Expert Review Of Tankless Water Heater And The Ratings: Both Indoor And Outdoor

Looking to shop for the best tankless water heater? It is important to learn the advantages and disadvantages of buying a particular brand of water heater. The tankless water heater is high on demand simply because you can enjoy the supply of hot water whenever needed. When compared to the ordinary water boilers, the tankless heaters are extremely energy efficient that consumes less of power. The hot water storage capacity is also very high here. If you install this sort of water heater in your premise, you will enjoy a steady and continuous supply of hot water all throughout the day, and even the power consumption is not that much.

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Being around for decades, tankless water heater saves space, saves energy and is also an environmentally-friendly option. Indeed, it is better insulated than other kinds of tanks that keep the water hot for a longer period. Unlike storage tank water heater, it does not waste any energy by keeping a tank of water heated all the while, but it heats water only when you need it. It supplies water endlessly to the whole house or business unit at a set temperature till you need it. So, whenever you need hot water, you may install gas powered or electric powered unit to have the supply of hot water. There is no need to use another water pipe for the hot water. Whenever you require hot water, you just turn on the faucet and water starts to pour automatically. It is as simple as that.

With the tankless water heater, you need not waste any energy to heat the water for storage purpose. So, if you are impressed by the benefits of this kind of water heater, you may be looking to own it. As there are several brands, makes and models available in the market, you must refer to this buying guide to learn about the features to look for in the tankless water heater. Know this thing that not all the water heaters can work well for every household. People opt for this kind of water heater because the tankless heating boiler may bring about power savings by up to 5 and 50% if you are buying for the whole house. The energy efficient heater just heats up the water that runs through the system, and so it is much unlike the conventional heaters. So, you will never run out of hot water when using this mode of heating.

Gas Tankless Water Heaters vs. Electric Water Heaters

It is very tough to say which is better. Both kinds of tankless water heater have their strengths and weaknesses. As each household has unique circumstance and so what is good for one neighborhood might not be good for another. Choosing what kind of water heater to buy among so many options is a challenging and critical decision. You need to consider your hot water needs, the installation opportunities, your budget and also personal preferences. You may also get in touch with your plumbing professional to learn about the suitable tankless water heater. Let us check out some pointers suggesting which one is better.

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Electric Tankless Water Heater

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Gas Tankless Water Heaters

Facts On Gas Tankless Water Heater

Electric Tankless Water Heater Facts

The cost of the gas tankless water heater may come around to $1000, and more the features, the more will be its price. It is less expensive, and the cost may be just $500.
The installation cost is high It is easy and less complicated to install
The design is sophisticated, and hence it is expensive. It is smaller and more compact than gas heater
It is more complicated to install As there is no gas combustion, no venting system or ventilation is required.
The home gas line and venting ducts must be compatible with gas tankless water heater It is less complex, and so you may consider its installation after the home is constructed
Operating cost of this heater is less expensive. It is more efficient than other kinds of water heaters. The efficiency score is between 98 and 99%.
If hot water is needed in larger quantity, gas water, the heater is more suitable. So, it may be used in large families. Electrical water heater can deliver 8GPM of hot water
Here the maintenance needed is more than an electric tankless water heater. The mineral scale build-up needs to be cleaned from time to time. It needs very little maintenance. The unit just needs to be flushed once a year
It is meant to last for 20 years but is difficult to service. You will get 10 years of warranty overheat exchanging system and 5 years on various other parts. It is meant to last for more than 20 years and warranty of 5 years may be received on the parts.
It is environment-friendly and energy efficient It is safer for households and energy efficiency is more than gas water heaters. It can move up to 99%.

List of Top Electric Tankless Water Heaters Available In Market At An Affordable Price1)New Ecosmart Green Energy Eco11 11kw Electric Tankless Water Heater 8708695 Available With Patented Self-Modifying Technology


  • Product dimensions: 6.5 x 13.5 x 10 inches
  • Weight: 6.5 pounds
  • Wattage: 13 KW
  • Voltage: 240 volts
  • Capacity: 2 gallons per minute


EcoSmart Electric Tankless Water Heater is mainly suitable for the whole family if the water has a temperature of nearly 67 degrees Fahrenheit. As the heater kind is tankless, it just heats up water flowing through this heater to save on the energy costs. This water heater should be used by a small apartment in some warm place. When you talk about the heating capacity of this tankless water heater, it is 2 gallons water every 2 minutes. Thus, it may handle 1.5 gallons of water in just a minute. Equipped with digital temperature control mechanism, you may increase the temperature by 1 degree Fahrenheit. Such heater may be used in places experiencing cold climate for low flow applications. With the help of this water heater, two sinks may run at a time. When the weather is warm, it may handle two sinks along with the shower. The tankless water heater may also reduce the overall heating cost as it may adjust to the required electricity for heating water. If the area is small, this is the best kind of space saving water heater. It comes equipped with digital temperature control and self-modulating technology.

