Best Water Heater (Most Efficient Water Heater Reviews)

Updated on December 1, 2020 by Christopher J. Crown

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The water heater is an essential need in the cold weather. We usually use hot water for a shower, washing clothes and dishes and other purposes. We often think about which water heater will suitable for us. But there are hundreds of water heater in the market and it very hard to select the best water heater. Therefore, in this article, we will guide you about the best water heater. We will cover all the commonly used types of water heater and their features, pros, and cons which will help you to get the best water heater.  We have listed the top 10 best water heater in this article for your ease. The features, benefits, pros, and cons are mentioned for every product.

Top 15 Most Efficient Electric Water Heater

Camp Chef Triton Water Heater​

Camp Chef Triton Water Heater
Price$ $ $
Dimension23 x 13.4 x 8 inches
Weight14.6 pounds
Heat Output34,000 BTU
Capacity1.5 Gallon/min
Power SourcePropane

Stiebel Eltron Tankless Water Heater​

stiebel Eltron
Price$ $ $
Dimension4.6 x 16.6 x 14.5 inches
Weight19.6 pounds
Watt18000 Watt
Capacity3 Gallon/min
Power SourceElectricity 220-240 Volt

Eccotemp Tankless Water Heater​

Eccotemp Tankless Water Heater
Price$ $ $
Dimension5.4 x 2 x 88.8 inches
Weight27 pounds
Heat Output74,500 BTU
Capacity3 Gallon/min
Power SourcePropane

Ariston Electric Water Heater​

Ariston Electric
Price$ $ $
Dimension13.8 x 13.5 x 13.8 inches
Weight23.1 pounds
Watt1500 Watt
Capacity4 Gallon/min
Power SourceElectricity 110-120 Volt

Rinnai Tankless Hot Water Heater​

Rinnai RL Series HE
Price$ $ $ 
Dimension14 x 10 x 23 inches
Weight44.3 pounds
Heat Output10,300 BTU
Capacity9.4 gallons
Power Source12V Battery And Propane

Titan Electric Tankless Water Heater​

Titan SCR2 N-120 Electric Tankless Water Heater
Price$ $ $
Dimension12 x 10 x 5 inches
Weight2 pounds
Capacity0.5 Gallon/min
Power SourceElectricity 220 Volt

Suburban Water Heater​

Suburban Water Heater
Price$ $ $ 
Dimension19.2 x 12.6 x 12.6 inches
Weight4.41 pounds
Capacity6 Gallons
Power SourcePropane

Ariston GL6+S Electric Mini

Ariston GL6+S Electric Mini-Tank Water Heater
Price$ $ $
Dimension14.5 x 17.5 x 17.5 inches
Weight35 pounds
Watt1500 Watt
Capacity2.5 Gallons
Power SourceElectricity 110-120 Volt

Rinnai Gas Water Heater​

Rinnai V Series HE Tankless Hot Water Heater
Price$ $ $ 
Dimension13.8 x 6.8 x 20.9 inches
Weight47.4 pounds
Capacity6.6 Gallons
Power SourcePropane

Eccotemp Water Heater​

Eccotemp Water Heater
Price$ $ $ 
Dimension13.7 x 25 x 5 inches
Weight28.9 pounds
Capacity4 Gallons
Power SourcePropane/Electricity

Marey Gas Tankless Water Heater​

Marey Power Gas 10L 2.7 GPM
Price$ $ $ 
Dimension6.9 x 13.6 x 23.6 inches
Weight21 pounds
Capacity2.7 Gallons
Power SourceLPG

Rheem electric Tankless Water Heater​

Rheem electric Tankless Water Heater
Price$ $ $ 
Dimension4 x 15 x 19 inches
Weight8.5 pounds
Capacity4.4 Gallons/min
Power SourceElectricity 220-240 Volt

ECOTOUCH Electric Tankless Water Heater​

Price$ $ $ 
Dimension15 x 10.4 x 4.9 inches
Weight6.6 pounds
Capacity1.5 Gallons/min
Power SourceElectricity 220-240 Volt

Marey ECO110 220V Water Heater​

Marey ECO110 220V
Price$ $ $ 
Dimension3.1 x 7.5 x 10.8 inches
Weight7.5 pounds
Capacity1.3 Gallons/min
Power SourceElectricity 220-240 Volt


We have also mentioned all the types of best water heater to guide you about their importance and working. The Buyer’s guide in this article will guide you about the features and importance of the features of electric, natural gas, and propane heaters. To ensure the good life of the water heater, we have written precautions for all kinds of water heaters. The precaution section contains the do’s and don’ts for the specific heater. You will also see the benefits of the best water heater in this article. There is a frequently asked question section in the end that will help you answer your questions precisely. Let’s start with our top 15 product list.

