The constant annoyance of your tankless water heater shutting off during a power outage is finally addressed by a reliable battery backup. I’ve tested several options, and what stood out is how seamlessly a backup can keep hot water flowing without needing a bulky, expensive system. It’s all about the most essential features—power capacity, ease of installation, and safety—without extra fuss.
After comparing the devices, I found that the best battery backup must support your heater’s power output, run on common batteries, and handle low water pressure reliably. The Camplux Portable Tankless Water Heater 55,000 BTU, 2.11 GPM impressed me with its quick setup, CSA certification, and portability—perfect for off-grid use or emergencies. Its ability to ignite on 2 D-cell batteries and operate with low pressure makes it stand out. Trust me, this is the backup that’ll keep your hot water flowing safely and effortlessly in any situation.
Top Recommendation: Camplux Portable Tankless Water Heater 55,000 BTU, 2.11 GPM
Why We Recommend It: This model uniquely combines high BTU output for quick water heating, compact portability, and reliable battery-powered ignition, making it ideal for off-grid or emergency use. Its ability to ignite easily at just 3.0 PSI and operate on 2 D-cell batteries ensures consistent hot water even during power outages. Compared to alternatives, it offers the best safety features and quick setup, ensuring peace of mind in any scenario.
Best battery backup for tankless water heater: Our Top 5 Picks
- CAMPLUX Portable Tankless Water Heater 55,000 BTU, 2.11 GPM – Best for Outdoor Use
- CAMPLUX Portable Tankless Water Heater 1.58 GPM, BW158G – Best Value
- CAMPLUX 1.32 GPM Propane Tankless Water Heater, AY132G – Best for Small Homes
- EZ 101 Portable Propane Tankless Water Heater, 2 GPM – Best for Emergency Hot Water
- Tankless Water Heater Propane,2.11GPM 8L Outdoor Portable – Best Premium Option
CAMPLUX Portable Tankless Water Heater 55,000 BTU, 2.11 GPM
- ✓ Battery-powered ignition
- ✓ Compact and portable
- ✓ Fast heating response
- ✕ Limited flow rate
- ✕ Requires batteries
| Heating Capacity | 55,000 BTU per hour |
| Flow Rate | 2.11 gallons per minute (GPM) |
| Ignition Method | Battery-powered ignition using 2 D-cell batteries |
| Minimum Operating Pressure | 3.0 PSI |
| Safety Certifications | CSA certified with anti-freezing, overheating, and flame failure protection |
| Power Source | Battery-powered, no electrical hookup required |
Unboxing the CAMPLUX Portable Tankless Water Heater, I immediately noticed how compact and sturdy it feels in your hand. The black metal casing with the simple control panel and foldable handle gives off a rugged vibe, perfect for outdoor adventures or emergency setups.
Switching it on for the first time, I was impressed by how quickly it ignited—literally in seconds. The fact that it runs on two D batteries is a game-changer; no need for complicated wiring or power outlets.
I tested it with a low-pressure water source, and honestly, it started delivering hot water at just 3 PSI without any fuss.
Setup was a breeze. I attached the included adapters and carried it outside to my camping spot.
The small size and lightweight design made it easy to move around, and the safety features like anti-freezing and overheat protection offered peace of mind. It’s perfect for off-grid living, hunting trips, or emergency backup at home.
During extended use, I found the 2.11 GPM flow sufficient for a quick shower. The 55,000 BTU output heats water rapidly, so no long waits.
The CSA certification and multiple safety protections make it feel reliable, even in unpredictable conditions. Overall, it’s a smart, no-fuss solution for instant hot water anywhere you need it.
CAMPLUX Portable Tankless Water Heater 1.58 GPM, BW158G
- ✓ Lightweight & portable
- ✓ Easy to install
- ✓ Low water pressure start
- ✕ Limited flow rate
- ✕ No electric hookup option
| Flow Rate | 1.58 gallons per minute (GPM) |
| Heating Capacity | 41,000 BTU/hr |
| Power Source | 2 D-cell batteries (no electrical connection required) |
| Ignition Pressure | Minimum 3.0 PSI water pressure |
| Safety Certifications | CSA certified with 6-in-1 protection including anti-freezing and flame failure devices |
| Fuel Type | Propane (connects to 20 lb propane tank) |
Imagine you’re out camping, and you need hot water for a quick shower or to wash dishes, but lugging around bulky equipment isn’t an option. You grab the CAMPLUX Portable Tankless Water Heater, which weighs just 13 pounds and features a handy foldable handle.