  •  It is easy to install
  •  It is space saving
  • You may use it in areas experiencing a warm climate
  •  Not meant for a large house
  •  Delay in the flow of water is possible

2) SioGreen IR14K220 POU Infrared Electric Hot Tankless Water Heater. No Corrosion


  • Product dimensions: 18.5 x 3 x 12.5 inches
  • Weight: 13 pounds
  • Wattage: 14 KW
  • Voltage: 220 volts
  • Capacity: 1.5 gallons per minute


This tankless water heater is high on demand as it has an energy efficiency of 99%. SioGreen is the leading manufacturer of tankless water heater. The tankless heating system by this brand is often equipped with the infrared heating element. As it uses top quality high powered quartz and infrared technology, this heating system is much unlike hot metallic technology so much used by other kinds of heaters. It does not only warm the water that comes in contact with the material but also facilitates quick heating. This heater works pretty faster than other water heaters. The best part here is that the technology does not erode or dissolve. Being eco-friendly, the water heater does not allow harmful chemicals such as calcium to come in contact with water. Since water is heated here at a molecular level, this water heater heats water at a faster pace. Simply by installing this water heater, your hot water needs will be completely fulfilled. It is just perfect for a variety of places including kitchen and bathroom. This water heater can maintain a consistent flow of water for shower and may cater to the hot water needs of your entire home. SuperGreen tankless water heater can work for the shower in case room temperature of water reaches 72 degrees Fahrenheit. Make sure the shower head is water saving with the overall capacity of more than 1 gallon.

  •  SuperGreen water heater is more efficient than the other brand of water heaters.
  •  It makes use of highly durable Quartz material
  • For heating water at a quicker pace, there is Infrared Technology
  •  Not meant for showering when the temperature goes below 72 degrees

3)iHeat Tankless S-16 240V 66A 16KW Stainless Steel Enclosure 7.2" by 11" by 3" 1/2"CPT 36' AWG#8 Electric Water Heater


  • Product dimensions: 3.5 x 7.7 x 11.5 inches
  • Weight: 3.9 pounds
  • Wattage: 16 KW
  • Voltage: 240 volts
  • Capacity: 3 gallons per minute


The highly efficient iHeat Tankless Electric Water Heater can heat up to 3 gallons of water per minute. It may handle several usages at the same time if the climate is warmer. This tankless electric water heater is being used widely in parts of the USA like Arizona, Mississippi, Florida, Alabama, and others. In such regions, this tankless water heater may provide hot water to 1 shower, 2 showers and up to 3 sinks, and that too at the same time. But, the total usage needs to be 3 gallons per minute. But, if the climate is cold, you should use it for ‘point-of-use’ application. This is best meant not only for apartments but also for industrial buildings and commercial buildings. This water heater is also suitable for spaces where hygiene is the prime concern like clinics, hospitals, schools, labs. Made up of stainless steel material, you may also use it in resorts, small kitchens, yachts and beachfront properties. Thus it is considered a flexible water tank meant for both indoor and outdoor applications.

iHeat is the brand of water heater known for manufacturing energy saving water heaters. This tankless water heater can save cost by up to 60%. Here the ideal water temperature setting recommended is 120 degrees Fahrenheit.

  • It is compact
  • May be used in a variety of places like hospitals, clinics, and schools. The choice is versatile.
  • Saves a lot of energy
  • Meant for both indoor and outdoor usage
  • Not meant for cold climates

4)Titan N-120 Tankless Water Heater, 220 V, 54 Max Amps


  • Product dimensions: 13.8 x 9.8 x 4.8 inches
  • Weight: 8 pounds
  • Wattage: 11.8 KW
  • Voltage: 220 volts
  • Capacity: 4 gallons per minute


This is an electric tankless water heater manufactured by Titan Company and has the flow rate of minimum 0.5 gallon/minute. It is best meant for warm climates and works well if the water temperature is on par with a room temperature of 65 degrees F. It is capable of providing hot water for 1-2 showers if the place is warm. Even if the setting is kept at low flow, the water heater can serve anyone point quite well.