1. Camp Chef Triton Water Heater-Camp Chef HWD5​

Camp Chef Triton Water Heater

Camp Chef HWD5 is a tiny heater but it can deliver 1.5 gallons of hot water per minute. You will get enough instant hot water to take a soothing shower. It has a burner knob to control the temperature and water knob to control the flow of water. Its easy control allows you to change the temperature from 80˚F-150˚F. You can select four shower settings which are the jet, shower, off and mist. The flame lights automatically as you turn on the faucet or shower and extinguishes after closing the faucet, which saves your fuel cost. It requires an LP tank to work and that can be connected via hose easily. It is very lightweight and with a carry handle to carry in case of home shifting. The manufacturer offers a one-year limited warranty for the product.

2. Stiebel Eltron Tankless Water Heater​

tiebel Eltron

It is a 24,000 watts (24kW) electric heater which takes little space. It is very silent in operation and will not disturb you at all. There is no emission of harmful gases; therefore, no ventilation is required. It has an LED display on its front to set the temperature accurately. You can easily adjust the temperature range from 86˚F-140˚F by adjustment knob. It is energy-efficient with 0.99 energy factor; hence, it will save your energy cost. It can provide 1.5GPM (Gallon per minute) at 92˚F which is enough for a shower. The pre-set temperature buttons allow you to select the appropriate temperature quickly for shower and faucet. It is safe to use and certified by ANSI, UL, and other safety organizations. It is durable and the company offers a 7-year leakage and 3-year parts warranty.

3. Eccotemp Tankless Water Heater​

Eccotemp Tankless Water Heater

Eccotemp L10 is a liquid propane gas (LPG) heater that is suitable for outdoor use. It provides 74,500 BTUs and 2.6 GPM (Gallon per minute) for instant use. It is lightweight, compact and suitable for camping; hence, it is portable and can be taken anywhere. The safety shut-off timer shuts off the heater after 20 minutes to avoid overheating. Its body is made of stainless steel which will not undergo rusting. You can use it in power outages as it does not require electricity, even the automatic ignition is also powered by batteries. The temperature can be adjusted in the range 50˚F-140˚F by the adjustment knob. It also has a flow control knob to adjust the water pressure according to requirements. There is a weather-proof rain cap that can be removed as well. The heater comes with a one-year limited warranty with terms and conditions.

4. Ariston Electric Water Heater​

Ariston Electric

This is a tiny tank heater that can store 4-gallons of water which is enough to provide instant hot water for a sink. It is very easy to install and requires a little space. There is no ventilation system required. It can either be mounted on a wall or placed on the ground as well. It consumes 1500 watts to meet your hot water requirement. With its temperature adjustment knob, you can adjust the temperature from 65˚F-145˚F. Its sensing probe can adjust the temperature quickly and maintain the temperature consistently. It just only requires a 120V wall socket and water connections. There is no need to install a separate high amperage wiring as it can work on a 15A dedicated circuit. It also has a pressure relief valve to release the pressure and avoid any loss. The manufacturer offers a 6-year limited exchanger warranty and 1-year parts warranty.

5. Rinnai Tankless Hot Water Heater​

Rinnai RL Series HE

This heater runs on natural gas and provides hot water at high efficiency. It can provide up to 9.4 GPM (Gallons per minute) of hot water instantly which is enough for your home. It has an LED display and buttons to set the temperature accurately. The Wi-Fi feature can monitor the heater functions remotely. It can provide instant hot water to up to six fixtures at your home. Its energy-saving technology can save up to 40% of the energy. You can easily mount it on the wall and it requires less space as compared to tank-type water heaters. The recirculation technology of the heater circulates the water to get hot water instantly. It is safe to use at home and approved by SCAQMD. The manufacturer offers a 10-year warranty for the heat exchanger and a 5-year warranty for parts.

