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10 Best Battery Backups For Tankless Water Heaters Reviewed For 2022

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Tim Rhodes

Due to the very low temperature, we can have during certain seasons in some areas of the globe, the water heater has become an indispensable piece of household equipment in any home.

That’s why having battery backup for tankless water heater is so important because let’s face it, no one likes cold showers.

Instantaneous production models gas appliances made for the best convenience designed without water tanks.

They make it possible to produce hot water on demand without the possibility of storing the heated water in a tank.

One of the drawbacks, when it’s impossible to keep heated water in a tank, is that if there is a power outage or failure they lose all usefulness and you end up with water at an unpleasant temperature.

It is in this lackluster context that having battery backup for tankless water heater comes in handy.

They work as an alternative source of energy and allow the water heater to continue to run sometimes for long hours without utility power.



Last update on 2023-12-16 / Affiliate links / Images from Amazon Product Advertising API

10 Best Battery Backups For Tankless Water Heaters Reviewed

Now let’s get started with our list of the 10 best battery backups for tankless water heaters rated and reviewed.

1. HUGO Battery Backup System for Tankless Water Heaters

HUGO Battery Backup for Tankless Hot Water Heater & Gas Appliances (Plastic Flow Sensor)

The HUGO backup system is at the head of the list as it is the one produced especially for a tankless water heater.

HUGO has a decent battery that can handle up to 13 hours of continuous water usage.

If you’re living in an area with untimely blackouts and you can’t do without hot water, the HUGO’s battery backup is the perfect support to your gas powered tankless water heater as it provides many suitable features.

By its design and structure, the HUGO battery backup system protection gives you the possibility to install it both inside and outside the house.

The casing of the device has a design weather-resistant so that you can install it without fear of rain or other climatic constraints.

It also has a flow sensor that works in such a way that the system only engages if it detects a water flow, which ensures good energy management and sufficient water usage.

The problem with this feature is that the HUGO’s battery backup system cannot be used as a backup for any appliance other than the water heater unless you remove the flow sensor.

It’s designed with a large battery that gives Hugo’s battery, an autonomy of about 13 hours when the power is out.

This product with its automatic switch-over function can automatically switch the water heater from electric power and flow sensor to HUGO battery backup systems and vice versa, and it can act as a portable or permanent clean power source with a standard power rating.

The device and the flow sensor have a temporary or permanent mounting option.

The Hugo battery is also solar capable which means you can connect it to solar panels to collect energy for its operation and for backup.

The built-in fuse and flow sensor to prevent board burnout and protect downstream appliances and the water heater from damage caused by power surges.

The built-in splash-proof battery makes it even safer to install this unit inside your home, by just pulling it into a power outlet.

But the HUGO machine is not totally quiet and when the power goes out you can hear a noise when it is working.

Pros & Benefits:

  • Designed especially for tankless water heaters
  • Great autonomy due to many features
  • Indoor outdoor installation

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2. Ego POWER+ Nexus Portable Power Station

EGO Power+ PST3042 Nexus Portable Power Station for Indoor and Outdoor Use Two 7.5Ah Battery...

If you’re someone who’s highly mobile and portability is important for you, the Ego Power+ is the right choice for you as such as the product is provided with two robust steel handles.

The compact and light structure made it very convenient for outdoor usage as a party or camping and as if that wasn’t enough it’s a weather-resistant construction.

 The Ego Power+ is also usable indoor as it’s easy to store, on furniture, or underneath, and will give you a continuous uninterrupted hot water supply even during a blackout.

The two included batteries give you a very good endurance for a device of this size and the manufacturer assumes that you can rely on the power of his technology to get rid of the noise, the vibrations, and the fumes of a gas powered generator.

There is a LED display incorporated into the engine to show running time to the user by using its temperature sensor.

The Ego Power+ machine is as quiet as possible so that you can use it indoors without being too disturbed in your tranquility. 

Another point is that it has not (unfortunately) an automatic starting system and you need to enable it manually even if the ignition process is rather easy and fast.

