
At best, multi point tankless water heater will supply hot water for your taps and showers.

3. Whole-House Tankless Water Heater Application

Whole house application does have a higher flow rate; hence, they can effectively handle excess hot water demand of the entire house. For instance, a unit could be designed to serve two laundry machines, the shower, a kitchen sink, etc. It uses various fixtures different house fixtures use a varying amount of water. This explains why the laundry could use four times more water than the kitchen sink.
Since the whole house application serves the entire house, they are pretty expensive than a point of use application.

How to Select a Tankless Water Heater

There are many factors to put in mind before selecting a tankless water heater system. Due to the initial investment cost and the complexity of a tankless water heater system, it is recommended to get some things right before going to the market in search of the ideal tankless water heater system.
We will discuss some of the most important things to keep in mind before making a choice.

1. Fuel type

Above all, the fuel type is the most critical factor you have to focus on before selecting your tankless water heater. Top rated tankless water heater comes in various types depending on the fuel size. It can either be powered by electricity or natural gas.

Electric Powered tankless water heater Requirements

There are basic requirements that your house must meet to be able to run an electric tankless water heater effectively. Some of these requirements are:

  1. Voltage: tankless water heater ranges from 110V to 277V with many units in between.
  2. Amperage: Depending on the brand, its amperage requirement varies. However, be sure that the tankless water heater you are going for can be supported by what your electrical household unit supplies.
  3. Circuit breaker: Due to the electrical power demands of the tankless water heater, we recommend having a separate circuit breaker for your tankless water heater. If this is not feasible, be sure that your circuit is powerful enough to handle the demands of the tankless water heater.

Gas Powered tankless water heater Requirements

There are basic venting requirements for a gas-fired tankless water heater. Be sure to put this in mind if you are going for a gas-fired tankless water heater.

i. Type of Gas:

Since gas powered tankless water heater can either be propane or natural gas powered, decide which one you want. However, you need to ensure that the present gas supply of your residence can serve the need of your gas-fired tankless heater. This is important to have a unit that operates effectively.

ii.Venting requirements:

Since tankless water heater comes in various size and brands, their venting requirements differ. Before going to shop for the venting accessories of your gas-fired tankless water heater, be sure to keep a couple of things in mind.
a. We recommend, for your gas-fired tankless water heater, Category III stainless steel (UL1738 certified) venting. “Type B” is a no-go area
b. Access the local building code. This is to help ensure that all specific needs will be met.

iii.Access the Venting Needs:

Since most tankless water heater does come with venting kits, we advise that you access the requirements of your tankless heater system unit to be sure that you will have all necessary accessories. It is pertinent to note that the chances of a premade kit meeting your need are pretty slim, depending on the point of installation.
With this in mind, you want to know the dimensions of the vent route as well as the path of the discharge through the ceilings or walls. You should also take note of clearance and access to air for the combustion process.

All in all, bear in mind that for a gas tankless water heater system, you might need some electrical connection as well. Hence, make sure you are cleared on the requirements of the unit you want to buy to make sure you can accommodate the demand.

2. Location and Mounting Space

One of the advantages and most persuasive selling point of the tankless water heater is that it can be installed anywhere. They are usually small in size; hence, do not require a large area. They can fit perfectly in closets, pantries, under the stair, under the sink and other storage spaces. You, however, need to follow some requirements for you to be safe when choosing the location and mounting area for your tankless water heater.

Bear in mind that tankless water heater is designed for indoor and outdoor installation only. It is best to install them outside provided rain, splash water, direct sunlight, insect, pets, and debris will not come in contact.

Be careful not to install the unit where it can be subjected to freezing temperatures easily. The system might experience severe damage should the water in the tankless water heater freeze. This could void the warranty. Avoid turning the system on should you suspect that the water in it has frozen. Instead, have a thorough inspection or contact the manufacturer to inspect for leaks.

Before selecting the mounting location, it is essential to consider the current plumbing configuration of the entire house. In other words, find the location of the main electrical panel, the location of the laundry room, the bathroom and kitchen etc. With this in mind, we recommend choosing a position where you would not have to make significant plumbing changes.

The location should be close to your main electrical panel to reduce the number of wires you will need for installation. It should also close be close to the points of hot water application that you often use like the shower. This is necessary to reduce the distance the water has to travel from the heater to the point of use, reducing heat loss.

It is also important to bear in mind that there will be a need for future maintenance operation. As a result, the location of the tankless water heater should be easily accessible.

Above all, it is important to locate your tankless water heater in a place far from any combustible material. It will be a disaster for any combustible material to come in contact with either the outlet water pipe or the water heater system. As a rule of thumb, keep flammable material at least 24 inches away from the entire unit – both the heater and the output pipe.

