Best Outdoor Tankless Water Heater Reviews 2022 – Perfect for Campers

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Are you planning to switch to the best outdoor tankless water heater? But facing some issues related to space or you don’ want to renovate your home for installing an indoor unit.

Don’t worry; there are plenty of outdoor tankless water heaters of your choice available on market.

The main difference between an indoor and outdoor unit is that an outdoor water heater is installed outside of the home and its ventilation is outside. So, you don’t need to run ventilation pipes through your roof and let gas dispersion inside your home in the case of propane units.

Save your space with smaller units that work efficiently.

Best Outdoor Tankless Water Heater

As we’ve already mentioned about the availability of outdoor units on market, it’s quite difficult to find a good one. Most of the water heaters do not work properly in case of extreme weather conditions.

But for your convenience, we’ve arranged a list of the best outdoor tankless water heaters. Give it a thorough read to know about their features, specifications, advantages, and disadvantages then choose one best meeting your requirements.

#1 . Rinnai RL94EN, 9.8 GPM Tankless Water Heater

rinnai-RL94EN - Best outdoor tankless water heater


  • Rated by Uniform Energy Factor
  • Highly efficient in saving energy
  • Keeps you away from expensive power and water costs
  • Hot water is always ready due to the presence of a recirculation pump
  • Suitcase sized small and compact designed unit is a space saver
  • Lifespan is longer than its other competitive water heaters
  • Wi-Fi monitoring technology
  • Delivers 9.8 gallons per minute of hot water
  • Circ-logic circulation technology
  • Never compromises with Gas pressure

With Rinnai RL you’re never going to run out of hot water that will be available to you 24/7 doesn’t matter how often and how much you need it.

Remarkable Efficiency

The unmatchable efficiency of the Rinnai outdoor tankless water heater can deliver plenty of hot water within minutes without consuming a massive amount of energy.

It can provide water to the most critical areas of your home without harming the perfectly comfortable lifestyle of your family. Laundry, dishes, showering, and bathing, you can get endless hot water wherever you need it.

Ideal Flow Rate

You can easily get 9.8 gallons per minute of hot water with its maximum flow rate while the water consumption of this unit is almost 9.4 gallons. The flow rate varies with the variation in groundwater temperature but the endless supply of water never gets affected.

Circ-logic Technology

Rinnai RL outdoor tankless water heater has advanced Circ-logic technology that allows setting recirculation patterns that are according to your typical daily habits. Recirculation also ensures an instant supply of hot water without making you wait for it.

Smarter & Durable

This water heater lasts longer than other water heaters of such qualities and the energy-saving mode is highly effective that allows delivering hot water only when there is need of it. While the size is small enough to make it fit at any place you find suitable.


  • Weight: 44.2 Pounds
  • Dimensions: 9.6 — 14 — 24.3 inches
  • Voltage: 120 V
  • Energy Factor: 0.82
  • Uniform Energy Factor: 0.81
  • Max. Power Output: 199,000 BTU/Hr
  • Hot water Flow Rate: 9.8 GPM
  • Water Consumption: 9.4 Gallons
  • Water Pressure: 150 PSI
  • Temperature Range: 140 degrees Fahrenheit
  • Battery Needed: No
  • Power Source: Natural Gas
  • Installation Type: Outdoor
  • Wi-Fi capable: Yes
  • Approved by CSA quality management
  • Optional control smart Wi-Fi technology
  • Lasts twice as long
  • Quick access isolation valves
  • Includes recirculation pump
  • Rinna’s warranty process causes troubles.

Used by major hotel chains and several manufacturing facilities this water heater is perfectly easy to maintain and highly recommended by them.

#2 .Rinnai V65EP Propane Tankless water heater



  • Space and energy efficient
  • Advanced enhanced scale detection
  • Optional control smart Wi-Fi technology
  • Delivers 6.5 GPM of hot water
  • Optimal water pressure
  • Qualified by Energy Star
  • 0.82 of energy factor for natural and propane gas
  • Temperature lock setting to prevent accidental temperature change
  • Complies with CSA quality management
  • Can be installed in mobile homes
  • Electronic ignition removes pilot light
  • Ultra-low NOx emission

Rinnai V65EP is an excellent choice for smaller spaces providing a reliable source of hot water including a lock function for temperature setting.