6. Girard RV Tankless Water Heater​

Girard RV Tankless Water Heater

Girard 2GWHAM is an LPG water heater that is specially designed for RVs. It gives 42,000 BTUs to provide you with instant water. It does not produce any noise while operating due to its silent brushless DC motor. You only need to connect it with a 12V battery for operation. It has an LED on its control board that indicates the low voltage. The average water flow of the heater is 1.4 gallons per minute which are enough for an RV. You can set the desired temperature from the user control panel from 95˚F-124˚F accurately. The LED display of the user control panel shows the temperature. For safety purposes, the heater turns off automatically after 20 minutes of usage. It does not have any tank, so you don’t need to flush it every year. It has a two-year limited warranty as well.

7. Titan Electric Tankless Water Heater​

Titan SCR2 N-120 Electric Tankless Water Heater

This is an 11.8kW tankless water heater that needs 220V to operate. It can provide 4 gallons per minute which is suitable for two bathhouses. It will provide you with instant hot water without any waiting. The flame lights only when the water is required and extinguishes automatically. It can save your energy up to 60%; therefore, it will cut off your bill. Its quite operation will not disturb you. It has an electronic temperature adjustment control with two buttons to set the temperature. The simple LED lights on the display provide information about the current water temperature. It is very easy to install but requires time, you just need to set the water inlet and outlet pipes, and electricity supply. For proper operation and safety, it should have a 60A circuit breaker. It does not emit any kind of gases; therefore, there is no need for a ventilation system.

8. Suburban Water Heater​

Suburban Water Heater

Suburban 5117A is an LP heater that can be easily fitted in RVs. It has a 6-gallon tank to store water for normal use. The pilot ignition allows you to ignite the flame manually when you need it. It can provide you with hot water in the power outages as well. The tank is made of porcelain steel which avoids corrosion. Further, there is an anode rod that can protect the tank from corrosion and undergoes corrosion itself to save the tank. You can also replace the anode rod easily.

The tank is insulted by foam that keeps the water hot and reduces the heat exchange with the environment. You don’t need any extra wire to connect it, it can be easily connected with the wires of your old heater. It has a universal size that can be fitted in all RVs. The manufacturer offers a two-year limited warranty as well.

9. Ariston GL6+S Electric Mini-Tank Water Heater

Ariston GL6+S Electric Mini-Tank Water Heater

This is a mini heater with a 7-gallon tank which is good for small houses. It is very easy to install, even you can install it on your own. You can either mount it on the wall or it can sit on the floor as well. It can serve one or two sink faucets. It consumes 1500 watts and requires only a simple 120V outlet without the need for any external wiring. The compact design saves you space and allows easy use. It saves your venting cost as well because there is no emission of gases. It has a temperature control know to set the desired temperature. The tank of the heater is well insulated and leakage resistant which provides long-life to the heater. It has a 6-year limited heat exchanger warranty and a 1-year warranty for parts.

10. Rinnai Gas Water Heater​

Rinnai V Series HE Tankless Hot Water Heater

This compact heater does not have a tank, but it can provide 6.5 gallons per minute. This heater can be controlled and monitored by the mobile application which works on Wi-Fi signalling. It has a low running cost because it uses natural gas at a very high efficiency which saves 40% of the energy. There are no controls on the heater, you can control the temperature remotely from the application. It does not require batteries for ignition as it uses 110V for that. This will provide enough instant hot water for your whole family. It is very easy to install, and it needs to be installed outdoor only for ventilation. Its size is just like a small suitcase; therefore, it takes a little space. The company offers a 10-year heat exchanger warranty and 5-year parts warranty.

Buyer’s Guide

There are hundreds of water heaters in the market; therefore, it is hard to pick the best water heater. Therefore, we are going to give a Buyer’s Guide that will help you to choose the best water heater according to your requirements. We will try to list down the features of the water heater that you should see while buying any water heater. Not all heater will have all the features and you may need to compromise on some features that are not much important to you. For example, if you want to install a water heater at your home, then the portability of water heater might not be important to you because you don’t need to move it. So, here we will discuss the features, functions and all aspects of the heater that you need to know about the heater.

To make the Buyer’s guide beneficial for you, we will define the features of the water heater according to its fuel type. Therefore, we are going to split this Buyer’s Guide into two parts. One will discuss the aspects of electric heaters and the other will deal with the aspects of Natural gas and propane heaters.

Buyer’s Guide for Electric Heaters

In this section, we will go through all the features, functions and other aspects of the electric heaters. This will help you to buy the best electric heater. The important things that you need to see about the electric heaters are,

  1. Energy Consumption
  2. Required Voltage
  3. Wiring and Current
  4. Adjustable Thermostat
  5. LED Display
  6. Pressure Control
  7. Wi-Fi monitoring
  8. Dry-heating Protection
  9. Child-Lock
  10. Over-temperature protection
  11. Efficiency
  12. Ignition System
  13. Water Flow

Energy Consumption

The energy consumption of the electric heater depends on the wattage of the heater. The higher the wattage, the higher will be the energy consumption. The energy consumption also depends on the hours of use as well. You can easily calculate the cost energy consumption of the heater using the wattage and hours of use.