The flow rate of this tankless water heater is 1 gallon/minute and may give the temperature increase of up to 81 degrees F.  If you increase the flow rate to 4 gallons/minute, the temperature reduces to nearly 20 degrees F. Its power control system is extremely efficient to help optimize the power usage. Hot water may be attained without much energy usage. The presence of an Incoloy heating element in this tankless water heater prevents calcium and mineral deposits inside the heater.

  • It is just perfect for the ones living in warm climate
  • Easy to install water heater requires no venting
  • may suffice the hot water needs of the entire house
  • It may require a frequent maintenance and servicing
  • Not meant for cold weather conditions.

5) Chronomite SR-20L/120 HTR 120-Volt 20-Amp SR Series Instant-Flow Low Flow Tankless Water Heater


  • Product dimensions: 9.6 x 2.8 x 6.2 inches
  • Weight: 4.5 pounds
  • Wattage: 2400 watts
  • Voltage: 120 volts
  • Capacity: 1 gallons per minute


The Chronomite water heater is high on demand because it serves a variety of places. You may use it on bar sinks, kitchen sinks, and even dual lavs. This water heater offers hot water on demand. The tankless water heater comes equipped with patented microprocessor technology, giving hot water in huge quantity in 2 seconds time comparable to what is offered by other water heaters in 6 seconds. As soon as you activate this water heater, it starts giving hot water and continues to give hot water till you want. You may expect to get 1 gallon of hot water in one minute’s time. The best part of choosing this tankless hot water heater is that it is compact and is 99% energy efficient. It efficiently reduces any wastage of power and electricity. This water tank also fulfills the ADA requirements. But, make sure you use it at 208V. The normal flow rate of water is 1.5 gallons/minute and at 208V, it may heat water by 28F if the temperature is normal.

  • The size is compact, small and space saving
  • It is energy efficient
  • The installation cost is low here
  • It gives hot water in just 2 seconds
  • You cannot use it on showers
  • The life reduces when used above 208V

If you are willing to buy gas or propane tankless water heater, you may check this list.1) Camplux 10L Outdoor 2.64GPM Digital Display Portable Propane Gas Tankless Water Heater and Shower by Camplux


  • Product dimensions: 12.9 x 8.3 x 21.6 inches
  • Weight: 18.1 pounds
  • Wattage: 3 KW
  • Voltage: 208 volts
  • Capacity: 2.64 gallons per minute


Camplux Portable Tankless Water Heater is just perfect for the outdoors and is a vision in the very technology of tankless water heaters. This is the revolutionary water heater which is easy to install and setup. You may use it in the outdoor to enjoy hot water shower while you are off for a camping trip. It may also be used to fill up the backyard pool. Having the capacity of 2.6 gallons/minute, this tankless water heater may also help you to save gas when it is summer time. You may adjust the gas usage by using the option of adjustable gas.

Being small, light, compact, the tankless water heater is backed by energy saving technology. Here the brand has used innovation combustive technology with a lot many security features. Its automatic safety feature gets activated within 20 minutes time, and other securities and safety features are flame failure protection feature and anti-freezing protection element. You may easily carry this water heater to a variety of places and use it whenever you want. It operates by using least bit of energy, and this is the greatest advantage.

  • It can save up to 11.5% of energy
  • Equipped with innovation combustion technology
  • It comes equipped with additional safety and security features like fame failure protection, automatic safety device, and anti-freezing protection device.
  • Here you cannot control the flow of water while using the shower handle.