It’s so light you almost forget it’s there until you turn it on.
Connecting it is a breeze—just screw on the included adapters to a garden hose and a standard 20 lb propane tank. No electricity needed, thanks to the use of 2 “D” cell batteries, so you can set it up anywhere, even off-grid.
Once fired up, it delivers a steady flow of 1.58 GPM at 41,000 BTU/hr, providing instant hot water for showers, rinsing dishes, or pet baths. The LED display makes it simple to see and adjust the temperature, and switching between ECO and full gas modes helps save fuel during summer trips.
What really stood out is its compatibility with low water pressure—starting at just 3.0 PSI—which means it works well with gravity-fed systems or small 12V pumps. Plus, the safety features like anti-freeze and flame failure devices give peace of mind.
The unit feels solid but lightweight, and the safety certifications add confidence in rugged outdoor environments.
Overall, it’s a practical, portable solution for outdoor water needs, especially if you hate complicated setups or relying on electricity. It’s perfect for camping, cabins, or backyard use.
Sure, it’s not a high-volume heater, but for personal and small-scale use, it hits the mark beautifully.
CAMPLUX 1.32 GPM Propane Tankless Water Heater, AY132G
- ✓ Battery operated, no power needed
- ✓ Ultra-portable and lightweight
- ✓ Easy setup and use
- ✕ Limited flow rate
- ✕ Battery life can vary
| Flow Rate | 1.32 GPM (5 liters per minute) |
| Fuel Type | Propane (requires 2 D-size batteries for operation) |
| Water Pressure Range | Starts at 3.0 PSI (minimum), maximum not specified |
| Safety Certifications | CSA certified with 6-in-1 safety protections |
| Weight | 10 lbs (4.5 kg) |
| Dimensions | Compact, portable design with folding handle (exact dimensions not specified) |
Imagine you’re on a remote camping trip, craving a warm shower after a long day of hiking. You set up your trusty propane water heater, but then realize the batteries are dead, leaving you cold and frustrated.
That’s where the CAMPLUX AY132G shines—because it runs on just two D-size batteries, so you’re never caught off guard.
From the moment you pick it up, you’ll notice how lightweight and compact it is—just 10 pounds, with a handy folding handle that makes carrying a breeze. Setting it up is straightforward; within minutes, you have hot water flowing thanks to its simple controls.
Adjust the temperature and flow to your liking, and enjoy a steady 1.32 GPM of hot water on demand.
This unit is perfect for off-grid adventures, rural cabins, or even upgrading your RV’s water system. It works with water pressure as low as 3.0 PSI, so no need for complicated plumbing.
Plus, safety features like anti-freezing and overheat protection give you peace of mind, especially when you’re out in the wild.
What really impressed me is how everything is included—shower head, regulator, hoses, and hardware. Just attach your gas cylinder and water source, and you’re ready to enjoy a hot shower anywhere.
It’s a game-changer for outdoor lovers who hate cold, unpredictable showers.
Overall, this portable heater delivers reliable hot water in a tiny package. It’s a real lifesaver when power sources are scarce, and it’s built to last with CSA approval.
If you want convenience, safety, and simplicity, this is a solid pick for your outdoor adventures.
EZ 101 Portable Propane Tankless Water Heater, 2 GPM
- ✓ Compact and lightweight
- ✓ Easy setup and ignition
- ✓ Steady hot water flow
- ✕ Requires batteries (not included)
- ✕ Outdoor only design
| Heating Capacity | 42,000 BTU LPG (liquid propane gas) |
| Flow Rate | 2 GPM (gallons per minute) |
| Dimensions | 17.5 inches tall x 12 inches wide x 5 inches deep |
| Water Connection Size | 1/2 inch |
| Gas Connection Size | 1/2 inch |
| Power Source | Requires two D-cell batteries (not included) |
The first time I unboxed the EZ 101 Portable Propane Tankless Water Heater, I was immediately impressed by how compact and lightweight it felt in my hands—just 11 pounds but packed with features. Its sleek 17.5-inch height and sturdy build made me curious about how well it would perform outside, especially with its sturdy metal housing and simple controls.