It is capable of delivering 6.5 gallons per minute of hot water making it perfect for one to two bathrooms in your home.

Integrated Temperature Controller

Rinnai V65EP has integrated temperature controllers that can provide adjustable temperature ranges from 120 to 140 degrees Fahrenheit.

You can easily manage and control the temperature to its optimum level with the help of these controllers.

Electronic Ignition

The electronic ignition perfectly removes the need for the pilot light and enhances the chance of saving more energy and fuel without changing the working capacity and functioning of your tankless water heater.

Qualified by Energy Star

The power usage and efficiency of this water heater are certified by Energy Star. While the energy factor of 0.82 is available for propane and natural gas.

This enables the water heater to provide a reliable source of hot water without consuming extra energy and fuel.

Enhanced Scale Detection

With this amazing tankless water heater, you don’t need to worry about any kind of damage because the advanced level enhanced scale detection feature allows it to detect any possibility of damage so you can avoid or make it right on time without risking any life or hazard.

Easy to Install

The process of installation is very easy and does not require hours of work. You can also get assistance from professionals. The unit is the smarter choice for shorter spaces, as it can fit in any smaller space without compromising its output.


  • Weight: 47.4 Pounds
  • Dimensions: 9 — 14 — 23 inches
  • Voltage: 110 V
  • Wattage: 57W
  • Energy Factor: 0.82
  • Max. Power Output: 150,000 BTU/Hr
  • Hot water Flow Rate: 6.5 GPM
  • Water Pressure: 150 PSI
  • Temperature Range:98-140 degrees Fahrenheit
  • Battery Needed: No
  • Ignition Type: Electronic
  • Heating Technology: Non-condensing
  • Power Source: Natural Gas
  • Installation Type: Outdoor only
  • Wi-Fi capable: Yes
  • Temperature lock setting
  • Qualified by Energy Star
  • Enhanced scale detection
  • 150,000 BTU/Hr
  • Non-condensing heating technology
  • No recirculation
  • An isolation valve kit isn’t included

Get an endless supply of hot water with excellent water pressure. Rinnai V65EP is the best built and most reliable outdoor tankless water heater and you can easily depend on it for fulfilling your hot water needs.

#3 . iHeat S-16 Electric Tankless Water Heater



  • 15-20% savings from the hot portion of the electric bill
  • Operates at 99% energy efficiency.
  • 3.7 Gallons of hot water per minute (GPM).
  • 0.77 GPM minimum flow required to activate the unit.
  • 86 TO 140 degrees Fahrenheit output water temperature range.
  • Does not require venting parts.
  • Less expensive to install compared to gas tankless water heaters.
  • Advanced flow control.
  • 3 x 50 A DP min: required breakers.

The iHeat electric tankless water heater has the capacity of heating 3.5 gallons per minute to fulfill needs for a shower, dishwashing, and laundry. This unit is designed to provide hot water at maximum input temperature based on simultaneous use and inlet water temperature.

Stainless Steel Construction

This outdoor tankless water heater has a stainless steel construction that makes it perfect to fit in anywhere for any kind of application including seashore to small boats, resorts, and outdoor kitchens.

Multiple Applications

The iHeat series of water heaters can be used for several sterile applications such as commercial kitchens, clinics, hospitals, and schools where hygiene is of higher priority.

This outdoor heater can be installed anywhere you want to have fun during camping, hiking, and even on road trips.

It can give power to 3-4 bedrooms, including showers, dishwasher, and clothes washer with the help of a heating capacity of 3.5 GPM.

Saves Valuable Space

The small, sleek size and compact design help to save valuable spaces for other purposes and this unit can also be fit under the counter installations.

This unit is smaller enough in comparison to tank-style water heaters that you can install it even inside the closet.

Energy Efficiency

The capability to save 60% on water heating costs makes this electric water heater extraordinary and highly reliable.

The waterproof construction of this unit allows controlling temperature easily and safely with the help of waterproof interactive touchpads to avoid any little cause of the accident.