The Ego Power+ offers very good connectivity since it proposes the connection by Bluetooth and wi-fi, making it compatible with almost all gas appliances.

The Ego Power may seem expensive if you rely on its size because it has a cost of acquisition that’s pretty high, but we can assure you that they are a very reliable battery backup system.

Pros & Benefits:

  • Mobility, portability, and weather-resistant
  • Good performance and endurance
  • Quieter than a gas powered generator

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3. ROCKPALS 500W Portable Power Station

ROCKPALS Portable Power Station 500W, 505Wh Solar Generator Backup Power Supply with 110V AC Outlet,...

When we come back to the field of mobility the ROCKPALS Power Station is a very good challenger for the Ego Power+ battery backup system solution we have seen before.

One thing that sets it apart from the competition is that, despite its size, it offers an LED display to give the user data on its status and operation and it activates within 8ms upon power outage auto reset when main power becomes available.

Another good reason to acquire this equipment as a backup its versatility for recharging since solar panels can recharge it.

But also by the charging port of your vehicle can recharge the battery, which will protect your hot water source in frigid temperatures.

The ROCKPALS Power Station features a modern design, light and conceived in an easy to carry way since it has a handle.

Although they manufactured it for outdoor use it is not designed to withstand rain and thunderstorms.

Since it was designed for trekking, the Rockpals Power Station’s manufacturer took care to integrate an LED lamp that can send distress signals and protect downstream appliances.

It can also be used indoors, placed on a piece of furniture, or under a table and it offers many options to protect your device against voltage spikes.

The built-in alarm indicator for easy troubleshooting flow sensor switches to prolong battery life only goes off when the battery is low.

If you are looking for a backup battery for the mobile use of your whole house tankless water heaters and that you’re willing to invest more than four hundred dollars, we recommend that you turn to the Rockpals solution which is available at a reasonable price.

Pros & Benefits:

  • Mobility and portability
  • LED display to read running information
  • Many easy ways to charge and recharge

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4. APC Smart-UPS X 2200VA

APC Network UPS, 750VA Smart-UPS Sine Wave UPS with Extended Run Option, SMX750, Tower/2U Rackmount...

This one is an Uninterruptible Power Supply (UPS) manufactured by APC which is well-known for its equipment quality when it comes to the field of battery backup solution brands.

So with a design made purely for indoor installation, it can be rack or tower-mounted and discreetly inserted in adapted wall furniture.

The device is very smart and autonomous in its running both for switching from utility power to backup mode and for clean power management.

The APC Smart-UPS has no displays but a LED notification gives you information on the status and running of the machine and components.

There are many battery loads capacity according to your budget but if you choose one of the most powerful, it provides up to 90 minutes of running for a load of 300 Watts of battery life maintenance.

If you care about your consumption the APC provides you with real data on the kilowatt-hours consumed.

There is also a mode that allows you to reduce the energy allocated to non-essential equipment to give more suitable protection for the most sensitive equipment.

The intuitive interface provides clear information with the ability to configure the inverter locally using easy-to-use navigation keys.

Various parameters are programmable and allow application-specific settings, thresholds, and notifications.

The APC Smart-UPS has also an operating system for remote checking, making it compatible with almost all gas appliances.

The integrated alarm allows you to know the different states of use of the battery and will give you a continuous uninterrupted hot water supply even during a blackout.

The device is not expensive on the acquisition and on the field of maintenance it’s low-cost stuff, highly efficient, and reliable.

Pros & Benefits:

  • Compact design
  • Efficient and reliable
  • Smart and autonomous

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5. Sonnen Batterie Eco 4

Sonnen Batterie Eco 4

Sonnenbatterie Eco is not only an excellent alternative to Hugo’s battery backup but it’s a real innovation.

It is a battery designed in the form of a modern wall cabinet connected to an inverter which in turn absorbs energy from solar panels.

You then supply not only your water heater but also your other gas appliances with clean energy, which will protect your hot water source in frigid temperatures.

The first strong point of this model is its design which is chic and modern and allows it to blend harmoniously with your home furniture to the point of being forgotten.