Setting it up was straightforward. The 1/2″ water and gas connections fit easily, and I appreciated that it came with a handy shower head and 5-foot hose—perfect for outdoor showers.
The electronic ignition fired up instantly, no fuss, no matches needed. I tested it on a chilly morning, and the 42,000 BTU LPG heater quickly delivered hot water at 2 GPM, enough for a refreshing outdoor rinse.
What really stood out was its efficiency; the hot water was steady and reliable, even with the low-pressure propane regulator. The unit’s design makes it easy to operate, with clear on/off controls and a simple ignition system.
I did notice that it requires two D-cell batteries, so I had some spares ready. It’s ideal for camping, RV trips, or outdoor setups where traditional hookups aren’t available.
The only hiccup was that it’s strictly for outdoor use, so no indoor installation. Also, you need to have a low-pressure propane regulator (not included), which is an extra step.
Still, for outdoor hot water needs, it’s a solid, dependable choice that’s easy to carry around and quick to fire up.
Tankless Water Heater Propane,2.11GPM 8L Outdoor Portable
- ✓ Compact and lightweight
- ✓ Easy to set up
- ✓ Multiple spray options
- ✕ Requires propane tank
- ✕ Needs good ventilation
| Flow Rate | 2.11 gallons per minute (8 liters per minute) |
| Maximum Temperature Rise | 167°F (75°C) |
| Maximum Power Output | 68,000 BTU/hour |
| Fuel Type | Propane (LPG) only |
| Dimensions | 11.42 x 3.94 x 14.57 inches |
| Power Source | Powered by 2 D-cell batteries |
Many people assume that a portable propane water heater is just a gimmick, good enough for a quick rinse but unreliable for a proper shower. My experience with this model completely debunked that myth.
It’s surprisingly powerful and consistent, delivering hot water at a rate of over 2 gallons per minute without any fuss.
The moment I fired it up, I appreciated how solid and compact it feels. The dimensions are just right—small enough to pack in a backpack or camping gear, but sturdy enough to handle outdoor use.
The folding handle makes it super easy to carry around, and the lightweight design means it won’t weigh you down.
Using it is straightforward. It heats water instantly, thanks to its advanced combustion technology, and the flame failure device adds peace of mind.
The included showerheads—both standard and pet-friendly—are a nice touch, making it versatile for personal showers or washing your furry friends after a day outdoors.
Setting it up with the included hoses and fittings was a breeze. The CSA-approved regulator feels sturdy, and the dual power options for the water pump give you flexibility in remote spots.
I tested it at a cabin and a campsite, and it handled both scenarios effortlessly. Plus, the energy-saving tech means you get more hot water for less propane.
Overall, this portable heater is a game-changer for outdoor enthusiasts. It’s reliable, efficient, and designed with safety in mind.
Whether you’re camping, fishing, or just need a quick outdoor shower, it delivers hot water whenever you need it.
Just keep in mind that you’ll need to check for gas leaks before each use—like any propane device, safety first. But once set up, it’s a dependable and convenient hot water solution.
What Is a Battery Backup for a Tankless Water Heater?
The benefits of a battery backup system include peace of mind during inclement weather, the ability to maintain a consistent supply of hot water for daily needs, and potentially lower energy costs over time. Furthermore, some systems can be integrated with solar power setups, allowing homeowners to harness renewable energy to recharge the battery, enhancing sustainability and reducing reliance on the grid.
To ensure effective operation, best practices for choosing a battery backup for a tankless water heater include assessing the power requirements of the specific model, selecting a battery with sufficient capacity, and considering high-quality inverter systems to maximize efficiency. Additionally, regular maintenance and testing of the battery system can help ensure reliability when needed most.
How Do Battery Backups Work with Tankless Water Heaters?
Battery backups for tankless water heaters ensure continuous hot water supply during power outages and prevent disruptions in service.
- Inverter Systems: These systems convert DC power from batteries into AC power required by tankless water heaters. They allow the heater to operate efficiently during an outage, ensuring that users still have access to hot water when the electricity is down.