2) Ecotemp L5 Portable Comes With The Outdoor Shower

 Eccotemp Portable Tankless Gas Water Heater:

  • Product dimensions: 14.5 x 11.5 x 4.5 inches
  • Weight: 13.8 pounds
  • Wattage: 11 KW
  • Voltage: 208 volts
  • Capacity: 1.5 gallons per minute


If you were looking to enjoy hot shower bath while you are off for a camping tour, EcoTemp L5 Portable is the only answer. The portable 1.4GPM gas tankless water heater operates on a 2D cell battery. This is easy-to-carry, compact and portable water heater that may easily be set up in the outdoors. You may use it in the farms, recreational vehicles, homes, etc. In one minute, this tankless water heater can provide 2.6 gallons of water. In fact, it may heat water between 80 degree and 145 degrees and shuts down on its own after the period of 20minutes. This water heater may be used as a backup in such areas where there is no electricity supply. So, you may take this heater whenever you go for camping tours in remote areas. The flame of the tankless water heater may ignite with the help of a battery.

The EcoTemp L5 Portable is meant especially for outdoor areas and for recreational purposes. It cannot be fitted perfectly to the plumbing fixture, to the faucets, showers or sinks. If this LPG water heater is not in use, you need to drain off the entire water content.

  • EcoTemp is fabulous for emergency purposes and for outdoors
  •  It shuts down after 20 minutes automatically
  • You need to drain the water when the heater is not in use

3) Eccotemp L10 Portable Outdoor Tankless Water Heater


  • Product dimensions: 8 x 14 x 25.5 inches
  • Weight: 27 pounds
  • Capacity: 2.6 gallons per minute


The area where there is no electricity or has limited power supply, you may use EcoTemp Portable Tankless Gas Water Heater. It is best meant for outdoor areas and recreational purposes. The portable, compact and space-saving tankless water heater is a fabulous way to enjoy shower when you are outdoors. Just after swimming, you may use this shower to wash off the chlorine from your body. Here the speed at which water is delivered is 2.6 gallons/minute. The water of 150 degrees F may be expected from EcoTank L10 Portable Tankless Gas water Heater. It facilitates the use of water simultaneously and features a quick operation. You may also use it on water systems that are modified like on a 12V pump.

Here the most special and useful feature is automatic shut-off timer which implies that the heater will turn off automatically when the water reaches a particular temperature. Being energy efficient, the water heater needs simply Liquid Propane Gas to function.

  • It is best for those places where there is no supply of hot water

  • Automatic shut-off timer is the major perk
  • The feature of cell battery ignition restricts overheating
  • This is not for indoor purpose
  • After usage, you need to drain the water completely



  • Product dimensions: 18 x 7 x 14 inches
  • Weight: 20 pounds
  • Voltage: 3 volts
  • Capacity: 1.6 gallons per minute


Excel Portable Tankless Water Heater is easy to set up and install and comes equipped with magnetic flow sensor technology. The manufacturer of this tankless gas water heater has left no stones unturned to make it as unique as possible. The water heater may also function when the pressure of water is low, and the best part is that it is vent-free. It thus requires no ductwork or flues for installation. Besides, it is equipped with Oxygen Depletion shutoff mechanism whereby the tankless gas water heater automatically shuts off when the oxygen level is low. So, the tank needs to be re-started when there is sufficient oxygen in it.

It is true that Excel Portable Tankless Gas Water Heater may be used at various points, but you should use it at one point only for the maximum performance. The final temperature of the heated water can range between 85 degrees F and 175 degrees F as per the flow rate of water. The incoming water may have the temperature as low as 40 degrees F, but if the flow is reduced, the temperature recommended here is 50 degrees F.

In this tankless water heater, you will also find copper heat exchanger which is usually employed only by the top manufacturers of the water heater. The metal helps in the quick transmission of heat and allows its rapid dispersal. The material is resistant to biofouling and corrosion. It has great fatigue strength, tensile strength, creep rupture strength, great hardness, and yield strength. Excel Portable tankless gas water heater is highly efficient, has a long life and offers much better heating.

  • It works well when the pressure of water is low
  • The feature of Oxygen Depletion Safety shutoff mechanism simply stops the heater once there is insufficient oxygen.
  • It features copper heat exchanger to heat up water efficiently and quickly.
  • You may not be able to use it for multiple points

5) Camp Chef Triton 10l Tankless Gas Water Heater


  • Product dimensions: 16 x 31 x 10 inches
  • Weight: 25 pounds
  • Capacity: 2.6 gallons per minute


This Camp Chef Portable Tankless Gas Water Heater is best meant for outdoors when you are out for a camping trip. You may use it simply to fill the pool with hot water or give your dog a hot water bath. If you need hot water for shower when traveling, use Camp Chef Triton 10L water heater. You simply need to attach a garden hose to enjoy the hot water. Interestingly, it has 4 different settings for the shower head, and they include ‘off,' ‘shower,' ‘mist,' ‘jet.' It is great to learn that the minimum flow of water is 1.1gallon/minute. So, the water temperature can rise by 84 degrees F approximately.