  • Weight: 8 Pounds
  • Dimensions: 3.5 — 7.7 — 11.5 inches
  • Voltage: 240 V
  • Wattage: 16000 Watts
  • Amperage Capacity: 66 Amps
  • Hot water Flow Rate: 3.5 GPM
  • Water Pressure: 150 PSI
  • Temperature Range: 98-140 degrees Fahrenheit
  • Battery Needed: No
  • Cover: Stainless Steel
  • Power Source: Electric
  • Installation Type: Outdoor only
  • Warranty: 1 year limited, 3-year component 26amp; 5-year leaks
  • Value for money
  • Waterproof interactive touchpad
  • Lead-free certified product
  • Certified by CSA quality management
  • Point-of-use applications
  • Desing needs improvement

The iHeat water heater can produce hot water every time you turn the faucet on and can work flawlessly. This unit fits the bill perfectly and is highly recommended.

#4 .Camplux 2.64 GPM Portable Propane Tankless water heater



  • Liquid propane gas tankless water heater
  • Ideal for camping, horse stables, family vacations, and beach.
  • It can also be installed indoors with the help of a flue pipe.
  • Requires 2 D cell batteries to power
  • Provides 2.64 GPM of hot water with optimum pressure from 2.8-110 PSI.
  • The maximum power output is 68,000 BTU/Hr
  • Compact and light in weight can save 11.5% of energy
  • Saves money by high thermal efficiency of about 88.5%.
  • Includes CSA-approved gas regulators and adapters.
  • Dry combustion protection
  • Flame failure and anti-freeze protection

Get real happiness and enthusiasm by enjoying the outdoor life with the Camplux outdoor tankless water heater. Energy-saving, innovation, and portability are the three important elements of camplux.

Easy Installation

Camplux propane water heater involves the easiest way of installing the unit to get instant hot water that never ends. There are only a few minutes required to warm water for optimal usage.

With its maximum power, you can get 2.64 gallons per minute of hot water quickly while keeping the water pressure within its normal range. If water pressure exceeds 110 PSI the water heater lights up to warn you.

Multiple Safety Features

Multiple protection features ensure your safety at any cost. The flame failure device activates immediately in case of any hazard to mark your safety.

 Anti-freezing protection involves a drain plug to remove residual water to avoid freezing inside the unit.

Overheating protection is present to ensure the safety of your whole home while the system automatically turns off in case of temperature exceeding 167 degrees Fahrenheit.

Highly Efficient

The power efficiency and energy-saving capability with the maximum power output of 68,000 BTU/Hr aids to provide an instant and never-ending supply of hot water while saving 11.5% energy with the help of its advanced technology.

The heat exchanger and main burner include advanced combustion technology that decreases gas consumption and reduces burner noises.


The compact designed unit performs several functions including outdoor showers while camping, bathing horses, and washing dogs.

Give your pets a comfortable and relaxing shower with this perfect model by camplux.

Note: Check gas leakage or improper sealing to avoid any future hazards. Never twine Teflon tape between gas inlet pipe and gas regulator. The water heater can catch fire under such circumstances.

Use brass fittings for connection with torque force of 20-28Nm.


  • Weight: 23.6 Pounds
  • Dimensions: 12.8 — 6.1 — 21.65 inches
  • Voltage: 3 V
  • Wattage:20 KW
  • Max. Power Output: 68,000 BTU/Hr
  • Hot water Flow Rate: 2.64 GPM
  • Water Consumption: 10 Liters Per Flush
  • Water Pressure: 110 PSI
  • Thermal Efficiency: 88.5%
  • Temperature Range: 167 degrees Fahrenheit
  • Battery Needed: 2 D batteries required
  • Battery Life: 180 days
  • Power Source: Battery-powered
  • Installation Type: Outdoor only
  • Dry combustion protection
  • High/Low water pressure protection
  • Overheating/anti-freezing protection
  • Stainless steel burner
  • 10L per flush water consumption
  • No point of use.
  • Flue pipe is not included.

Best for saving energy with so many features of standard protection Camplux propane gas tankless water heater is highly affordable.

