Upgrading your water heating system? Tankless water heaters offer an efficient, space-saving solution. They heat water on demand and are ideal for homeowners looking to save on space and energy. If you’re searching for easy-to-maintain, energy-efficient tankless water heaters, you’ve come to the right place.

Here are the top 6 picks for 2025. These models combine reliability, performance, and efficiency, so you can make a well-informed decision.

1. Rinnai V65iN Tankless Water Heater

The Rinnai V65iN is a top choice for homeowners seeking an indoor gas-powered tankless water heater. With a flow rate of 6.6 GPM, it provides enough hot water for medium-sized homes. It also offers Wi-Fi compatibility, so you can monitor and adjust settings remotely.

The unit’s high-efficiency rating reduces energy costs, while its self-diagnostic system makes it easier to maintain. This feature alerts you to potential issues before they become costly problems.

2. EcoSmart ECO 27 Electric Tankless Water Heater

If you’re looking for an electric option, consider the EcoSmart ECO 27. This compact unit delivers 27 kW of power and supports multiple faucets at once. With its self-modulating technology, it adjusts power usage based on your needs, providing hot water while keeping energy use low.

Not only is the EcoSmart ECO 27 energy-efficient, but its easy maintenance design ensures long-lasting performance. It’s perfect for homeowners with a large family or high water demand.

3. Navien NPE-240S Gas Tankless Water Heater

The Navien NPE-240S is a condensing gas-powered model that delivers outstanding efficiency. With an energy factor of 0.97, it maximizes fuel usage, reducing costs and minimizing environmental impact. This model also provides a high flow rate of 11.2 GPM, making it ideal for larger households.

Its smart recirculation system helps reduce water wastage, delivering hot water instantly. Additionally, the built-in filtering system reduces mineral buildup, making maintenance a breeze.

4. Stiebel Eltron Tempra Plus 36 kW Tankless Water Heater

Stiebel Eltron is known for premium German engineering, and the Tempra 36 Plus lives up to that reputation. Designed for larger homes, it provides up to 36 kW of power and delivers 8.5 GPM.

The flow control technology ensures consistent water temperature, while the self-modulating system further improves energy efficiency. With its robust performance and easy maintenance, this model is a top contender for those with higher hot water needs.

5. Takagi T-H3-DV-N Tankless Water Heater

The Takagi T-H3-DV-N is a natural gas-powered unit designed for medium to large homes. It offers a flow rate of 10 GPM, perfect for multi-shower households. With energy-efficient condensing technology, it ensures minimal energy loss and maximum performance.

This model features a self-cleaning system to minimize mineral buildup, which reduces the need for frequent maintenance and extends its lifespan.

6. Bosch Tronic 3000 Electric Tankless Water Heater

For smaller homes, the Bosch Tronic 3000 is a great electric tankless water heater option. With a flow rate of 3.5 GPM, it provides reliable hot water in compact spaces. Its durable copper heat exchanger ensures long-lasting use, and it requires little maintenance due to its simple design.

This model is a budget-friendly, energy-efficient choice for apartments or small homes. Its compact size and reliable performance make it ideal for anyone seeking a hassle-free solution.

Factors to Consider When Choosing a Tankless Water Heater

  1. Energy Efficiency: Look for high energy factor (EF) ratings to ensure maximum energy savings.
  2. Flow Rate: Choose a unit that matches your household’s hot water needs. The flow rate (GPM) indicates how much water the heater can supply at once.
  3. Maintenance: Opt for models with self-diagnostic systems or built-in cleaning features. This ensures easier upkeep and a longer lifespan.
  4. Installation Requirements: Some models require specific installations. Check whether your home’s infrastructure can support gas or electric-powered units.

Conclusion

Choosing the best tankless water heaters doesn’t have to be complicated. Consider energy efficiency, maintenance needs, and flow rate when making your decision. The top 6 models listed here offer a combination of cost savings, reliability, and ease of use. Whether you prefer an electric or gas-powered model, these units will provide hot water on demand and help you cut down on energy bills.

Investing in one of these models is a smart choice for anyone looking to upgrade their water heating system while enjoying the benefits of long-term savings and efficient performance.