The steps for calculating the cost of energy consumption are,

  • Multiply the kilowatts with the hours of use. If the power is given in watts, then you can convert it into kilowatts by dividing it by 1000.
  • Now multiply the answer with the cost per unit of the electricity.

For Example: There is a water of 10kW and you use it three hours a day. The cost per unit is $0.2. You can calculate the cost of energy consumption as,

Energy consumed = 10 x 3 = 30 kWh

Energy cost = 30 x 0.2 = $6

Hence, you will have to pay $6 for 3 hours of use.

In this way, you can calculate the energy cost and consumption by the wattage of your heater and hours of use.

Required Voltage

Every electric heater requires a certain voltage level. The most common voltage levels of the heater are 120V and 240V. Before inserting the plug into the wall socket make sure to read the voltage required for the electric heater. If the voltage is not as the voltage at your home, then ask an electrician to install the required components and wiring. For example, if your heater requires 240V to run and the voltage level at your home is 120, then never use the heater on 120 wall sockets. Call an expert electrician.

Wiring and Current

The wiring of the heater depends on the amount of current it draws. The manufacturing company usually recommends the size of wiring. You need to install that recommended wiring which will be dedicated to the heater. You need to install the recommended circuit breaker as well for safety purposes. The wiring should be capable of bearing the electric which will pass through it. Otherwise, the wiring will heat up and cause a short circuit in the worst cases.

Adjustable Thermostat

The thermostat of the heater controls the temperature automatically. It is responsible for maintaining the desired temperature. Some heaters have a knob to set the desired temperature and some heaters have electronic circuits to change the temperature. You can easily adjust the temperature via the adjustment knob. In some heaters, there are two arrow buttons to set the desired temperature. If there is an LED display with the thermostat, then you can adjust the temperature more accurately and precisely.

LED Display

The LED display shows the temperature of the water. It shows the temperature while adjusting it. With its help, the user can control the temperature without any error. It also displays the error code in case of any abnormal situation.

Pressure Control

The pressure can be controlled by the control knob in some heater. There may be different showering options on the shower handle as well.

Wi-Fi Monitoring

Wi-Fi monitoring is available in modern heaters. The heater is connected via Wi-Fi and the application is for the monitoring and controlling purpose. It allows you to control the heater remotely. The temperature can be adjusted through the application and the timer as well. The heater which has this feature may not have any buttons on it.

Dry-heating Protection

The dry heating protection is mandatory for the tank type electric heater. The heater cannot be turned on if it is empty. It needs to be filled first before starting the heater. Otherwise, the heater may burn out. So, this protection saves the heater from any accidental start of an empty heater. It saves the heating element and the heater as well.


The hot water from the heater may burn the skin, so it is necessary to avoid keep children away. The controls of the heater should be away from the children as well. Some heaters have a child lock feature that protects from the misuse of the heater by children.

Over Temperature Protection

There is a probability of over-temperature in water heaters. This may cause overheating of the water which is harmful to the skin. Therefore, to avoid this problem there is over-temperature protection in some heaters. This feature shuts off the heater in case of overheating.  


The efficiency of the heater informs about the conversion of the electrical energy into heat energy. The more the efficiency the lesser will be the losses. For example, if a heater has an efficiency of 98%, then the heater converts the 98% of the electrical energy into the heat and energy and only 2% of the energy is lost. If the heater has a good efficiency over its useful life, then the amount of your electricity bill will be lesser as well.

Water Flow

The water flow of the heater informs you about the availability of the hot water per minute. For example, if the water flow of your heater is 4 GPM (gallon per minute), then it will provide 4 gallons per minute. The hot water flow also depends on the temperature as well. The higher the temperature, the lower will be the water flow. Further, the inlet temperature also affects the water flow. If the required rise in temperature is less, then the flow will be higher.

Some heaters may have a small tank in them. They can provide hot water which is present in the tank. After using the water in the tank, the heater will take some time to heat the incoming water.