#5 . GASLAND BE158B Tankless Water Heater



  • Instant propane outdoor tankless water heater
  • Easy to install
  • Overheating/anti-freeze protection
  • Light in weight with portable design
  • Structured with 11.5% energy-saving technology
  • LED Display screen
  • Water on demand with a maximum power output of 41,000 BTU/Hr
  • Requires low water pressure up to 2.5 PSI
  • Saves money with 88.5% of thermal efficiency
  • Multi-functional shower head

The compact in size Gasland BE158B portable tankless water heater is convenient with several features including anti-freezing protection, overheating protection, and flame failure device to ensure the safety of the whole home.

Energy & Money Saver

Gasland BE158B 1.58 GPM 6L outdoor portable tankless water heater has been structured with 11.5% energy-saving technology.

The exchanger and main burner of this water heater have advanced combustion technology that minimizes the consumption of gas and lowers the burning noise.

I would recommend this unit if you want to save as much energy bill as you can.

Compactness in Design

The compact design and lightweight size make this tankless water heater easy to carry.

Whenever you need hot water it will never disappoint you. This outdoor water heater can be used during camping, on the beach or even you can wash your pets with hot water outdoor.

The mounting bracket of it helps to hang it on the gas water heater. Only a few minutes will be required to install and fix it.


While installing this tankless water heater make sure not to overtighten the connectors and pipes for preventing them from leakage.

Highly Protective for Safety of Family

The anti-freeze protection, overheating protection and flame-failure device all of these features have already been installed in the GASLAND BE158B for the safety of your whole home.

There is the facility to lower water pressure automatically almost in between 2.5-110PSI.

To prevent freezing of water in colder areas the anti-freezing drain plug helps to drain residual water. 

In case of unexpected flameout, the gas supply shuts off automatically. The exhaust can easily get hot when there are some flammable objects present around it. So, try to keep such objects far from the propane tankless water heater.

Overheating protection saves from high water temperatures over 167 degrees Fahrenheit.

Maximum Power Output

The maximum power output of 41,000BTU/Hr helps to get hot water instantly without any shortage doesn’t matter wherever you are. There is no requirement for preheating before usage.

As soon you turn on the water tap, the water will flow out with your desired temperature. It supplies 1.58 gallons of hot water per minute. The heat and water flow are completely adjustable.

Only use liquid propane in a well-ventilated place. Check the water pressure, if it is below 2.5 PSI there will be no ignition in the water heater.

Several Applications

This propane tankless water heater has a number of applications for different purposes. You can enjoy outdoor showers with an unending supply of water on a camping trip.

It provides water on demand, so you don’t need to wait for long to get water of your desired temperature.

It is much better to detect gas leakage first before using it, but keep in mind that never use a flame for leak detection. Some soapy solutions and gas detectors are recommended for this purpose.

You can also give sunbath to your pets such as horses, and dogs.

Note: This gas tankless water heater isn’t suitable in areas with altitudes exceeding 2000 feet and stormy or windy conditions.


  • Weight: 15.53 Pounds
  • Dimensions: 11.8 — 6.1 — 17.3 inches
  • Voltage: 3 V
  • Wattage: 12,000 Watts
  • Size: 6 L
  • Power Source: Battery
  • Batteries: 2 D batteries required
  • Flow Rate: 1.58 GPM
  • Maximum Pressure: 110 PSI
  • Max. Weight Capacity: 10.36 pounds
  • Display: LED
  • Installation Type: Outdoor only
  • Installation Method: Wall-mounted
  • Value for money
  • Temperature Control
  • Tech support
  • High water temperature/pressure protection
  • Overheating/anti-freezing protection
  • Energy-saving knob
  • Best for outdoor usage
  • Batteries are not included.

The enormous features of the GASLAND BE158B tankless water heater make it a highly reliable and affordable water heater with the best value-saving facility.

It is the smart choice for outdoor hot water supply, ideal for camping, and perfect for any place.

#6 . Eccotemp L5 1.5 GPM Portable Tankless Water Heater



  • The legal CSA Approved portable tankless water heater
  • Light in weight, compact, and very easy to carry.
  • Runs smoothly of a standard 20 lbs.
  • Liquid propane with electronic ignition
  • Allows to get hot water on remote locations
  • Can deliver hot water at the rate of 1.5 GPM with low water pressure up to 20 PSI.
  • Adjustable water and gas flow to get desired water temperature.
  • Easy 3 steps setup

The Eccotemp L5 propane tankless water heater is the best and original portable outdoor water heater in the market these days. It is perfect for campsites, cabins, and other outdoor places.