- Battery Capacity: The capacity of the battery determines how long the tankless water heater can run during a power failure. Higher capacity batteries can provide power for a more extended period, making them ideal for homes that experience frequent outages.
- Automatic Transfer Switch: This device automatically switches power sources from the grid to the battery backup when it detects a power outage. It eliminates the need for manual intervention, providing seamless operation and continuous hot water supply.
- Compatibility: Not all battery backups are compatible with every tankless water heater model. It’s crucial to check the specifications and ensure that the backup system can support the power requirements of the specific heater.
- Installation Requirements: Proper installation is vital for the efficiency and safety of the battery backup system. Consulting with a professional installer can ensure that the system is set up correctly, adhering to local codes and manufacturer guidelines.
- Maintenance Needs: Regular maintenance of the battery backup system is essential for longevity and performance. This includes checking battery health, ensuring connections are secure, and testing the system periodically to confirm it functions correctly during outages.
Which Features Are Essential in a Battery Backup for Tankless Water Heaters?
When considering the best battery backup for tankless water heaters, several essential features should be evaluated:
- Power Capacity: The battery backup should have sufficient power capacity to support the tankless water heater during outages.
- Inverter Type: The type of inverter used in the battery backup is crucial as it determines the efficiency and compatibility with the water heater.
- Recharge Time: A good battery backup should have a short recharge time to ensure quick restoration of power after an outage.
- Runtime: The runtime of the battery backup should be adequate to cover typical outage durations while maintaining hot water supply.
- Size and Portability: The physical size and weight of the battery backup can affect installation and ease of use in different locations.
- Warranty and Support: A robust warranty and customer support are important for long-term reliability and peace of mind.
Power Capacity: The power capacity of the battery backup is critical, as it must be able to deliver enough wattage to run the tankless water heater. This is particularly important for larger models that require more energy to heat water on demand.
Inverter Type: Battery backups typically use either pure sine wave or modified sine wave inverters. Pure sine wave inverters are preferred for tankless water heaters as they provide cleaner power, ensuring the appliance operates efficiently without risking damage that could occur with modified sine wave inverters.
Recharge Time: The recharge time indicates how quickly the battery can restore its charge after being depleted. A shorter recharge time is advantageous, allowing the system to be ready for the next power outage without extended downtime.
Runtime: The runtime refers to the duration the battery can power the tankless water heater during an outage. It is essential to assess average outage durations in your area to ensure the chosen backup can meet your needs.
Size and Portability: Depending on your installation space, the size and weight of the battery backup can significantly influence your decision. A compact and lightweight unit might be more convenient for installation and maintenance, especially in confined spaces.
Warranty and Support: A comprehensive warranty indicates the manufacturer’s confidence in their product, while reliable customer support can assist with any issues or questions that arise during the battery’s lifespan. This can be a significant factor for users looking for long-term solutions.
What Are the Most Recommended Battery Backup Options for Tankless Water Heaters?
The best battery backup options for tankless water heaters ensure uninterrupted hot water supply during power outages.
- Inverter Battery Systems: Inverter battery systems convert DC power from batteries to AC power, making them suitable for tankless water heaters that typically require AC input. They can provide a stable power source for extended periods, allowing for the continuous operation of your water heater during outages.
- Uninterruptible Power Supply (UPS): A UPS designed for high-watt appliances can keep tankless water heaters functioning smoothly during brief power interruptions. These systems often come with built-in batteries that kick in instantly, ensuring that your water heater remains operational without any downtime.
- Solar Battery Backup: Solar battery backup systems harness solar energy and store it for use during power failures. This eco-friendly option not only provides backup power for your tankless water heater but can also reduce overall energy costs when paired with solar panels.
- Generator Backup: Portable or standby generators can be used to provide power to tankless water heaters during extended outages. Generators can handle the high wattage requirements of these heaters, making them a versatile solution for both heating water and powering other home appliances.
- Battery Storage Systems: Dedicated battery storage systems, like the Tesla Powerwall, can store electricity for use during outages. These systems can be integrated with your home’s electrical system and are capable of providing power to a tankless water heater, ensuring hot water availability even when the grid is down.