Also, the location should be such that it is out of reach of kids or pets. This is to prevent them from sustaining unnecessary injury due to curiosity. The outlet water pipe could be very hot, and kids might want to touch it.

3. Size and Demands

Step 1. Application

The best tankless water heater brand comes in various applications. So make sure you determine whether you need a single point, multi point application or whether you its for your household.

The top tankless water heater available in the market are rated based on the maximum temperature it gives at a particular flow rate. Hence, in determining the size of your water heater, you need to know the flow rate as well as the temperature you need at various points in your house.
In determining the size, the following steps can come in handy:

Step 2: Determine the total flow Rate

You need to know the maximum number of the device you want to run on the heater as well as the overall flow rate. Add up the entire flow rates – this gives the desired flow rate you want from your tankless water heater.

For instance, let’s assume you will run a shower head with a flow rate of 2.4 gallons per minute with a laundry system of the flow rate of 1.7 gallons per minute. Your tankless hot water system should have a flow rate of at least 3.20 gallons per minutes.

Step 3: Calculate the required temperature Rise

To have the temperature rise, you need to know the desired outside temperature. You will subtract the influx of water temperature from the desired temperature rise. As a rule of thumb, unless otherwise identified, assume the influx water temperature is 50F. A low heat ensures you do not undersize your device.

For residents of a warm climate, you will have incoming water temperature at a pretty higher temperature. However, the outlet water temperature is usually around 100 to 1100F. In this case, your tankless water heater will give a temperature rise of around 550

Step 4: Practical Sizing Example

Let us assume your average shower gives out an average temperature of 950 and uses 3.0 gallons of water. Assume as well that the inlet water temperature is 350, and you want enough water to run two showers simultaneously, what temperature rise and tankless water heater will you need to accomplish this?

Solution: the incoming water temperature needs to be raised from 350 to 950, and you should be able to heat at least 6.2 gallons of water. With all these parameters, you will need a tankless water heater that can give a minimum of 600 temperature rise at 6.2 gallons per minute.

Determining the Flow Rates

The knowledge of the amount of water you need is pretty much essential. Do you have to a shower and use the laundry simultaneously? With the chart below, you can get the range of water usage as well as the average water temperatures for each faucet

Fixtures Average Flow (GPM) Average temperature (Faharient)
Tub 4.0 102
Shower 2.5 – 3.0 104
Washing machine 2.0 120
Dishwasher 1.5 110
Kitchen Sink 1.5 110

 

For instance, if you are running three showers at the same time, you will need 7.5 gallons of water per minute. Also, if you are running a dishwasher and a tub, you will need 6.0 gallons of water per minute from your tankless water heater. Whatever the case, your aim should be getting a tankless water heater that can meet and possibly exceed your need.

 

What to do if the largest tankless heater cannot meet all your needs?

There are instances where people living in huge houses might not find the right size of the tankless water heater to serve them. People living in mansions, for example, might not be lucky to get a tankless water heater that can cater for the entire household.
For people in this category, we recommend linking several tankless water heater into a single unit. This can give out enough hot water so that everyone in the house or building is catered for.
A perfect example is the Noritz multi-system. This unit can contain as many as 24 tankless water heaters, which can be programmed to a single controller, so the entire system works as a single unit, making sure every point of use gets hot water.

How much will it cost to install a tankless water heater?

The total installation cost can be between $700 and $2500+ to install a tankless water heater.

Installing a tankless water heater do require various accessories like two-piece lead-free brass valve set, gas connector kit, a termination vent kit, mounting hardware, etc (which is all considered .

Labor, as well as the specific heating equipment used, are the critical cost factor that affects the installation cost of a tankless water heater. If you hire a professional, expect to pay either a flat rate or an hourly rate. A plumber might charge you between $45-$150 per hour.

It does NOT have a fixed price since tankless water heater varies in size, type, flow rate and capacity. Also the location that your installing it in and what is required from house to house is different but the above range is sure to cover most houses.

Conclusion

It is pretty obvious that a tankless water heater is an esssential investment to make for most households. It solves the problem of hot water scarcity and ensures you get water at its purest form, saving you money and space.

We have invested long hours of research into this best tankless water heater review hence, you can trust out judgment. No matter the initial price of the tankless water heater you go for, they are bound to last for years, paying for itself over the years.

Bear in mind, however, that the best choice for you is a matter of your specific need and your rate of hot water consumption. Be sure to follow our recommendation and you will be guided in making an informed decision, one you will be glad you did!