Note: Eccotemp offers a 24/7 self-help desk and live chats to keep your comfort at maximum with hot water. Educated technical support, troubleshooting, and manuals are always there for your convenience.

Smarter Water Heating System

Eccotemp L5 with the EccoFlo of 12V water pump allows getting endless hot water anywhere you need. The flow rate of 1.5 GPM generates hot water with low water pressure that can be up to 20 PSI and the temperature usually ranges from 50-140 degrees Fahrenheit.

Simplified Design

The simple and compact adjustable design, easy-to-use feature, and knobs for gas & water help to maintain the temperature within a comfortable range. Before this, it wasn’t that much easier to adjust temperature and water flow rate.

Portable Convenience

The On/Off switches, accessible drain plugs, and ingoing/outgoing water connections adjusted by adapters make this water heater user-friendly while the supply of hot water is never compromised.

Multiple Applications

This outdoor tankless water heater has many applications. So you can use it for multiple purposes such as

  • Animal washing
  • Emergency preparation
  • Camping
  • Food trucks
  • Hunting
  • Outdoor shower
  • Tiny homes
  • Poolside shower


  • Weight: 11.2 Pound
  • Dimensions: 11.5 — 5.25 — 18 inches
  • Voltage: 3 V
  • Heat Input: 11 kW
  • Temperature Range: 50 to 140 degrees Fahrenheit
  • Batteries Included: No
  • Battery Needed: Yes
  • Power Source: Propane
  • Flow Rate: 1.5 GPM
  • Installation Type: Outdoor
  • Installation Method:Wall Mounted
  • 20% saving on the electricity bill.
  • On/Off shower head.
  • Garden hose adapter.
  • D cell Batteries.
  • Automatically safety shut-off timer.
  • On/Off switch on shower head takes time to turn on/off.
  • Showerhead and flex line needs improvement

cotemp L5 is the best outdoor tankless water heater you’ll ever invest in. It is highly affordable and easy to use.

#7 . Camplux 16L Outdoor Propane Gas Tankless Water Heater



  • Get 4.22 gallons per minute of hot water instantly
  • The low water pressure of 4.0 PSI is perfect for camping u0026amp; remote cabins.
  • Overheat/Anti-freeze protection
  • Flame failure/dry combustion protection
  • High water pressure protection
  • The maximum output power of 110,000 BTU/Hru to deliver endless hot water
  • Saves up to 11.5% energy with its advanced technology
  • Innovative combustion technology with multiple protection systems
  • Great performance with maximum water pressure of 110 PSI
  • 2 D cell batteries are required for ignition

Camplux offers you an easy and reliable outdoor lifestyle with its propane gas tankless water heater that is portable, energy-saving, and innovative in design. It has the capacity to save up to 50% of water heating costs.

Instant Hot Water

Camplux 16L takes only a few minutes to deliver plenty of hot water that is up to 4.22 gallons per minute.

The initial water pressure is 4.0 PSI and can reach a maximum of 110 PSI, so whenever the temperature is between 4-110 PSI, the water heater will light up.

Easy Installation

The easiest installation process will help you to do all its set up within just 5 minutes and surprisingly the unit comes with all necessary accessories. Though it is an outdoor unit, you can also mount it indoors in a well-ventilated area. A flue pipe will be required additionally for this purpose.

6-in-1 Protection

The 6-in-1 protection will make sure to keep in check flame failure, overheating, anti-freezing, low water flow, dry combustion, and high water pressure.

The residual water discharges out via an anti-freezing drain plug so no frozen water is stuck inside the pipes.

Similarly, the gas supply turns off automatically when the water temperature rises from its limited range of over 167 degrees Fahrenheit.

Power & Energy Efficient

The extraordinary power and energy efficiency of the camplux propane water heater offers a maximum power output of 110,000 BTU/Hr and saves energy up to 11.5% with its modernized technology.

The water heater exchanger and main burner are structures with advanced combustion technology to minimize the overconsumption of gas and to avoid unnecessary burning noises.


  • You can’t drink water from this gas tankless water heater.
  • Don’t ever use Teflon tape between gas inlet pipe and gas regulator.
  • Make Sure to check gas leakage before operating the system.
  • Use a torque wrench to connect the gas inlet and gas regulator with brass fitting.