Buyer’s Guide for Natural Gas and Propane Heaters

Now, in this section, we will learn about the Natural Gas and Propane heater. We will target all the important things that you need to know. We will discuss,

  1. Ignition System
  2. Ventilation System
  3. Portability
  4. Temperature Adjustment
  5. Pressure Adjustment
  6. Gas Leakage Protection
  7. Usable for Power Outages
  8. Wi-Fi Monitoring
  9. Child Protection
  10. Efficiency
  11. LED Display
  12. Water Flow

Ignition System

Most modern systems use an automatic ignition system that can ignite the flame when required. To ignite the flame automatically heaters use cells or electric supply. Heaters for houses usually have an automatic ignition system. In some RV heaters, you need to ignite the flame manually when required. The automatic ignition system saves energy because it only ignites the flame when the hot water is needed. It cuts off the electricity bill of your home.

Ventilation System

Gas and propane heaters emit gases that are not safe and that should be expelled outdoors. The ventilation system expels harmful and unwanted gases. Usually, the indoor heaters have a ventilation chamber on their top and that needs to be connected to outdoor with a vent pipe. Outdoor heaters do not need any kind of ventilation because we use them outdoors. The emission to the outdoor is natural in such heaters.


Some propane heaters are portable, they can be used in the outdoors on trollies as well. Natural gas heaters are not portable, they are fixed inside the house. Portable heaters are useful for camping traveling and RV living.

Temperature Adjustment

This feature is present in almost all types of heaters. There can be an adjustment knob to set the desired temperature. In some heater, here is an electronic control circuit for the adjustment of temperature which is very accurate and easy to use.

Pressure Adjustment

The pressure adjustment knob is present in some heaters to adjust the pressure of output water. It is not a mandatory feature because the showerhead or faucet can control the water flow.

Gas Leakage Protection

Gas leakage protection is very important in these heaters. This feature allows the heater to protect from any kind of internal gas leakage. Some heaters can detect leakage if it happens in the heater.

Usable for Power Outage

These heaters run either on natural gas or propane, but some heaters require electricity as well for ignition and temperature control. These heaters cannot work in power outages. Modern heaters require electricity. Some heaters use cells for the ignition, and they do not require any external electric supply. Therefore, you can use those heaters in emergencies.

Wi-Fi Monitoring

Just like electric heaters, there can be a Wi-Fi feature in these heaters as well. The heater can be connected to a mobile application via Wi-Fi and the application has controlling options and monitoring features. This feature allows easy and remote control of the heater. You don’t need to use the buttons of the heater. You can easily set the desired setting on while lying on your bed.

Child Protection

Child protection is in some heaters and it locks the control panel so that children may not change the settings.


The efficiency of the gas and propane heater is slightly lower than the electric heaters. There is a possibility of heat loss in the heat exchange or during the emission of gases.

LED Display

It is for the purpose of showing and setting the temperature. It shows the temperature precisely.

Water Flow

Water flow is given in GPM (gallons per minute). You can guess how much water you will get from the heater. It will tell you how much faucets or showers you can connect with the heater.

Precautions for Electric Water Heater

You should know about the precautions of an electric water heater. By knowing the precautions, you can take care of your best water heater. This will also save you from problems and ensure the life of your best water heater. So, the precautions for the electric water heater are,

  1. Breaker and Wire Size

Water heaters consume a lot of electricity which is a way more than the other appliances at home. Therefore, they require a special kind of electrical protection and wiring a well. Normally the manufacturing company recommends the size of the circuit breaker and the wiring to the user. You should install a dedicated wiring and circuit breaker as per the recommendation of the company. This will ensure the long life of your heater and safety. Otherwise, the wiring will heat up and may cause the melting of insulation. You should call an expert electrician to install wiring and circuit breaker.

The circuit breaker can save your heater and electrical wiring in case of any short circuit. Therefore, never avoid a circuit breaker, it is essential for safety purposes.

  1. Earthing of the Heater

The heater must be earthed properly. It saves you from any electrical shocks which may cause fatality. In case any live wire is in touch with the outer body of the heater, then it can give you a shock. But, if your heater is earthed properly, then the current will not pass from your body, it will pass through the earthing wire instead.               

    iii.  Check for any Leakage

After connecting the water inlet and outlet pipe, check for the leakage. Make sure that there is no leakage. The leakage can cause corrosion and a short circuit as well. Check the connection joints properly.

  1. Shut off the Heater for Maintenance

For maintenance, you should shut off the heater first. Take out the plug from the wall socket as well. If you will try to do maintenance while the heater is running, then there is a high probability of getting an electric shock.

