Game-changer: tankless water heaters that defy the norm – can they run on batteries?

In the realm of modern conveniences, tankless water heaters have emerged as a game-changer, offering endless hot water on demand. However, the question of whether tankless water heaters can be run with battery has often left homeowners and off-grid enthusiasts scratching their heads. This blog post will delve into the nitty-gritty of this topic, exploring the feasibility, limitations, and practical applications of battery-powered tankless water heaters.

Understanding Tankless Water Heaters

Tankless water heaters, unlike traditional storage water heaters, heat water instantly as it flows through the unit. This eliminates the need for a bulky storage tank, saving space and reducing energy consumption. However, their high power requirements pose a unique challenge for off-grid applications.

Feasibility of Battery-Powered Tankless Water Heaters

The simple answer is yes, tankless water heaters can be run with battery. However, it requires a significant investment in high-capacity batteries and a reliable power source to recharge them.

Battery Requirements

The battery capacity required to power a tankless water heater depends on several factors, including the unit’s power rating, flow rate, and desired usage. As a general rule of thumb, a 5-gallon tankless water heater with a power rating of 18 kW would require a battery bank with a capacity of around 300 amp-hours (Ah) at 12 volts.

Power Source Options

Recharging the batteries is crucial for sustainable operation. Off-grid options include:

• Solar panels: Generate electricity from sunlight, providing a clean and renewable power source.
• Wind turbines: Harness the power of wind to generate electricity.
• Generators: Provide a backup power source during periods of low solar or wind energy.

Practical Applications

Battery-powered tankless water heaters are ideal for off-grid cabins, RVs, and remote locations where access to traditional electricity is limited. They offer the convenience of endless hot water on demand without the need for a gas or propane connection.

Limitations

Despite their benefits, battery-powered tankless water heaters have some limitations:

• High initial cost: Batteries and solar panels can be expensive to purchase and install.
• Limited capacity: Battery capacity determines the amount of hot water available before recharging is required.
• Maintenance: Batteries require regular maintenance and replacement, adding to the ongoing costs.

Alternatives to Battery Power

For off-grid applications where battery power is not feasible, alternative methods of heating water include:

• Propane or natural gas: Tankless water heaters designed to run on propane or natural gas are readily available.
• Wood-fired boilers: Provide a renewable and cost-effective way to heat water.
• Solar thermal systems: Use solar panels to convert sunlight into heat, which is then used to warm water.

Summary: Empowering Off-Grid Water Heating

Battery-powered tankless water heaters offer a viable solution for off-grid water heating, providing the convenience of endless hot water on demand. While they require a significant investment and careful planning, they can provide long-term benefits for those seeking self-sufficiency and sustainable living.

Questions We Hear a Lot

Q: Can I use a car battery to power a tankless water heater?
A: No, car batteries are not designed for sustained high-power output and can quickly discharge.

Q: How long can a battery-powered tankless water heater run on a single charge?
A: The runtime depends on the battery capacity, power rating of the unit, and flow rate.

Q: Can I use a battery-powered tankless water heater in an RV?
A: Yes, they are suitable for RVs and other mobile applications where access to traditional electricity is limited.