In conjunction with the Sonnenback-up box, the system makes you completely forget or even fail to notice possible power outages.

The Sonnen Batterie Eco Backup system assures you long hours or even a full day’s autonomy depending on capacity.

The energy management is intelligent and very well-organized.

The collected energy is continuously distributed to power your equipment.

Excess energy stored in the battery becomes useful if there is a blackout so that the Sonnen battery continues to power the house for long hours.

Unlike the Hugo backup, it does not only supply energy to your water heater but to all the electrical equipment in your home and thus becomes a competitor of the generator’s gas powered.

When it comes to the field of mobility although the Sonnen Batterie Eco is not qualified because in spite of its very nice design, moving the system is quite inconvenient.

A final point that is important to highlight is that the cost of acquiring the system is very high.

Pros & Benefits:

  • Stylish design and well-integrated into home furnishings
  • Using clean energy
  • High endurance

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The Generac 7043 is the largest but also one of the most expensive backup brands solution for tankless water heaters that we offer.

If something huge doesn’t annoy you and you can afford it, the GENERAC 7043 incorporates a large battery that not only gives great autonomy for using your water heater but also allows it to support all the large appliances in the house when there is a power outage.

We do, however, note that the manufacturer sells batteries separately which confirms what we said above, it’s a big cost at buying but you will get long-term benefits from it.

The battery charger enables it to recharge when the power is on and the battery lasts up to about 40 hours.

It can also be installed both inside and outside the house but due to its dimensions, we recommend that you install it outside.

As all its components are in a box certified corrosion-resistant aluminum the Generac 7043 can withstand weather variations.

Unlike the HUGO and due to his design, the Generac 7043 has only a permanent mounting option.

It’s a choice of equipment made only if you are looking at a long-term installation.

This is even more justified since to acquire Generac 7043 you will need a budget of more than two thousand dollars.

For those who are looking for a low-noise device, the Generac is also designed and certified to meet this criterion unlike most generators of this size.

And since the manufacturer has connectivity hardware in its case there is also a remote control function that allows the user to control the device operation remotely by a mobile application.

Like most products of its kind, it can also switch over automatically to the backup energy supplier mode.

The multilingual LCD display allows the user to check the operating status of the generator at any time.

Pros & Benefits:

  • High battery power
  • Outdoor installation/resistance to climatic variations
  • Remote control system

7. Tripp Lite OMNIVS

Tripp Lite Omnivs1000 Omnivs Series 1000Va Ups 120V with USB Rj45 8 Outlet Trpomnivs1000

One of the recommended alternatives to the HUGO battery backup is the backup system of TRIPP LITE.

The product with its tower design is only for room installation and unlike other products on the list, it can’t withstand water or climate change.

An interesting feature provides by the design is the wall mounting possibility.

There is no display to read the information on the device status.

Five LEDs arranged on the front panel allows you to have information such as power, battery power, voltage regulation, and battery low status.

The manufacturer promises up to 50 minutes of autonomy with a capacity of an average of 120 Watts.

It is an honorable performance but it’s a long way from the endurance of mostly listed above backup batteries.

But with this alternative power supply time for your equipment after a blackout, you have plenty of time to use hot water and turn off your water heater.

They deliver the device also with an operating system that allows the user to do a remote checking by the mobile application.

The most interesting with Tripp Lite OMNIVS1000 is that you can benefit from these different functions for a cost of fewer than two hundred dollars.

There is a built-in noise suppression function that makes the device quiet even though an audible alarm indicates blackouts.

The body of the device is still not designed for outdoor use and therefore cannot withstand rain or any other weather constraints.

Pros & Benefits:

  • Wall mounting possibility
  • Noise suppression
  • Low budget

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8. CyberPower CP1500AVRLCD


Let us propose to you again an Uninterruptible Power Supply with this time as a first reason, a really affordable price.

CyberPower’s device has a tower design and is so compact that you can easily manipulate it and store it in any room of your house.