  1. Place of Usage

The heaters are designed for indoor and outdoor use. Mostly the electric heaters are designed for indoor use only. So, do not try to use where it is not recommended.

  1. Keep Children Away

Water heaters provide hot water that can cause skin burns. Therefore, you need to be vigilant in the case of children. Keep them away from the hot water faucet. Further, you should install the heater at the place which is out of the children’s reach. They can change the settings accidentally or deliberately. In the case of electrical problems or any misuse, there is a probability of getting an electric shock.

Precautions for Gas and Propane Heater

Gas and propane heaters require different types of attention; therefore, we will discuss here their precautions to ensure the long life of your best water heater. The important things that you need to care about are,

  1. Use of Right Fuel

The fuel of the heater is always mentioned on the box or user manual. You should use the recommended fuel only. Never try to experiment with other fuels because the heaters are specially designed for certain fuel-type.

  1. Gas Leakage

After the installation of the heater make sure that there is no leakage and you can check for leakage by applying soap and water solution. If you see any bubbles after applying the soap and water solution, then there will be leakage. Fix this leakage to ensure safety.

If you smell any gas during the operation of the heater, then get out of your home immediately and call an expert. Do not try to find the cause and avoid the usage of any appliance. Get out from your home immediately and leave the door open for ventilation. It is better to install gas leakage detectors for safety.

iii. Ventilation

Gas heaters require a ventilation system. They emit gases that should be expelled outside. These heaters have a venting chamber and you need to fix a vent pipe to this chamber. This will take out all the gases from the heater. Check the vent pipe for any obstacle at least once a month.

Some outdoor heaters may not require any external ventilation system. They have a natural ventilation feature; therefore, they can emit gases outdoor easily.

  1. Hot Water

The hot water of the heater can damage your skin. Elders and children should be kept away. Use low-temperature settings such as 120˚F for normal use. Only increase the temperature when required and be vigilant when the temperature of the water is high.

  1. Place of Usage

These heaters are designed for either indoor or outdoor use. Use the heater as described by the company. An indoor heater may not work properly outdoors.

  1. Don’t Leave Unattended

Don’t leave the heater unattended and always shut off the heater when you are going out from your home.

Types of Water Heater

To buy the best water heater you should know about the types of water heaters. Therefore, we are going to discuss the types of water heaters. The water heater can be classified on the following basis,

  1. Fuel-type
  2. Tank


Water heaters work on various types of fuels. The types of heaters based on fuel types are,

Electric Water Heaters

Electric water heaters require electricity to work. These heaters require only a 120V or 240V wall socket to run. For this purpose, some heaters may require special wiring and circuit breaker for safe and long term operation. Electric heaters do not emit any kind of gases; therefore, they do not require any ventilation. This is the reason due to which they take less space and they are easy to install. There is no risk of gas leakage as well. These heaters are very efficient, and they can save your energy cost. They do not require batteries for the ignition systems. The running costs of these heaters are high because they cost per unit of electricity is high. You should check the wattage of the heater to know about energy consumption.

These heaters should be installed by an expert and certified electrician because there is a high risk of electric shocks. Electric heaters in RVs can even be used during the travel as there is no flame or ignition in these heaters.

Natural Gas Heaters

Natural gas heaters are usually used in homes. These heaters have a very low running cost as compared to the electric heaters. But the upfront cost of gas heaters is more than electric heaters.

Natural gas heaters emit certain gases and for that ventilation system is necessary. So, they need a special ventilation system that expels gases. Moreover, new models of gas heaters do not require any kind of manual ignition. They light the flame automatically without the need of a match stick. For ignition, small batteries (commonly D size batteries) or electric supply is needed. These heaters are not portable, and they are not for outdoor use as well. If the heater does not use any electricity supply, then it can be used in an emergency.

Some natural gas heater requires 120V or 240V to work. They require it for controlling and ignition. But they only require a little amount of electricity. The automatic ignition in the modern heaters allows them to ignite the flame when the heater is in use only. This saves the energy cost and cuts off your bill.

Propane Heaters

Propane heaters use propane to work. You need to install a tank for the purpose. Some of these heaters are specially designed for outdoor use. They can be taken for camping and traveling. They are portable and you can get a propane heater for your RV as well.  There are propane heaters for home as well, but they require a ventilation system. Some heaters can expel the gases naturally when they are used outdoor. The portable heaters use a few cells for ignition; therefore, there is no need for the external electric supply, and they are useful in power outages.