While using this water heater, you need to keep in mind that water needs to be drained after usage. This will save the heater from damage due to water freezing.

  • 4 distinct settings for shower head
  • It may suffice bulk propane tank.
  • Water needs to be drained after usage
  • It tends to blow out when the situation is windy

6) Rinnai V65ep Outdoor Tankless Propane Water Heater


  • Product dimensions: 9 x 14 x 23 inches
  • Weight: 60 pounds
  • Capacity: 5.3 gallons per minute
  • Energy Factor of 0.82
  • Fuel Type: Propane


Rinnai V65EP is an exterior mount gas tankless water heater which offers 6.6 gallons of hot water per minute. So, it can cater to hot water needs of almost half of your family. The simple to install water heater is an ultra-compact unit which allows you to enjoy a continuous supply of hot water. What you get here is dependable and clean hot water at the pre-set temperature. It is an energy efficient water heater which helps to save a lot of floor space.

You will find a feature like a leak detection whereby the tankless water heater detects water leakage and shuts off immediately to prevent any property damage. There is also temperature lock feature which saves the user from unauthorized variation or accidental variation in the temperature of water. The additional scale detection feature in the water heater eliminates the chance of a sudden and long-term breakdown of the tankless water heater.

When it comes to the water capacity of Rinnai V65EP, it delivers hot water up to 6.5 gallons/minute at 35 degrees Fahrenheit temperature rise. So, it is ideal for homes having two bathrooms. You can save a lot of energy expenses and monthly expenses of the water heater. It is best to learn that this water heater will not run out of hot water as such. The tankless water heater comes with extra features like door mounted control for carrying out diagnostics and for controlling temperature.

  • It may be carried to the outdoors
  • It needs no electricity to heat water
  • The water heater is energy efficient
  • It has the leak detection feature
  • It is just apt for 1-2 bathrooms

7) Rinnai Rl94ip Propane Tankless Gas Water Heater


  • Product dimensions: 9.3 x 14 x 23 inches
  • Weight: 26.9 pounds
  • Capacity: 9.4 gallons per minute
  • Energy Factor of .82
  • Fuel Type: Propane


Rinnai RL94iP tankless water heater features energy factor of nearly 82. This water heater is best meant for mobile homes and is certified. It is due to the enhanced scale recognition that the tankless water heater does not break down for a long period. There will not be any unknown variation in temperature as it features temperature lock mechanism. When you are using this water heater, you do not need an external pump as there is no need of recirculation of hot water in the house.

You will also find here leak detector which is again a handy feature. As it functions on natural gas, there is no need for electricity here. The unit shuts off as soon as a leakage is detected. There will be no unauthorized changes in temperature.

  • There is leak detector to detect the leak
  • It saves energy up to 40%
  • Temperature lock feature
  • may be used in the outdoors
  • It is an expensive investment initially

8) Rinnai Rl75en Natural Gas Tankless Water Heater


  • Product dimensions: 9.3 x 14 x 23 inches
  • Weight: 46 pounds
  • Capacity: 7.5 gallons per minute
  • Energy Factor: 0.82
  • Fuel Type: Natural Gas


Rinnai RL75eN is the stylish and compact water heater which may be used in the home by individual users. You may use it in pairs to fulfill your hot water needs. It features heat exchanger of high quality for that optimum persistence. The temperature lock feature saves you from unexpected variation in temperature. Scale detection feature prevents a sudden long-term breakdown of this tankless water heater.

  • It has a compact and stylish design
  • Energy efficient
  • Temperature lock feature
  • can be re-installed
  •  It is mostly meant for 2-3 bathrooms


When compared to conventional storage tank water heater, the tankless water heater is a more popular choice. It is space saving, portable, compact unit that checks your rising energy bills. The tankless water heater eliminates the damage that may result from water leakage. By using it, you may get an unlimited supply of hot water. You may purchase a water heater after considering your budget and determining your hot water needs.