  • Weight: 36 Pounds
  • Dimensions: 17.32 — 7.87 — 27.56 inches
  • Voltage: 3 V
  • Wattage: 32kW
  • Max. Power Output: 110,000 BTU/Hr
  • Flow Rate: 4.22 GPM
  • Thermal Efficiency: 88.5%
  • Temperature Range Max: 167 degrees Fahrenheit
  • Water Pressure: 4.0-110 PSI
  • Battery Needed: 2 D batteries required
  • Power Source: Battery Powered
  • Installation Type: Outdoor/Wall-mounted
  • Innovative combustion technology
  • Advanced multiple protection systems
  • Useful for outdoor showers, bathing horses 26amp; dogs
  • Great performance
  • 88.5% thermal efficiency
  • Batteries are not included
  • No point-of-use

This product is a lifesaver with its great performance. You’re going to be impressed by this little unit in such an affordable price range with wonderful applications. It is recommended.

How to Choose The Top Rated Outdoor Tankless Water Heater -Buying Guide

Tankless water heaters that are installed outside are ideal to save space and their installation is way easier than indoor water heaters.

These water heaters have many other benefits such as you prefer to buy these units if the piping system is bad but drainage is good to some extent and in case of living in a home where pipe blockage is common, an indoor unit won’t work properly. Here is the detailed buying guide that will help you to select a better option.

So, what are the things to keep in mind while going to purchase an outdoor tankless water heater?

Flow Rater/GPM:

GPM is a unit to measure the flow of liquid through the unit at a given temperature. You can calculate it by adding the flow rate of each fixture running at your home that uses hot water.

For example, you run a hot water faucet with a flow rate of almost 0.85 gallons per minute and a shower head with a flow rate of 2.6 gallons per minute. The demand flow rate through a water heater will be 3.45 gallons per minute.

A shower usually uses 2-2.5 GPM, a faucet counter-intuitively uses between 2.1-2.5 GPM and a dishwasher runs at 1 GPM.

The fluid temperature raises between 30 & 40 degrees estimated per GPM on the unit so you need to be more conservative if you’re residing in an area where groundwater is colder 0.5 GPM with 45 degrees rise in temperature.

If your heater heats up to a point where you can’t handle its flow, you’ll end up getting cold bursts that are not appreciated.


Calculating the budget and then deciding accordingly can help a lot in choosing a better option. Most of the standard water heaters cost more than a thousand dollars. So it’d be better if you summarize the whole budget and then search for a tankless water heater that you can afford.

British Thermal Units BTS/Hr:

Knowing about BTUs per hour of product help you to determine whether water is hot enough to handle your needs if you’re living in a cold water area or not.

For your ease here’s a reference: 1 BTU is quite enough to raise 1lb. of water to 1 degree.

One gallon contains 8.3lbs. So 8.3 BTUs will raise the 1-degree temperature of 1 gallon.

As groundwater varies with location, in the lowest case it is about 30 degrees. For a comfy shower, 90 degrees will be sufficient, or maybe you want more let’s to say 115 degrees. To sum up, if you’re a resident of an area where groundwater temperature is 30 degrees, your unit should raise the temperature by 60 degrees at least.

Source of Power:

There are two major types of tankless water heaters: Electric & Propane or natural gas. Both are different from each other and both have specific pros & cons but as per efficiency, electric water heaters are 99% efficient in heat transfer while gas heaters are less.

But situation swaps in colder weather when most electric water heaters lose efficiency while it remains the same in the case of propane water heaters.

Size & Design:

Though just like other units they take space, the space taken by them is less. For sizing you’ve to keep two things in your mind:

  • Building codes of the area where you’re living that apply specifically to apartments in the vicinity of strict practical and legal limits for something you install.
  • Knowing available space so you have proper clearance to avoid something catching fire or overheating. It particularly applies to something you are installing outside, so safety measures matter.

About Fareed Nawaz

Aqua macho was started by Fareed, a renewable energy and clean environment geek who completed his degree in energy and environment in 2017. He has worked in EPA, water heater installation, and water treatment companies for 2 years before starting this website.

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