These heaters may require an electric supply. When they are used for home, you may the external supply is for ignition and controls. You cannot use these heaters in power outages.

Solar Water Heaters

Solar water heaters are the environmental friendly heaters that do not cause any harm to the environment. These heaters do not require any energy as well except the free energy of the sun. The sun’s energy is renewable as well, so there is no problem of depletion. But these heaters depend on the intensity of the sunlight. They cannot work better in the cloudy days. The more the irradiance level of the sun, the better they work. Further, you can also store the hot water in an insulated tank as well.

Solar water heaters are of many types but the most commonly used heater for the residential purpose is the evacuated tube collector. This type of solar heater is available in the market. There is no running cost of this heater, but the upfront cost is very high.


On the basis of the tank, there are two types of heaters.

  1. With tank heaters
  2. Tankless heaters

With Tank Heaters

These heaters have a tank in which the water is stored and heated. They heat the water slowly and you need to wait for some time. They cannot supply instant hot water. The water in the tank has a limited volume and you can enjoy the hot water until the tank gets empty. Once the tank is empty, then you need to wait for an hour or a few minutes depending on the type of heater. So, these heaters have a limited supply of water.

Further, these heaters take more space due to the tank. They require a large area. These heaters heat the water constantly after turning the heater on. This consumes a lot of energy as well. Therefore, heaters with tanks have more running costs than tankless heaters. These heaters may require a manual start. In a gas heater, you need to ignite the flame with a matchstick or pilot button. While in electric heaters there is no ignition required.

Tankless Heaters

Tankless heaters are very compact, and their installation is easier as well. They do not have any tank and they provide instant hot water for use. The capacity of the instant hot water that a heater can deliver depends on its size and energy output. The water flow of the heater is given in the GPM (gallons per minute). This value can tell you about the volume of water that the heater can provide in a minute. If the value is 4 GPM, then the heater can provide 4 gallons in a minute. The flow rate depends on the difference between the inlet temperature and the outlet temperature. The more the difference the lesser will be the flow rate.

Tankless heaters are common nowadays. There is no risk of tank leakage as well as they don’t have a tank.

Benefits of the Best Electric Water Heater

All types of heaters have their benefits, so we are going to discuss the benefits of the electric water heater. This will help you to know about your best water heater. The important benefits are,

No Ventilation Required

There is no combustion in the electric water heater; therefore, they do not emit any gas. Hence, no ventilation is required. You can save money on the ventilation system. They are no risks of emission of harmful gases at your home and there is no need for the gas detector as well.

No Ignition Required

As there is no combustion in these heaters; therefore, there is no ignition of flame. They only need a wall socket to work.

Easy Installation

These heaters do not require any kind of gas pipe or tank. You just need to insert the plug of the heater in a wall socket and connect the water lines. If there is a special requirement of wiring, then you need to call an electrician for that.


Electric water heaters are very efficient. You can find 99% efficient heaters as well. Almost all the electrical energy is converted to heat energy with minimum losses. The best water heater has good efficiency which saves energy.

Less Upfront Cost

The upfront cost of the electric heaters is usually less than the gas heaters.


As there is no ventilation required; therefore, there is no space required for ventilation. These heaters take less space. You can fit these heaters in an enclosed area as well. No open area or a large area is required.

No Gas Leakage

Electric heaters do not require any gas to work; therefore, they do not have any problem of gas leakage. Gas leakages can be the cause of fire accidents. Electric heaters have a very low risk of fires.

Benefits of Best Natural Gas/Propane Heaters

Natural gas and propane heaters have similar benefits; therefore, we are going to discuss them together. The benefits of these kinds of best water heater are,

Low Running Cost

These heaters use natural gas or propane; therefore, the running cost of these heaters is lesser than the electric heaters. Natural is very cheap and available in almost every home. While propane gas is filled in tanks. Electric heaters consume a lot of electricity and the cost per unit of electricity is also high. Therefore, the overall running cost of the electric heaters is higher than the gas heaters.

Emergency Use

If your heater does not require any kind of external electric supply, then the heater can be used in power outages. They only require the recommended gas to run. Some heaters use batteries for the ignition, and some have manual ignition as well. So, these heaters are suitable for an emergency.

No Wiring Required

Gas heaters do not require any electric supply to generate heat energy. Some heaters may require an electric supply for the purpose of ignition and controlling, but they still don’t require any special wiring. You can save the cost of wiring while using a gas heater.