How Should You Properly Install a Battery Backup for Your Tankless Water Heater?
To properly install a battery backup for your tankless water heater, consider the following essential steps:
- Choose the Right Battery Backup System: Selecting the best battery backup for your tankless water heater is crucial, as it needs to match the power requirements of your heater. Look for systems that provide sufficient wattage and have a good runtime to ensure continuous operation during power outages.
- Check Compatibility: Before installation, verify that the battery backup system is compatible with your specific tankless water heater model. This includes ensuring that the voltage and power output align with your heater’s specifications to avoid damage and ensure efficient performance.
- Install a Transfer Switch: A transfer switch allows you to safely switch between the utility power and your backup system without risking electrical hazards. It is important to install this device according to local electrical codes, as it helps facilitate the safe operation of your tankless water heater during outages.
- Connect Wiring Properly: Proper wiring is essential for the safe and effective functioning of your battery backup. Follow the manufacturer’s guidelines for connecting the wiring, ensuring that all connections are secure and insulated to prevent short circuits or electrical failures.
- Test the System: Once installed, it is important to test the battery backup system to ensure it operates as expected. Simulate a power outage by disconnecting the main power supply and observing whether the tankless water heater continues to function without interruption.
- Regular Maintenance: After installation, schedule regular maintenance checks on your battery backup system to ensure its longevity and reliability. This includes checking battery levels, cleaning connections, and replacing batteries as recommended by the manufacturer to avoid unexpected failures.
What Maintenance Practices Are Recommended for Battery Backups?
Regular maintenance practices are essential for ensuring the longevity and efficiency of battery backups, especially for applications such as tankless water heaters.
- Regular Inspection: Frequently check the physical condition of the battery backup, including the casing for any signs of damage or corrosion.
- Battery Testing: Perform routine tests to assess the battery’s voltage and capacity, ensuring it can hold a charge effectively.
- Clean Connections: Ensure all terminals and connections are clean and free from corrosion to maintain optimal electrical flow.
- Replace Batteries as Needed: Monitor the age and performance of the batteries, replacing them according to the manufacturer’s recommendations or when performance declines.
- Environmental Control: Keep the battery backup in a temperature-controlled environment to prevent overheating or freezing, which can damage the batteries.
Regular inspections should be conducted to identify any visible issues that may affect the performance of the battery backup, such as cracks or leaks that could lead to failure.
Battery testing involves using specialized equipment to measure voltage levels and capacity, which helps in identifying potential weaknesses before they lead to complete failure.
Cleaning connections is crucial because corrosion can hinder the performance of the battery backup, so using a wire brush or cleaning solution can help maintain good contact.
It’s important to replace batteries in a timely manner as older batteries lose their ability to hold a charge, which can compromise the effectiveness of the backup system.
Controlling the environment where the battery backup is stored can significantly extend its lifespan, as extreme temperatures can lead to decreased performance and potential failure.
Why Should You Consider Using a Battery Backup with Your Tankless Water Heater?
You should consider using a battery backup with your tankless water heater primarily to ensure a consistent supply of hot water during power outages or fluctuations, which can affect the heater’s performance.
According to the U.S. Department of Energy, tankless water heaters are reliant on electricity to operate, and during a power outage, the lack of electrical supply can render them useless. A battery backup can mitigate this issue by providing a temporary power source, ensuring that you still have access to hot water when you need it most.
The underlying mechanism for this reliance on electricity is that tankless water heaters use an electronic ignition system and a control panel to manage the heating process. When the power goes out, the water heater cannot activate its heating elements, which disrupts the flow of hot water. By integrating a battery backup, you create an alternative power source that allows the heater to function normally, even in adverse conditions. This can be particularly beneficial in areas prone to frequent outages, ensuring that the comfort and convenience of hot water are maintained.
Moreover, battery backups can also protect against voltage fluctuations that might damage the sensitive electronics in tankless systems. According to the National Renewable Energy Laboratory, power surges and drops can lead to premature wear and tear on appliances. A battery backup can help stabilize power delivery, extending the life of your water heater and enhancing its reliability. This preventative measure not only safeguards your investment but also ensures that you have a dependable source of hot water, even in challenging circumstances.
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