When it comes to the field of endurance the CyberPower doesn’t last as long as some of those competitors on the list but when the utility power goes out, it can allow you to take a hot and quick shower before shutting down your water heater.

If you want to make sure your device is working properly, a quick look at its LCD display gives you all the information you need.

The CyberPower is so reliable in protection against power surge that the manufacturer offers an extended warranty to connected equipment if a power surge damaged them.

The connected water heater is also protected against the risk of high voltage thanks to the intelligent voltage regulation system built into the

There’s built-in management software and the UPS runs very quietly.

The built-in audible alarm signal to the user battery mode, low battery, overload, and errors.

You should also notice that the CyberPower CP1500AVRLCD is an Energy Star certified product.

That means for less than two hundred dollars you get a device that helps saving money but also protects the environment.

Pros & Benefits:

  • Compact design
  • Efficient and reliable
  • Low consumption

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9. Ascent Solar Generator Y1200

Ascent Solar Generator Y1200 1.3 Charger Grey Orange Battery Charger (GNY1200GY)

The Ascent Solar Generator Y1200 is a very stylish and extremely practical machine to supply the outage of power so that your water heater operates.

One of its interesting features is that it’s lighter than the average of generators of this kind.

There are two sturdy handles that will allow you to lift it easily when you need to carry it.

Although it’s obviously designed for external use, it can still be used indoors with some domestic equipment.

You also have with the Ascent Solar Generator the advantage of versatility because it offers different output ports to load different types of devices.

Of course, as suggested in its name, the Ascend Solar Generator is compatible with recharging through solar panels.

It is strong enough to power refrigerators, televisions, power boring drills. but also powers boring equipment due to the great power that it generates.

Do not rely on its appearance to underestimate the device because this small block hides a power able to supply your tankless water heater for about 16 hours in the event of a power outage.

The Ascent Solar Generator is very quiet when compared to generators with the same features.

Pros & Benefits:

  • Many outputs possibility
  • Very light and compact
  • Good endurance

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10. Vertiv Liebert GXT4, 2000VA/1800W

Ascent Solar Generator Y1200 1.3 Charger Grey Orange Battery Charger (GNY1200GY)

The purpose of the device is primarily to protect sensitive equipment such as data centers against the consequences of outages and every type of main power disturbance because if the power is out, the ignition system will not operate.

To the extent that it suits your budget, it provides a high-quality continuous power supply with instant transfer to battery power.

For just under a thousand dollars you get a reliable device with the features common to these types of products, such as protecting your water heater from overloads and voltage fluctuations.

Thanks to its small dimensions you can easily store it in your furniture not far from your tankless water heater.

The Vertiv Liebert GXT4’s small size makes it portable even if it’s only suitable for indoor use.

The structure of the device and the arrangement of its components do not allow outdoor usage.

The material of the housing and its structure does not make the Vertiv Liebert GXT4 resistant to elements such as water or climatic attacks.

But if a power failure occurs, you’re sure that you will be able to take one or even two hot showers before you eventually have to turn off the water heater.

Pros & Benefits:

  • Good protection for the equipment
  • Efficiency and good endurance
  • Protection of related equipment

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What Is The Downside Of a Tankless Water Heater?

This list is not meant to expose an exhaustive list of the best backup batteries for your water heater, but a selection of the best based on certain practical criteria.

The endurance criterion has allowed us to select the appliances that will allow you to use your water heater for the longest possible time in case of a power outage.

The criteria of size and mobility as you’re a very mobile person and have a portable water heater makes sense to choose a backup battery system that is also easily movable.

We have also considered battery backup systems that protect your water heater from voltage spikes and overloads.

Final Thoughts

To keep your water heater running if the main blackout happens, there are many options for a backup battery system for tankless water heater available online.

The choice depends essentially on your needs and your preference criteria, be it raw performance, endurance, portability, appearance, or cost.

Finally, as hot water is not the only thing in life, we have also taken into account the various practical functions that these appliances have to offer.

Do you know of any other backup batteries that aren’t on the list?

Feel free to let us know in the comments below.

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