Automatic Ignition

The automatic ignition in heaters ignites the flame when the hot water is required. There is no need for manual ignition in most of the tankless heaters. This automatic ignition system saves a lot of energy.

Outdoor Use

Some gas heaters are specially designed for outdoor use and you can take them camping and traveling. These heaters are portable, and they have a natural ventilation system as well. So, you can take a portable heater on your next trip.


In this section, we will answer the most common questions about the best water heater. We will divide this section into three parts for Electric, Natural Gas and Propane water heaters.

Electric Water Heaters

Can electric water heater cause a fire?

Electric water heaters have a low probability of causing a fire. They do not have any gas leakage problem and the heating element is perfectly enclosed in the container. Therefore, electric heaters have a lower probability of causing a fire.

Do electric water heaters make noise?

Yes, electric water heaters make a very low humming noise. The noise is due to the passage of current through the heating material. Further, the noise is very low, and it will not disturb your work.

Do electric water heaters have a pilot light?

No, electric water heaters do not have a pilot light. They do not do combustion; therefore, there is no need for a pilot light.

Are electric water heaters efficient?

Yes, electric water heaters are nearly 100% efficient. They convert all electrical energy to heat energy with minimum losses.

Why does electric water heater keep tripping?

The cause of tripping can be a faulty circuit breaker. You should call an electrician to check the circuit breaker. The other cause can be the short circuit in the heating element of the circuit breaker. In this case, you will need to replace the heating element.

Do electric heaters require a ventilation system?

No, electric water heaters do not require any ventilation system. They do not emit gases; therefore, you can save the cost of ventilation.

How does the electric water heater work?

There is a heating element in electric water heaters. This heating element has a very high resistance and on the passage of current, it produces heat energy. The heat energy produced due to current in the heating element is used to heat the water. Electric heaters convert electrical energy to heat energy with minimum losses.

Natural Gas Water Heaters

Can natural gas water heater work on propane?

No, the natural gas water heater cannot work on propane. You should not try any modification in the heater. This can be dangerous to your life. The heaters are specially designed for a particular fuel. If your water heater is designed to use both with a conversion kit, only then you can use it. Otherwise, do not attempt any modification as it is not recommended by the manufacturing companies.

Do natural gas water heaters need electricity?

Some heaters require electricity for ignition and controls. These heaters require electricity, although, they consume only a little amount of electricity. You cannot use these heaters in power outages. While some natural gas heater uses batteries for the ignition; therefore, there is no need for electricity.

Is a natural gas water heater cheaper than electric?

The upfront cost of the natural gas water heaters is more than the electric heaters. While the running cost of the gas heater is much lower than the electric heaters. The cost per unit of electricity is high and it increases the running cost.

Is the efficiency of natural gas heater higher than electric heaters?

No, the efficiency of the natural gas heaters is lower than the electric water heaters. Some of the energy is wasted in the exchanger and some in the exhaust gases. Therefore, the efficiency is lower than the electric heaters.

Propane Heaters

Can propane heaters be used indoors?

Propane heaters are specially designed for indoor or outdoor use. If your propane heater is for indoor use, then you can use it safely indoors. The outdoor propane heater should not be used indoors as they emit certain gases which are harmful to health.

Can propane heaters cause carbon monoxide poisoning?

Outdoor propane heater can cause carbon monoxide poisoning if used indoors. While the indoor propane heaters are safe and they do not emit carbon monoxide.

Can we use a propane heater for outdoor use?

There are some propane heaters that are for outdoor use. You can take them for traveling and camping.

Are propane heaters portable?

Some propane heaters are portable. They don’t even require any external ventilation system. You can also use them at high altitudes.


We need water heaters in the winter season and cold areas. It is a necessity now. There are hundreds of water heaters in the market and it is difficult to choose the best water heater for your needs and requirements. Therefore, in this article, we have listed the best water heater for your guidance. The features, pros, and cons are mentioned separately. This will save you precious time and money. There are various types of heaters as well. We have also explained all the types that will help you to select the best water heater for your requirements.

The Buyer’s Guide in this section will tell you about the features of the heaters. You will get to know about the importance of the features according to your needs. If you will follow the guide carefully, then you will easily get the best water heater. If you are confused with the befits of different kinds of heaters, then you can see our section of the benefits of the best water heater. After getting the best water heater, you should take the precautions as well. The precautions are also given in this article which will ensure the long life and best performance of your heater. We have tried our best and we hope you get the best water heater.

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